/* Subroutines used for code generation on the Renesas M32R cpu. Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "rtl.h" #include "regs.h" #include "hard-reg-set.h" #include "real.h" #include "insn-config.h" #include "conditions.h" #include "output.h" #include "insn-attr.h" #include "flags.h" #include "expr.h" #include "function.h" #include "recog.h" #include "toplev.h" #include "ggc.h" #include "tm_p.h" #include "target.h" #include "target-def.h" /* Save the operands last given to a compare for use when we generate a scc or bcc insn. */ rtx m32r_compare_op0, m32r_compare_op1; /* Array of valid operand punctuation characters. */ char m32r_punct_chars[256]; /* Selected code model. */ const char * m32r_model_string = M32R_MODEL_DEFAULT; enum m32r_model m32r_model; /* Selected SDA support. */ const char * m32r_sdata_string = M32R_SDATA_DEFAULT; enum m32r_sdata m32r_sdata; /* Machine-specific symbol_ref flags. */ #define SYMBOL_FLAG_MODEL_SHIFT SYMBOL_FLAG_MACH_DEP_SHIFT #define SYMBOL_REF_MODEL(X) \ ((enum m32r_model) ((SYMBOL_REF_FLAGS (X) >> SYMBOL_FLAG_MODEL_SHIFT) & 3)) /* For string literals, etc. */ #define LIT_NAME_P(NAME) ((NAME)[0] == '*' && (NAME)[1] == '.') /* Cache-flush support. Cache-flush is used at trampoline. Default cache-flush is "trap 12". default cache-flush function is "_flush_cache" (CACHE_FLUSH_FUNC) default cache-flush trap-interrupt number is "12". (CACHE_FLUSH_TRAP) You can change how to generate code of cache-flush with following options. -flush-func=FLUSH-FUNC-NAME -no-flush-func -fluch-trap=TRAP-NUMBER -no-flush-trap. */ const char *m32r_cache_flush_func = CACHE_FLUSH_FUNC; const char *m32r_cache_flush_trap_string = CACHE_FLUSH_TRAP; int m32r_cache_flush_trap = 12; /* Forward declaration. */ static void init_reg_tables (void); static void block_move_call (rtx, rtx, rtx); static int m32r_is_insn (rtx); const struct attribute_spec m32r_attribute_table[]; static tree m32r_handle_model_attribute (tree *, tree, tree, int, bool *); static void m32r_output_function_prologue (FILE *, HOST_WIDE_INT); static void m32r_output_function_epilogue (FILE *, HOST_WIDE_INT); static void m32r_file_start (void); static int m32r_adjust_priority (rtx, int); static int m32r_issue_rate (void); static void m32r_encode_section_info (tree, rtx, int); static bool m32r_in_small_data_p (tree); static bool m32r_return_in_memory (tree, tree); static void m32r_setup_incoming_varargs (CUMULATIVE_ARGS *, enum machine_mode, tree, int *, int); static void init_idents (void); static bool m32r_rtx_costs (rtx, int, int, int *); static bool m32r_pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode, tree, bool); /* Initialize the GCC target structure. */ #undef TARGET_ATTRIBUTE_TABLE #define TARGET_ATTRIBUTE_TABLE m32r_attribute_table #undef TARGET_ASM_ALIGNED_HI_OP #define TARGET_ASM_ALIGNED_HI_OP "\t.hword\t" #undef TARGET_ASM_ALIGNED_SI_OP #define TARGET_ASM_ALIGNED_SI_OP "\t.word\t" #undef TARGET_ASM_FUNCTION_PROLOGUE #define TARGET_ASM_FUNCTION_PROLOGUE m32r_output_function_prologue #undef TARGET_ASM_FUNCTION_EPILOGUE #define TARGET_ASM_FUNCTION_EPILOGUE m32r_output_function_epilogue #undef TARGET_ASM_FILE_START #define TARGET_ASM_FILE_START m32r_file_start #undef TARGET_SCHED_ADJUST_PRIORITY #define TARGET_SCHED_ADJUST_PRIORITY m32r_adjust_priority #undef TARGET_SCHED_ISSUE_RATE #define TARGET_SCHED_ISSUE_RATE m32r_issue_rate #undef TARGET_ENCODE_SECTION_INFO #define TARGET_ENCODE_SECTION_INFO m32r_encode_section_info #undef TARGET_IN_SMALL_DATA_P #define TARGET_IN_SMALL_DATA_P m32r_in_small_data_p #undef TARGET_RTX_COSTS #define TARGET_RTX_COSTS m32r_rtx_costs #undef TARGET_ADDRESS_COST #define TARGET_ADDRESS_COST hook_int_rtx_0 #undef TARGET_PROMOTE_PROTOTYPES #define TARGET_PROMOTE_PROTOTYPES hook_bool_tree_true #undef TARGET_RETURN_IN_MEMORY #define TARGET_RETURN_IN_MEMORY m32r_return_in_memory #undef TARGET_SETUP_INCOMING_VARARGS #define TARGET_SETUP_INCOMING_VARARGS m32r_setup_incoming_varargs #undef TARGET_MUST_PASS_IN_STACK #define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size #undef TARGET_PASS_BY_REFERENCE #define TARGET_PASS_BY_REFERENCE m32r_pass_by_reference struct gcc_target targetm = TARGET_INITIALIZER; /* Called by OVERRIDE_OPTIONS to initialize various things. */ void m32r_init (void) { init_reg_tables (); /* Initialize array for PRINT_OPERAND_PUNCT_VALID_P. */ memset (m32r_punct_chars, 0, sizeof (m32r_punct_chars)); m32r_punct_chars['#'] = 1; m32r_punct_chars['@'] = 1; /* ??? no longer used */ /* Provide default value if not specified. */ if (!g_switch_set) g_switch_value = SDATA_DEFAULT_SIZE; if (strcmp (m32r_model_string, "small") == 0) m32r_model = M32R_MODEL_SMALL; else if (strcmp (m32r_model_string, "medium") == 0) m32r_model = M32R_MODEL_MEDIUM; else if (strcmp (m32r_model_string, "large") == 0) m32r_model = M32R_MODEL_LARGE; else error ("bad value (%s) for -mmodel switch", m32r_model_string); if (strcmp (m32r_sdata_string, "none") == 0) m32r_sdata = M32R_SDATA_NONE; else if (strcmp (m32r_sdata_string, "sdata") == 0) m32r_sdata = M32R_SDATA_SDATA; else if (strcmp (m32r_sdata_string, "use") == 0) m32r_sdata = M32R_SDATA_USE; else error ("bad value (%s) for -msdata switch", m32r_sdata_string); if (m32r_cache_flush_trap_string) { /* Change trap-number (12) for cache-flush to the others (0 - 15). */ m32r_cache_flush_trap = atoi (m32r_cache_flush_trap_string); if (m32r_cache_flush_trap < 0 || m32r_cache_flush_trap > 15) error ("bad value (%s) for -flush-trap=n (0= 0 && (unsigned HOST_WIDE_INT) size <= g_switch_value) return true; } } return false; } /* Do anything needed before RTL is emitted for each function. */ void m32r_init_expanders (void) { /* ??? At one point there was code here. The function is left in to make it easy to experiment. */ } /* Acceptable arguments to the call insn. */ int call_address_operand (rtx op, enum machine_mode mode) { return symbolic_operand (op, mode); /* Constants and values in registers are not OK, because the m32r BL instruction can only support PC relative branching. */ } int call_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) != MEM) return 0; op = XEXP (op, 0); return call_address_operand (op, mode); } /* Returns 1 if OP is a symbol reference. */ int symbolic_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { switch (GET_CODE (op)) { case SYMBOL_REF: case LABEL_REF: case CONST : return 1; default: return 0; } } /* Return 1 if OP is a reference to an object in .sdata/.sbss. */ int small_data_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (! TARGET_SDATA_USE) return 0; if (GET_CODE (op) == SYMBOL_REF) return SYMBOL_REF_SMALL_P (op); if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == PLUS && GET_CODE (XEXP (XEXP (op, 0), 0)) == SYMBOL_REF && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT && INT16_P (INTVAL (XEXP (XEXP (op, 0), 1)))) return SYMBOL_REF_SMALL_P (XEXP (XEXP (op, 0), 0)); return 0; } /* Return 1 if OP is a symbol that can use 24 bit addressing. */ int addr24_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { rtx sym; if (flag_pic) return 0; if (GET_CODE (op) == LABEL_REF) return TARGET_ADDR24; if (GET_CODE (op) == SYMBOL_REF) sym = op; else if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == PLUS && GET_CODE (XEXP (XEXP (op, 0), 0)) == SYMBOL_REF && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT && UINT24_P (INTVAL (XEXP (XEXP (op, 0), 1)))) sym = XEXP (XEXP (op, 0), 0); else return 0; if (SYMBOL_REF_MODEL (sym) == M32R_MODEL_SMALL) return 1; if (TARGET_ADDR24 && (CONSTANT_POOL_ADDRESS_P (sym) || LIT_NAME_P (XSTR (sym, 0)))) return 1; return 0; } /* Return 1 if OP is a symbol that needs 32 bit addressing. */ int addr32_operand (rtx op, enum machine_mode mode) { rtx sym; if (GET_CODE (op) == LABEL_REF) return TARGET_ADDR32; if (GET_CODE (op) == SYMBOL_REF) sym = op; else if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == PLUS && GET_CODE (XEXP (XEXP (op, 0), 0)) == SYMBOL_REF && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT && ! flag_pic) sym = XEXP (XEXP (op, 0), 0); else return 0; return (! addr24_operand (sym, mode) && ! small_data_operand (sym, mode)); } /* Return 1 if OP is a function that can be called with the `bl' insn. */ int call26_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (flag_pic) return 1; if (GET_CODE (op) == SYMBOL_REF) return SYMBOL_REF_MODEL (op) != M32R_MODEL_LARGE; return TARGET_CALL26; } /* Returns 1 if OP is an acceptable operand for seth/add3. */ int seth_add3_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (flag_pic) return 0; if (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF) return 1; if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == PLUS && GET_CODE (XEXP (XEXP (op, 0), 0)) == SYMBOL_REF && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT && INT16_P (INTVAL (XEXP (XEXP (op, 0), 1)))) return 1; return 0; } /* Return true if OP is a signed 8 bit immediate value. */ int int8_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) != CONST_INT) return 0; return INT8_P (INTVAL (op)); } /* Return true if OP is a signed 16 bit immediate value useful in comparisons. */ int cmp_int16_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) != CONST_INT) return 0; return CMP_INT16_P (INTVAL (op)); } /* Return true if OP is an unsigned 16 bit immediate value. */ int uint16_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) != CONST_INT) return 0; return UINT16_P (INTVAL (op)); } /* Return true if OP is a register or signed 16 bit value. */ int reg_or_int16_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) == REG || GET_CODE (op) == SUBREG) return register_operand (op, mode); if (GET_CODE (op) != CONST_INT) return 0; return INT16_P (INTVAL (op)); } /* Return true if OP is a register or an unsigned 16 bit value. */ int reg_or_uint16_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) == REG || GET_CODE (op) == SUBREG) return register_operand (op, mode); if (GET_CODE (op) != CONST_INT) return 0; return UINT16_P (INTVAL (op)); } /* Return true if OP is a register or an integer value that can be used is SEQ/SNE. We can use either XOR of the value or ADD of the negative of the value for the constant. Don't allow 0, because that is special cased. */ int reg_or_eq_int16_operand (rtx op, enum machine_mode mode) { HOST_WIDE_INT value; if (GET_CODE (op) == REG || GET_CODE (op) == SUBREG) return register_operand (op, mode); if (GET_CODE (op) != CONST_INT) return 0; value = INTVAL (op); return (value != 0) && (UINT16_P (value) || CMP_INT16_P (-value)); } /* Return true if OP is a register or signed 16 bit value for compares. */ int reg_or_cmp_int16_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) == REG || GET_CODE (op) == SUBREG) return register_operand (op, mode); if (GET_CODE (op) != CONST_INT) return 0; return CMP_INT16_P (INTVAL (op)); } /* Return true if OP is a register or the constant 0. */ int reg_or_zero_operand (rtx op, enum machine_mode mode) { if (GET_CODE (op) == REG || GET_CODE (op) == SUBREG) return register_operand (op, mode); if (GET_CODE (op) != CONST_INT) return 0; return INTVAL (op) == 0; } /* Return true if OP is a const_int requiring two instructions to load. */ int two_insn_const_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) != CONST_INT) return 0; if (INT16_P (INTVAL (op)) || UINT24_P (INTVAL (op)) || UPPER16_P (INTVAL (op))) return 0; return 1; } /* Return true if OP is an acceptable argument for a single word move source. */ int move_src_operand (rtx op, enum machine_mode mode) { switch (GET_CODE (op)) { case LABEL_REF : case SYMBOL_REF : case CONST : return addr24_operand (op, mode); case CONST_INT : /* ??? We allow more cse opportunities if we only allow constants loadable with one insn, and split the rest into two. The instances where this would help should be rare and the current way is simpler. */ if (HOST_BITS_PER_WIDE_INT > 32) { HOST_WIDE_INT rest = INTVAL (op) >> 31; return (rest == 0 || rest == -1); } else return 1; case CONST_DOUBLE : if (mode == SFmode) return 1; else if (mode == SImode) { /* Large unsigned constants are represented as const_double's. */ unsigned HOST_WIDE_INT low, high; low = CONST_DOUBLE_LOW (op); high = CONST_DOUBLE_HIGH (op); return high == 0 && low <= (unsigned) 0xffffffff; } else return 0; case REG : return register_operand (op, mode); case SUBREG : /* (subreg (mem ...) ...) can occur here if the inner part was once a pseudo-reg and is now a stack slot. */ if (GET_CODE (SUBREG_REG (op)) == MEM) return address_operand (XEXP (SUBREG_REG (op), 0), mode); else return register_operand (op, mode); case MEM : if (GET_CODE (XEXP (op, 0)) == PRE_INC || GET_CODE (XEXP (op, 0)) == PRE_DEC) return 0; /* loads can't do pre-{inc,dec} */ return address_operand (XEXP (op, 0), mode); default : return 0; } } /* Return true if OP is an acceptable argument for a double word move source. */ int move_double_src_operand (rtx op, enum machine_mode mode) { switch (GET_CODE (op)) { case CONST_INT : case CONST_DOUBLE : return 1; case REG : return register_operand (op, mode); case SUBREG : /* (subreg (mem ...) ...) can occur here if the inner part was once a pseudo-reg and is now a stack slot. */ if (GET_CODE (SUBREG_REG (op)) == MEM) return move_double_src_operand (SUBREG_REG (op), mode); else return register_operand (op, mode); case MEM : /* Disallow auto inc/dec for now. */ if (GET_CODE (XEXP (op, 0)) == PRE_DEC || GET_CODE (XEXP (op, 0)) == PRE_INC) return 0; return address_operand (XEXP (op, 0), mode); default : return 0; } } /* Return true if OP is an acceptable argument for a move destination. */ int move_dest_operand (rtx op, enum machine_mode mode) { switch (GET_CODE (op)) { case REG : return register_operand (op, mode); case SUBREG : /* (subreg (mem ...) ...) can occur here if the inner part was once a pseudo-reg and is now a stack slot. */ if (GET_CODE (SUBREG_REG (op)) == MEM) return address_operand (XEXP (SUBREG_REG (op), 0), mode); else return register_operand (op, mode); case MEM : if (GET_CODE (XEXP (op, 0)) == POST_INC) return 0; /* stores can't do post inc */ return address_operand (XEXP (op, 0), mode); default : return 0; } } /* Return 1 if OP is a DImode const we want to handle inline. This must match the code in the movdi pattern. It is used by the 'G' CONST_DOUBLE_OK_FOR_LETTER. */ int easy_di_const (rtx op) { rtx high_rtx, low_rtx; HOST_WIDE_INT high, low; split_double (op, &high_rtx, &low_rtx); high = INTVAL (high_rtx); low = INTVAL (low_rtx); /* Pick constants loadable with 2 16 bit `ldi' insns. */ if (high >= -128 && high <= 127 && low >= -128 && low <= 127) return 1; return 0; } /* Return 1 if OP is a DFmode const we want to handle inline. This must match the code in the movdf pattern. It is used by the 'H' CONST_DOUBLE_OK_FOR_LETTER. */ int easy_df_const (rtx op) { REAL_VALUE_TYPE r; long l[2]; REAL_VALUE_FROM_CONST_DOUBLE (r, op); REAL_VALUE_TO_TARGET_DOUBLE (r, l); if (l[0] == 0 && l[1] == 0) return 1; if ((l[0] & 0xffff) == 0 && l[1] == 0) return 1; return 0; } /* Return 1 if OP is an EQ or NE comparison operator. */ int eqne_comparison_operator (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { enum rtx_code code = GET_CODE (op); return (code == EQ || code == NE); } /* Return 1 if OP is a signed comparison operator. */ int signed_comparison_operator (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { enum rtx_code code = GET_CODE (op); return (COMPARISON_P (op) && (code == EQ || code == NE || code == LT || code == LE || code == GT || code == GE)); } /* Return 1 if OP is (mem (reg ...)). This is used in insn length calcs. */ int memreg_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { return GET_CODE (op) == MEM && GET_CODE (XEXP (op, 0)) == REG; } /* Return true if OP is an acceptable input argument for a zero/sign extend operation. */ int extend_operand (rtx op, enum machine_mode mode) { rtx addr; switch (GET_CODE (op)) { case REG : case SUBREG : return register_operand (op, mode); case MEM : addr = XEXP (op, 0); if (GET_CODE (addr) == PRE_INC || GET_CODE (addr) == PRE_DEC) return 0; /* loads can't do pre inc/pre dec */ return address_operand (addr, mode); default : return 0; } } /* Return nonzero if the operand is an insn that is a small insn. Allow const_int 0 as well, which is a placeholder for NOP slots. */ int small_insn_p (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) == CONST_INT && INTVAL (op) == 0) return 1; if (! INSN_P (op)) return 0; return get_attr_length (op) == 2; } /* Return nonzero if the operand is an insn that is a large insn. */ int large_insn_p (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (! INSN_P (op)) return 0; return get_attr_length (op) != 2; } /* Return nonzero if TYPE must be passed by indirect reference. */ static bool m32r_pass_by_reference (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED, enum machine_mode mode, tree type, bool named ATTRIBUTE_UNUSED) { int size; if (type) size = int_size_in_bytes (type); else size = GET_MODE_SIZE (mode); return (size < 0 || size > 8); } /* Comparisons. */ /* X and Y are two things to compare using CODE. Emit the compare insn and return the rtx for compare [arg0 of the if_then_else]. If need_compare is true then the comparison insn must be generated, rather than being subsumed into the following branch instruction. */ rtx gen_compare (enum rtx_code code, rtx x, rtx y, int need_compare) { enum rtx_code compare_code; enum rtx_code branch_code; rtx cc_reg = gen_rtx_REG (CCmode, CARRY_REGNUM); int must_swap = 0; switch (code) { case EQ: compare_code = EQ; branch_code = NE; break; case NE: compare_code = EQ; branch_code = EQ; break; case LT: compare_code = LT; branch_code = NE; break; case LE: compare_code = LT; branch_code = EQ; must_swap = 1; break; case GT: compare_code = LT; branch_code = NE; must_swap = 1; break; case GE: compare_code = LT; branch_code = EQ; break; case LTU: compare_code = LTU; branch_code = NE; break; case LEU: compare_code = LTU; branch_code = EQ; must_swap = 1; break; case GTU: compare_code = LTU; branch_code = NE; must_swap = 1; break; case GEU: compare_code = LTU; branch_code = EQ; break; default: abort (); } if (need_compare) { switch (compare_code) { case EQ: if (GET_CODE (y) == CONST_INT && CMP_INT16_P (INTVAL (y)) /* Reg equal to small const. */ && y != const0_rtx) { rtx tmp = gen_reg_rtx (SImode); emit_insn (gen_addsi3 (tmp, x, GEN_INT (-INTVAL (y)))); x = tmp; y = const0_rtx; } else if (CONSTANT_P (y)) /* Reg equal to const. */ { rtx tmp = force_reg (GET_MODE (x), y); y = tmp; } if (register_operand (y, SImode) /* Reg equal to reg. */ || y == const0_rtx) /* Reg equal to zero. */ { emit_insn (gen_cmp_eqsi_insn (x, y)); return gen_rtx_fmt_ee (code, CCmode, cc_reg, const0_rtx); } break; case LT: if (register_operand (y, SImode) || (GET_CODE (y) == CONST_INT && CMP_INT16_P (INTVAL (y)))) { rtx tmp = gen_reg_rtx (SImode); /* Reg compared to reg. */ switch (code) { case LT: emit_insn (gen_cmp_ltsi_insn (x, y)); code = EQ; break; case LE: if (y == const0_rtx) tmp = const1_rtx; else emit_insn (gen_addsi3 (tmp, y, constm1_rtx)); emit_insn (gen_cmp_ltsi_insn (x, tmp)); code = EQ; break; case GT: if (GET_CODE (y) == CONST_INT) tmp = gen_rtx_PLUS (SImode, y, const1_rtx); else emit_insn (gen_addsi3 (tmp, y, constm1_rtx)); emit_insn (gen_cmp_ltsi_insn (x, tmp)); code = NE; break; case GE: emit_insn (gen_cmp_ltsi_insn (x, y)); code = NE; break; default: abort (); } return gen_rtx_fmt_ee (code, CCmode, cc_reg, const0_rtx); } break; case LTU: if (register_operand (y, SImode) || (GET_CODE (y) == CONST_INT && CMP_INT16_P (INTVAL (y)))) { rtx tmp = gen_reg_rtx (SImode); /* Reg (unsigned) compared to reg. */ switch (code) { case LTU: emit_insn (gen_cmp_ltusi_insn (x, y)); code = EQ; break; case LEU: if (y == const0_rtx) tmp = const1_rtx; else emit_insn (gen_addsi3 (tmp, y, constm1_rtx)); emit_insn (gen_cmp_ltusi_insn (x, tmp)); code = EQ; break; case GTU: if (GET_CODE (y) == CONST_INT) tmp = gen_rtx_PLUS (SImode, y, const1_rtx); else emit_insn (gen_addsi3 (tmp, y, constm1_rtx)); emit_insn (gen_cmp_ltusi_insn (x, tmp)); code = NE; break; case GEU: emit_insn (gen_cmp_ltusi_insn (x, y)); code = NE; break; default: abort(); } return gen_rtx_fmt_ee (code, CCmode, cc_reg, const0_rtx); } break; default: abort(); } } else { /* Reg/reg equal comparison. */ if (compare_code == EQ && register_operand (y, SImode)) return gen_rtx_fmt_ee (code, CCmode, x, y); /* Reg/zero signed comparison. */ if ((compare_code == EQ || compare_code == LT) && y == const0_rtx) return gen_rtx_fmt_ee (code, CCmode, x, y); /* Reg/smallconst equal comparison. */ if (compare_code == EQ && GET_CODE (y) == CONST_INT && CMP_INT16_P (INTVAL (y))) { rtx tmp = gen_reg_rtx (SImode); emit_insn (gen_addsi3 (tmp, x, GEN_INT (-INTVAL (y)))); return gen_rtx_fmt_ee (code, CCmode, tmp, const0_rtx); } /* Reg/const equal comparison. */ if (compare_code == EQ && CONSTANT_P (y)) { rtx tmp = force_reg (GET_MODE (x), y); return gen_rtx_fmt_ee (code, CCmode, x, tmp); } } if (CONSTANT_P (y)) { if (must_swap) y = force_reg (GET_MODE (x), y); else { int ok_const = (code == LTU || code == LEU || code == GTU || code == GEU) ? uint16_operand (y, GET_MODE (y)) : reg_or_cmp_int16_operand (y, GET_MODE (y)); if (! ok_const) y = force_reg (GET_MODE (x), y); } } switch (compare_code) { case EQ : emit_insn (gen_cmp_eqsi_insn (must_swap ? y : x, must_swap ? x : y)); break; case LT : emit_insn (gen_cmp_ltsi_insn (must_swap ? y : x, must_swap ? x : y)); break; case LTU : emit_insn (gen_cmp_ltusi_insn (must_swap ? y : x, must_swap ? x : y)); break; default: abort (); } return gen_rtx_fmt_ee (branch_code, VOIDmode, cc_reg, CONST0_RTX (CCmode)); } /* Split a 2 word move (DI or DF) into component parts. */ rtx gen_split_move_double (rtx operands[]) { enum machine_mode mode = GET_MODE (operands[0]); rtx dest = operands[0]; rtx src = operands[1]; rtx val; /* We might have (SUBREG (MEM)) here, so just get rid of the subregs to make this code simpler. It is safe to call alter_subreg any time after reload. */ if (GET_CODE (dest) == SUBREG) alter_subreg (&dest); if (GET_CODE (src) == SUBREG) alter_subreg (&src); start_sequence (); if (GET_CODE (dest) == REG) { int dregno = REGNO (dest); /* Reg = reg. */ if (GET_CODE (src) == REG) { int sregno = REGNO (src); int reverse = (dregno == sregno + 1); /* We normally copy the low-numbered register first. However, if the first register operand 0 is the same as the second register of operand 1, we must copy in the opposite order. */ emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, reverse, TRUE, mode), operand_subword (src, reverse, TRUE, mode))); emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, !reverse, TRUE, mode), operand_subword (src, !reverse, TRUE, mode))); } /* Reg = constant. */ else if (GET_CODE (src) == CONST_INT || GET_CODE (src) == CONST_DOUBLE) { rtx words[2]; split_double (src, &words[0], &words[1]); emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, 0, TRUE, mode), words[0])); emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, 1, TRUE, mode), words[1])); } /* Reg = mem. */ else if (GET_CODE (src) == MEM) { /* If the high-address word is used in the address, we must load it last. Otherwise, load it first. */ int reverse = (refers_to_regno_p (dregno, dregno + 1, XEXP (src, 0), 0) != 0); /* We used to optimize loads from single registers as ld r1,r3+; ld r2,r3 if r3 were not used subsequently. However, the REG_NOTES aren't propagated correctly by the reload phase, and it can cause bad code to be generated. We could still try: ld r1,r3+; ld r2,r3; addi r3,-4 which saves 2 bytes and doesn't force longword alignment. */ emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, reverse, TRUE, mode), adjust_address (src, SImode, reverse * UNITS_PER_WORD))); emit_insn (gen_rtx_SET (VOIDmode, operand_subword (dest, !reverse, TRUE, mode), adjust_address (src, SImode, !reverse * UNITS_PER_WORD))); } else abort (); } /* Mem = reg. */ /* We used to optimize loads from single registers as st r1,r3; st r2,+r3 if r3 were not used subsequently. However, the REG_NOTES aren't propagated correctly by the reload phase, and it can cause bad code to be generated. We could still try: st r1,r3; st r2,+r3; addi r3,-4 which saves 2 bytes and doesn't force longword alignment. */ else if (GET_CODE (dest) == MEM && GET_CODE (src) == REG) { emit_insn (gen_rtx_SET (VOIDmode, adjust_address (dest, SImode, 0), operand_subword (src, 0, TRUE, mode))); emit_insn (gen_rtx_SET (VOIDmode, adjust_address (dest, SImode, UNITS_PER_WORD), operand_subword (src, 1, TRUE, mode))); } else abort (); val = get_insns (); end_sequence (); return val; } /* Implements the FUNCTION_ARG_PARTIAL_NREGS macro. */ int function_arg_partial_nregs (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, int named ATTRIBUTE_UNUSED) { int ret; unsigned int size = (((mode == BLKmode && type) ? (unsigned int) int_size_in_bytes (type) : GET_MODE_SIZE (mode)) + UNITS_PER_WORD - 1) / UNITS_PER_WORD; if (*cum >= M32R_MAX_PARM_REGS) ret = 0; else if (*cum + size > M32R_MAX_PARM_REGS) ret = (*cum + size) - M32R_MAX_PARM_REGS; else ret = 0; return ret; } /* Worker function for TARGET_RETURN_IN_MEMORY. */ static bool m32r_return_in_memory (tree type, tree fntype ATTRIBUTE_UNUSED) { return m32r_pass_by_reference (NULL, TYPE_MODE (type), type, false); } /* Do any needed setup for a variadic function. For the M32R, we must create a register parameter block, and then copy any anonymous arguments in registers to memory. CUM has not been updated for the last named argument which has type TYPE and mode MODE, and we rely on this fact. */ static void m32r_setup_incoming_varargs (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type, int *pretend_size, int no_rtl) { int first_anon_arg; if (no_rtl) return; /* All BLKmode values are passed by reference. */ if (mode == BLKmode) abort (); first_anon_arg = (ROUND_ADVANCE_CUM (*cum, mode, type) + ROUND_ADVANCE_ARG (mode, type)); if (first_anon_arg < M32R_MAX_PARM_REGS) { /* Note that first_reg_offset < M32R_MAX_PARM_REGS. */ int first_reg_offset = first_anon_arg; /* Size in words to "pretend" allocate. */ int size = M32R_MAX_PARM_REGS - first_reg_offset; rtx regblock; regblock = gen_rtx_MEM (BLKmode, plus_constant (arg_pointer_rtx, FIRST_PARM_OFFSET (0))); set_mem_alias_set (regblock, get_varargs_alias_set ()); move_block_from_reg (first_reg_offset, regblock, size); *pretend_size = (size * UNITS_PER_WORD); } } /* Return true if INSN is real instruction bearing insn. */ static int m32r_is_insn (rtx insn) { return (INSN_P (insn) && GET_CODE (PATTERN (insn)) != USE && GET_CODE (PATTERN (insn)) != CLOBBER && GET_CODE (PATTERN (insn)) != ADDR_VEC); } /* Increase the priority of long instructions so that the short instructions are scheduled ahead of the long ones. */ static int m32r_adjust_priority (rtx insn, int priority) { if (m32r_is_insn (insn) && get_attr_insn_size (insn) != INSN_SIZE_SHORT) priority <<= 3; return priority; } /* Indicate how many instructions can be issued at the same time. This is sort of a lie. The m32r can issue only 1 long insn at once, but it can issue 2 short insns. The default therefore is set at 2, but this can be overridden by the command line option -missue-rate=1. */ static int m32r_issue_rate (void) { return ((TARGET_LOW_ISSUE_RATE) ? 1 : 2); } /* Cost functions. */ static bool m32r_rtx_costs (rtx x, int code, int outer_code ATTRIBUTE_UNUSED, int *total) { switch (code) { /* Small integers are as cheap as registers. 4 byte values can be fetched as immediate constants - let's give that the cost of an extra insn. */ case CONST_INT: if (INT16_P (INTVAL (x))) { *total = 0; return true; } /* FALLTHRU */ case CONST: case LABEL_REF: case SYMBOL_REF: *total = COSTS_N_INSNS (1); return true; case CONST_DOUBLE: { rtx high, low; split_double (x, &high, &low); *total = COSTS_N_INSNS (!INT16_P (INTVAL (high)) + !INT16_P (INTVAL (low))); return true; } case MULT: *total = COSTS_N_INSNS (3); return true; case DIV: case UDIV: case MOD: case UMOD: *total = COSTS_N_INSNS (10); return true; default: return false; } } /* Type of function DECL. The result is cached. To reset the cache at the end of a function, call with DECL = NULL_TREE. */ enum m32r_function_type m32r_compute_function_type (tree decl) { /* Cached value. */ static enum m32r_function_type fn_type = M32R_FUNCTION_UNKNOWN; /* Last function we were called for. */ static tree last_fn = NULL_TREE; /* Resetting the cached value? */ if (decl == NULL_TREE) { fn_type = M32R_FUNCTION_UNKNOWN; last_fn = NULL_TREE; return fn_type; } if (decl == last_fn && fn_type != M32R_FUNCTION_UNKNOWN) return fn_type; /* Compute function type. */ fn_type = (lookup_attribute ("interrupt", DECL_ATTRIBUTES (current_function_decl)) != NULL_TREE ? M32R_FUNCTION_INTERRUPT : M32R_FUNCTION_NORMAL); last_fn = decl; return fn_type; } /* Function prologue/epilogue handlers. */ /* M32R stack frames look like: Before call After call +-----------------------+ +-----------------------+ | | | | high | local variables, | | local variables, | mem | reg save area, etc. | | reg save area, etc. | | | | | +-----------------------+ +-----------------------+ | | | | | arguments on stack. | | arguments on stack. | | | | | SP+0->+-----------------------+ +-----------------------+ | reg parm save area, | | only created for | | variable argument | | functions | +-----------------------+ | previous frame ptr | +-----------------------+ | | | register save area | | | +-----------------------+ | return address | +-----------------------+ | | | local variables | | | +-----------------------+ | | | alloca allocations | | | +-----------------------+ | | low | arguments on stack | memory | | SP+0->+-----------------------+ Notes: 1) The "reg parm save area" does not exist for non variable argument fns. 2) The "reg parm save area" can be eliminated completely if we saved regs containing anonymous args separately but that complicates things too much (so it's not done). 3) The return address is saved after the register save area so as to have as many insns as possible between the restoration of `lr' and the `jmp lr'. */ /* Structure to be filled in by m32r_compute_frame_size with register save masks, and offsets for the current function. */ struct m32r_frame_info { unsigned int total_size; /* # bytes that the entire frame takes up. */ unsigned int extra_size; /* # bytes of extra stuff. */ unsigned int pretend_size; /* # bytes we push and pretend caller did. */ unsigned int args_size; /* # bytes that outgoing arguments take up. */ unsigned int reg_size; /* # bytes needed to store regs. */ unsigned int var_size; /* # bytes that variables take up. */ unsigned int gmask; /* Mask of saved gp registers. */ unsigned int save_fp; /* Nonzero if fp must be saved. */ unsigned int save_lr; /* Nonzero if lr (return addr) must be saved. */ int initialized; /* Nonzero if frame size already calculated. */ }; /* Current frame information calculated by m32r_compute_frame_size. */ static struct m32r_frame_info current_frame_info; /* Zero structure to initialize current_frame_info. */ static struct m32r_frame_info zero_frame_info; #define FRAME_POINTER_MASK (1 << (FRAME_POINTER_REGNUM)) #define RETURN_ADDR_MASK (1 << (RETURN_ADDR_REGNUM)) /* Tell prologue and epilogue if register REGNO should be saved / restored. The return address and frame pointer are treated separately. Don't consider them here. */ #define MUST_SAVE_REGISTER(regno, interrupt_p) \ ((regno) != RETURN_ADDR_REGNUM && (regno) != FRAME_POINTER_REGNUM \ && (regs_ever_live[regno] && (!call_used_regs[regno] || interrupt_p))) #define MUST_SAVE_FRAME_POINTER (regs_ever_live[FRAME_POINTER_REGNUM]) #define MUST_SAVE_RETURN_ADDR (regs_ever_live[RETURN_ADDR_REGNUM] || current_function_profile) #define SHORT_INSN_SIZE 2 /* Size of small instructions. */ #define LONG_INSN_SIZE 4 /* Size of long instructions. */ /* Return the bytes needed to compute the frame pointer from the current stack pointer. SIZE is the size needed for local variables. */ unsigned int m32r_compute_frame_size (int size) /* # of var. bytes allocated. */ { int regno; unsigned int total_size, var_size, args_size, pretend_size, extra_size; unsigned int reg_size, frame_size; unsigned int gmask; enum m32r_function_type fn_type; int interrupt_p; int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table); var_size = M32R_STACK_ALIGN (size); args_size = M32R_STACK_ALIGN (current_function_outgoing_args_size); pretend_size = current_function_pretend_args_size; extra_size = FIRST_PARM_OFFSET (0); total_size = extra_size + pretend_size + args_size + var_size; reg_size = 0; gmask = 0; /* See if this is an interrupt handler. Call used registers must be saved for them too. */ fn_type = m32r_compute_function_type (current_function_decl); interrupt_p = M32R_INTERRUPT_P (fn_type); /* Calculate space needed for registers. */ for (regno = 0; regno < M32R_MAX_INT_REGS; regno++) { if (MUST_SAVE_REGISTER (regno, interrupt_p) || (regno == PIC_OFFSET_TABLE_REGNUM && pic_reg_used)) { reg_size += UNITS_PER_WORD; gmask |= 1 << regno; } } current_frame_info.save_fp = MUST_SAVE_FRAME_POINTER; current_frame_info.save_lr = MUST_SAVE_RETURN_ADDR || pic_reg_used; reg_size += ((current_frame_info.save_fp + current_frame_info.save_lr) * UNITS_PER_WORD); total_size += reg_size; /* ??? Not sure this is necessary, and I don't think the epilogue handler will do the right thing if this changes total_size. */ total_size = M32R_STACK_ALIGN (total_size); frame_size = total_size - (pretend_size + reg_size); /* Save computed information. */ current_frame_info.total_size = total_size; current_frame_info.extra_size = extra_size; current_frame_info.pretend_size = pretend_size; current_frame_info.var_size = var_size; current_frame_info.args_size = args_size; current_frame_info.reg_size = reg_size; current_frame_info.gmask = gmask; current_frame_info.initialized = reload_completed; /* Ok, we're done. */ return total_size; } /* The table we use to reference PIC data. */ static rtx global_offset_table; static void m32r_reload_lr (rtx sp, int size) { rtx lr = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM); if (size == 0) emit_insn (gen_movsi (lr, gen_rtx_MEM (Pmode, sp))); else if (size <= 32768) emit_insn (gen_movsi (lr, gen_rtx_MEM (Pmode, gen_rtx_PLUS (Pmode, sp, GEN_INT (size))))); else { rtx tmp = gen_rtx_REG (Pmode, PROLOGUE_TMP_REGNUM); emit_insn (gen_movsi (tmp, GEN_INT (size))); emit_insn (gen_addsi3 (tmp, tmp, sp)); emit_insn (gen_movsi (lr, gen_rtx_MEM (Pmode, tmp))); } emit_insn (gen_rtx_USE (VOIDmode, lr)); } void m32r_load_pic_register (void) { global_offset_table = gen_rtx_SYMBOL_REF (Pmode, "_GLOBAL_OFFSET_TABLE_"); emit_insn (gen_get_pc (pic_offset_table_rtx, global_offset_table, GEN_INT (TARGET_MODEL_SMALL))); /* Need to emit this whether or not we obey regdecls, since setjmp/longjmp can cause life info to screw up. */ emit_insn (gen_rtx_USE (VOIDmode, pic_offset_table_rtx)); } /* Expand the m32r prologue as a series of insns. */ void m32r_expand_prologue (void) { int regno; int frame_size; unsigned int gmask; int pic_reg_used = flag_pic && (current_function_uses_pic_offset_table); if (! current_frame_info.initialized) m32r_compute_frame_size (get_frame_size ()); gmask = current_frame_info.gmask; /* These cases shouldn't happen. Catch them now. */ if (current_frame_info.total_size == 0 && gmask) abort (); /* Allocate space for register arguments if this is a variadic function. */ if (current_frame_info.pretend_size != 0) { /* Use a HOST_WIDE_INT temporary, since negating an unsigned int gives the wrong result on a 64-bit host. */ HOST_WIDE_INT pretend_size = current_frame_info.pretend_size; emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (-pretend_size))); } /* Save any registers we need to and set up fp. */ if (current_frame_info.save_fp) emit_insn (gen_movsi_push (stack_pointer_rtx, frame_pointer_rtx)); gmask &= ~(FRAME_POINTER_MASK | RETURN_ADDR_MASK); /* Save any needed call-saved regs (and call-used if this is an interrupt handler). */ for (regno = 0; regno <= M32R_MAX_INT_REGS; ++regno) { if ((gmask & (1 << regno)) != 0) emit_insn (gen_movsi_push (stack_pointer_rtx, gen_rtx_REG (Pmode, regno))); } if (current_frame_info.save_lr) emit_insn (gen_movsi_push (stack_pointer_rtx, gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM))); /* Allocate the stack frame. */ frame_size = (current_frame_info.total_size - (current_frame_info.pretend_size + current_frame_info.reg_size)); if (frame_size == 0) ; /* Nothing to do. */ else if (frame_size <= 32768) emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (-frame_size))); else { rtx tmp = gen_rtx_REG (Pmode, PROLOGUE_TMP_REGNUM); emit_insn (gen_movsi (tmp, GEN_INT (frame_size))); emit_insn (gen_subsi3 (stack_pointer_rtx, stack_pointer_rtx, tmp)); } if (frame_pointer_needed) emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx)); if (current_function_profile) /* Push lr for mcount (form_pc, x). */ emit_insn (gen_movsi_push (stack_pointer_rtx, gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM))); if (pic_reg_used) { m32r_load_pic_register (); m32r_reload_lr (stack_pointer_rtx, (current_function_profile ? 0 : frame_size)); } if (current_function_profile && !pic_reg_used) emit_insn (gen_blockage ()); } /* Set up the stack and frame pointer (if desired) for the function. Note, if this is changed, you need to mirror the changes in m32r_compute_frame_size which calculates the prolog size. */ static void m32r_output_function_prologue (FILE * file, HOST_WIDE_INT size) { enum m32r_function_type fn_type = m32r_compute_function_type (current_function_decl); /* If this is an interrupt handler, mark it as such. */ if (M32R_INTERRUPT_P (fn_type)) fprintf (file, "\t%s interrupt handler\n", ASM_COMMENT_START); if (! current_frame_info.initialized) m32r_compute_frame_size (size); /* This is only for the human reader. */ fprintf (file, "\t%s PROLOGUE, vars= %d, regs= %d, args= %d, extra= %d\n", ASM_COMMENT_START, current_frame_info.var_size, current_frame_info.reg_size / 4, current_frame_info.args_size, current_frame_info.extra_size); } /* Do any necessary cleanup after a function to restore stack, frame, and regs. */ static void m32r_output_function_epilogue (FILE * file, HOST_WIDE_INT size ATTRIBUTE_UNUSED) { int regno; int noepilogue = FALSE; int total_size; enum m32r_function_type fn_type = m32r_compute_function_type (current_function_decl); /* This is only for the human reader. */ fprintf (file, "\t%s EPILOGUE\n", ASM_COMMENT_START); if (!current_frame_info.initialized) abort (); total_size = current_frame_info.total_size; if (total_size == 0) { rtx insn = get_last_insn (); /* If the last insn was a BARRIER, we don't have to write any code because a jump (aka return) was put there. */ if (GET_CODE (insn) == NOTE) insn = prev_nonnote_insn (insn); if (insn && GET_CODE (insn) == BARRIER) noepilogue = TRUE; } if (!noepilogue) { unsigned int var_size = current_frame_info.var_size; unsigned int args_size = current_frame_info.args_size; unsigned int gmask = current_frame_info.gmask; int can_trust_sp_p = !current_function_calls_alloca; const char * sp_str = reg_names[STACK_POINTER_REGNUM]; const char * fp_str = reg_names[FRAME_POINTER_REGNUM]; /* The first thing to do is point the sp at the bottom of the register save area. */ if (can_trust_sp_p) { unsigned int reg_offset = var_size + args_size; if (reg_offset == 0) ; /* Nothing to do. */ else if (reg_offset < 128) fprintf (file, "\taddi %s,%s%d\n", sp_str, IMMEDIATE_PREFIX, reg_offset); else if (reg_offset < 32768) fprintf (file, "\tadd3 %s,%s,%s%d\n", sp_str, sp_str, IMMEDIATE_PREFIX, reg_offset); else fprintf (file, "\tld24 %s,%s%d\n\tadd %s,%s\n", reg_names[PROLOGUE_TMP_REGNUM], IMMEDIATE_PREFIX, reg_offset, sp_str, reg_names[PROLOGUE_TMP_REGNUM]); } else if (frame_pointer_needed) { unsigned int reg_offset = var_size + args_size; if (reg_offset == 0) fprintf (file, "\tmv %s,%s\n", sp_str, fp_str); else if (reg_offset < 32768) fprintf (file, "\tadd3 %s,%s,%s%d\n", sp_str, fp_str, IMMEDIATE_PREFIX, reg_offset); else fprintf (file, "\tld24 %s,%s%d\n\tadd %s,%s\n", reg_names[PROLOGUE_TMP_REGNUM], IMMEDIATE_PREFIX, reg_offset, sp_str, reg_names[PROLOGUE_TMP_REGNUM]); } else abort (); if (current_frame_info.save_lr) fprintf (file, "\tpop %s\n", reg_names[RETURN_ADDR_REGNUM]); /* Restore any saved registers, in reverse order of course. */ gmask &= ~(FRAME_POINTER_MASK | RETURN_ADDR_MASK); for (regno = M32R_MAX_INT_REGS - 1; regno >= 0; --regno) { if ((gmask & (1L << regno)) != 0) fprintf (file, "\tpop %s\n", reg_names[regno]); } if (current_frame_info.save_fp) fprintf (file, "\tpop %s\n", fp_str); /* Remove varargs area if present. */ if (current_frame_info.pretend_size != 0) fprintf (file, "\taddi %s,%s%d\n", sp_str, IMMEDIATE_PREFIX, current_frame_info.pretend_size); /* Emit the return instruction. */ if (M32R_INTERRUPT_P (fn_type)) fprintf (file, "\trte\n"); else fprintf (file, "\tjmp %s\n", reg_names[RETURN_ADDR_REGNUM]); } /* Reset state info for each function. */ current_frame_info = zero_frame_info; m32r_compute_function_type (NULL_TREE); } /* Return nonzero if this function is known to have a null or 1 instruction epilogue. */ int direct_return (void) { if (!reload_completed) return FALSE; if (! current_frame_info.initialized) m32r_compute_frame_size (get_frame_size ()); return current_frame_info.total_size == 0; } /* PIC. */ int m32r_legitimate_pic_operand_p (rtx x) { if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == LABEL_REF) return 0; if (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS && (GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF || GET_CODE (XEXP (XEXP (x, 0), 0)) == LABEL_REF) && (GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) return 0; return 1; } rtx m32r_legitimize_pic_address (rtx orig, rtx reg) { #ifdef DEBUG_PIC printf("m32r_legitimize_pic_address()\n"); #endif if (GET_CODE (orig) == SYMBOL_REF || GET_CODE (orig) == LABEL_REF) { rtx pic_ref, address; rtx insn; int subregs = 0; if (reg == 0) { if (reload_in_progress || reload_completed) abort (); else reg = gen_reg_rtx (Pmode); subregs = 1; } if (subregs) address = gen_reg_rtx (Pmode); else address = reg; emit_insn (gen_pic_load_addr (address, orig)); emit_insn (gen_addsi3 (address, address, pic_offset_table_rtx)); pic_ref = gen_rtx_MEM (Pmode, address); RTX_UNCHANGING_P (pic_ref) = 1; insn = emit_move_insn (reg, pic_ref); current_function_uses_pic_offset_table = 1; #if 0 /* Put a REG_EQUAL note on this insn, so that it can be optimized by loop. */ REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL, orig, REG_NOTES (insn)); #endif return reg; } else if (GET_CODE (orig) == CONST) { rtx base, offset; if (GET_CODE (XEXP (orig, 0)) == PLUS && XEXP (XEXP (orig, 0), 1) == pic_offset_table_rtx) return orig; if (reg == 0) { if (reload_in_progress || reload_completed) abort (); else reg = gen_reg_rtx (Pmode); } if (GET_CODE (XEXP (orig, 0)) == PLUS) { base = m32r_legitimize_pic_address (XEXP (XEXP (orig, 0), 0), reg); if (base == reg) offset = m32r_legitimize_pic_address (XEXP (XEXP (orig, 0), 1), NULL_RTX); else offset = m32r_legitimize_pic_address (XEXP (XEXP (orig, 0), 1), reg); } else return orig; if (GET_CODE (offset) == CONST_INT) { if (INT16_P (INTVAL (offset))) return plus_constant (base, INTVAL (offset)); else if (! reload_in_progress && ! reload_completed) offset = force_reg (Pmode, offset); else /* If we reach here, then something is seriously wrong. */ abort (); } return gen_rtx_PLUS (Pmode, base, offset); } return orig; } /* Emit special PIC prologues and epilogues. */ void m32r_finalize_pic (void) { current_function_uses_pic_offset_table |= current_function_profile; } /* Nested function support. */ /* Emit RTL insns to initialize the variable parts of a trampoline. FNADDR is an RTX for the address of the function's pure code. CXT is an RTX for the static chain value for the function. */ void m32r_initialize_trampoline (rtx tramp ATTRIBUTE_UNUSED, rtx fnaddr ATTRIBUTE_UNUSED, rtx cxt ATTRIBUTE_UNUSED) { } static void m32r_file_start (void) { default_file_start (); if (flag_verbose_asm) fprintf (asm_out_file, "%s M32R/D special options: -G " HOST_WIDE_INT_PRINT_UNSIGNED "\n", ASM_COMMENT_START, g_switch_value); if (TARGET_LITTLE_ENDIAN) fprintf (asm_out_file, "\t.little\n"); } /* Print operand X (an rtx) in assembler syntax to file FILE. CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified. For `%' followed by punctuation, CODE is the punctuation and X is null. */ void m32r_print_operand (FILE * file, rtx x, int code) { rtx addr; switch (code) { /* The 's' and 'p' codes are used by output_block_move() to indicate post-increment 's'tores and 'p're-increment loads. */ case 's': if (GET_CODE (x) == REG) fprintf (file, "@+%s", reg_names [REGNO (x)]); else output_operand_lossage ("invalid operand to %%s code"); return; case 'p': if (GET_CODE (x) == REG) fprintf (file, "@%s+", reg_names [REGNO (x)]); else output_operand_lossage ("invalid operand to %%p code"); return; case 'R' : /* Write second word of DImode or DFmode reference, register or memory. */ if (GET_CODE (x) == REG) fputs (reg_names[REGNO (x)+1], file); else if (GET_CODE (x) == MEM) { fprintf (file, "@("); /* Handle possible auto-increment. Since it is pre-increment and we have already done it, we can just use an offset of four. */ /* ??? This is taken from rs6000.c I think. I don't think it is currently necessary, but keep it around. */ if (GET_CODE (XEXP (x, 0)) == PRE_INC || GET_CODE (XEXP (x, 0)) == PRE_DEC) output_address (plus_constant (XEXP (XEXP (x, 0), 0), 4)); else output_address (plus_constant (XEXP (x, 0), 4)); fputc (')', file); } else output_operand_lossage ("invalid operand to %%R code"); return; case 'H' : /* High word. */ case 'L' : /* Low word. */ if (GET_CODE (x) == REG) { /* L = least significant word, H = most significant word. */ if ((WORDS_BIG_ENDIAN != 0) ^ (code == 'L')) fputs (reg_names[REGNO (x)], file); else fputs (reg_names[REGNO (x)+1], file); } else if (GET_CODE (x) == CONST_INT || GET_CODE (x) == CONST_DOUBLE) { rtx first, second; split_double (x, &first, &second); fprintf (file, HOST_WIDE_INT_PRINT_HEX, code == 'L' ? INTVAL (first) : INTVAL (second)); } else output_operand_lossage ("invalid operand to %%H/%%L code"); return; case 'A' : { char str[30]; if (GET_CODE (x) != CONST_DOUBLE || GET_MODE_CLASS (GET_MODE (x)) != MODE_FLOAT) fatal_insn ("bad insn for 'A'", x); real_to_decimal (str, CONST_DOUBLE_REAL_VALUE (x), sizeof (str), 0, 1); fprintf (file, "%s", str); return; } case 'B' : /* Bottom half. */ case 'T' : /* Top half. */ /* Output the argument to a `seth' insn (sets the Top half-word). For constants output arguments to a seth/or3 pair to set Top and Bottom halves. For symbols output arguments to a seth/add3 pair to set Top and Bottom halves. The difference exists because for constants seth/or3 is more readable but for symbols we need to use the same scheme as `ld' and `st' insns (16 bit addend is signed). */ switch (GET_CODE (x)) { case CONST_INT : case CONST_DOUBLE : { rtx first, second; split_double (x, &first, &second); x = WORDS_BIG_ENDIAN ? second : first; fprintf (file, HOST_WIDE_INT_PRINT_HEX, (code == 'B' ? INTVAL (x) & 0xffff : (INTVAL (x) >> 16) & 0xffff)); } return; case CONST : case SYMBOL_REF : if (code == 'B' && small_data_operand (x, VOIDmode)) { fputs ("sda(", file); output_addr_const (file, x); fputc (')', file); return; } /* fall through */ case LABEL_REF : fputs (code == 'T' ? "shigh(" : "low(", file); output_addr_const (file, x); fputc (')', file); return; default : output_operand_lossage ("invalid operand to %%T/%%B code"); return; } break; case 'U' : /* ??? wip */ /* Output a load/store with update indicator if appropriate. */ if (GET_CODE (x) == MEM) { if (GET_CODE (XEXP (x, 0)) == PRE_INC || GET_CODE (XEXP (x, 0)) == PRE_DEC) fputs (".a", file); } else output_operand_lossage ("invalid operand to %%U code"); return; case 'N' : /* Print a constant value negated. */ if (GET_CODE (x) == CONST_INT) output_addr_const (file, GEN_INT (- INTVAL (x))); else output_operand_lossage ("invalid operand to %%N code"); return; case 'X' : /* Print a const_int in hex. Used in comments. */ if (GET_CODE (x) == CONST_INT) fprintf (file, HOST_WIDE_INT_PRINT_HEX, INTVAL (x)); return; case '#' : fputs (IMMEDIATE_PREFIX, file); return; case 0 : /* Do nothing special. */ break; default : /* Unknown flag. */ output_operand_lossage ("invalid operand output code"); } switch (GET_CODE (x)) { case REG : fputs (reg_names[REGNO (x)], file); break; case MEM : addr = XEXP (x, 0); if (GET_CODE (addr) == PRE_INC) { if (GET_CODE (XEXP (addr, 0)) != REG) fatal_insn ("pre-increment address is not a register", x); fprintf (file, "@+%s", reg_names[REGNO (XEXP (addr, 0))]); } else if (GET_CODE (addr) == PRE_DEC) { if (GET_CODE (XEXP (addr, 0)) != REG) fatal_insn ("pre-decrement address is not a register", x); fprintf (file, "@-%s", reg_names[REGNO (XEXP (addr, 0))]); } else if (GET_CODE (addr) == POST_INC) { if (GET_CODE (XEXP (addr, 0)) != REG) fatal_insn ("post-increment address is not a register", x); fprintf (file, "@%s+", reg_names[REGNO (XEXP (addr, 0))]); } else { fputs ("@(", file); output_address (XEXP (x, 0)); fputc (')', file); } break; case CONST_DOUBLE : /* We handle SFmode constants here as output_addr_const doesn't. */ if (GET_MODE (x) == SFmode) { REAL_VALUE_TYPE d; long l; REAL_VALUE_FROM_CONST_DOUBLE (d, x); REAL_VALUE_TO_TARGET_SINGLE (d, l); fprintf (file, "0x%08lx", l); break; } /* Fall through. Let output_addr_const deal with it. */ default : output_addr_const (file, x); break; } } /* Print a memory address as an operand to reference that memory location. */ void m32r_print_operand_address (FILE * file, rtx addr) { rtx base; rtx index = 0; int offset = 0; switch (GET_CODE (addr)) { case REG : fputs (reg_names[REGNO (addr)], file); break; case PLUS : if (GET_CODE (XEXP (addr, 0)) == CONST_INT) offset = INTVAL (XEXP (addr, 0)), base = XEXP (addr, 1); else if (GET_CODE (XEXP (addr, 1)) == CONST_INT) offset = INTVAL (XEXP (addr, 1)), base = XEXP (addr, 0); else base = XEXP (addr, 0), index = XEXP (addr, 1); if (GET_CODE (base) == REG) { /* Print the offset first (if present) to conform to the manual. */ if (index == 0) { if (offset != 0) fprintf (file, "%d,", offset); fputs (reg_names[REGNO (base)], file); } /* The chip doesn't support this, but left in for generality. */ else if (GET_CODE (index) == REG) fprintf (file, "%s,%s", reg_names[REGNO (base)], reg_names[REGNO (index)]); /* Not sure this can happen, but leave in for now. */ else if (GET_CODE (index) == SYMBOL_REF) { output_addr_const (file, index); fputc (',', file); fputs (reg_names[REGNO (base)], file); } else fatal_insn ("bad address", addr); } else if (GET_CODE (base) == LO_SUM) { if (index != 0 || GET_CODE (XEXP (base, 0)) != REG) abort (); if (small_data_operand (XEXP (base, 1), VOIDmode)) fputs ("sda(", file); else fputs ("low(", file); output_addr_const (file, plus_constant (XEXP (base, 1), offset)); fputs ("),", file); fputs (reg_names[REGNO (XEXP (base, 0))], file); } else fatal_insn ("bad address", addr); break; case LO_SUM : if (GET_CODE (XEXP (addr, 0)) != REG) fatal_insn ("lo_sum not of register", addr); if (small_data_operand (XEXP (addr, 1), VOIDmode)) fputs ("sda(", file); else fputs ("low(", file); output_addr_const (file, XEXP (addr, 1)); fputs ("),", file); fputs (reg_names[REGNO (XEXP (addr, 0))], file); break; case PRE_INC : /* Assume SImode. */ fprintf (file, "+%s", reg_names[REGNO (XEXP (addr, 0))]); break; case PRE_DEC : /* Assume SImode. */ fprintf (file, "-%s", reg_names[REGNO (XEXP (addr, 0))]); break; case POST_INC : /* Assume SImode. */ fprintf (file, "%s+", reg_names[REGNO (XEXP (addr, 0))]); break; default : output_addr_const (file, addr); break; } } /* Return true if the operands are the constants 0 and 1. */ int zero_and_one (rtx operand1, rtx operand2) { return GET_CODE (operand1) == CONST_INT && GET_CODE (operand2) == CONST_INT && ( ((INTVAL (operand1) == 0) && (INTVAL (operand2) == 1)) ||((INTVAL (operand1) == 1) && (INTVAL (operand2) == 0))); } /* Return nonzero if the operand is suitable for use in a conditional move sequence. */ int conditional_move_operand (rtx operand, enum machine_mode mode) { /* Only defined for simple integers so far... */ if (mode != SImode && mode != HImode && mode != QImode) return FALSE; /* At the moment we can handle moving registers and loading constants. */ /* To be added: Addition/subtraction/bitops/multiplication of registers. */ switch (GET_CODE (operand)) { case REG: return 1; case CONST_INT: return INT8_P (INTVAL (operand)); default: #if 0 fprintf (stderr, "Test for cond move op of type: %s\n", GET_RTX_NAME (GET_CODE (operand))); #endif return 0; } } /* Return true if the code is a test of the carry bit. */ int carry_compare_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { rtx x; if (GET_MODE (op) != CCmode && GET_MODE (op) != VOIDmode) return FALSE; if (GET_CODE (op) != NE && GET_CODE (op) != EQ) return FALSE; x = XEXP (op, 0); if (GET_CODE (x) != REG || REGNO (x) != CARRY_REGNUM) return FALSE; x = XEXP (op, 1); if (GET_CODE (x) != CONST_INT || INTVAL (x) != 0) return FALSE; return TRUE; } /* Generate the correct assembler code to handle the conditional loading of a value into a register. It is known that the operands satisfy the conditional_move_operand() function above. The destination is operand[0]. The condition is operand [1]. The 'true' value is operand [2] and the 'false' value is operand [3]. */ char * emit_cond_move (rtx * operands, rtx insn ATTRIBUTE_UNUSED) { static char buffer [100]; const char * dest = reg_names [REGNO (operands [0])]; buffer [0] = 0; /* Destination must be a register. */ if (GET_CODE (operands [0]) != REG) abort(); if (! conditional_move_operand (operands [2], SImode)) abort(); if (! conditional_move_operand (operands [3], SImode)) abort(); /* Check to see if the test is reversed. */ if (GET_CODE (operands [1]) == NE) { rtx tmp = operands [2]; operands [2] = operands [3]; operands [3] = tmp; } sprintf (buffer, "mvfc %s, cbr", dest); /* If the true value was '0' then we need to invert the results of the move. */ if (INTVAL (operands [2]) == 0) sprintf (buffer + strlen (buffer), "\n\txor3 %s, %s, #1", dest, dest); return buffer; } /* Returns true if the registers contained in the two rtl expressions are different. */ int m32r_not_same_reg (rtx a, rtx b) { int reg_a = -1; int reg_b = -2; while (GET_CODE (a) == SUBREG) a = SUBREG_REG (a); if (GET_CODE (a) == REG) reg_a = REGNO (a); while (GET_CODE (b) == SUBREG) b = SUBREG_REG (b); if (GET_CODE (b) == REG) reg_b = REGNO (b); return reg_a != reg_b; } rtx m32r_function_symbol (const char *name) { int extra_flags = 0; enum m32r_model model; rtx sym = gen_rtx_SYMBOL_REF (Pmode, name); if (TARGET_MODEL_SMALL) model = M32R_MODEL_SMALL; else if (TARGET_MODEL_MEDIUM) model = M32R_MODEL_MEDIUM; else if (TARGET_MODEL_LARGE) model = M32R_MODEL_LARGE; else abort (); /* Shouldn't happen. */ extra_flags |= model << SYMBOL_FLAG_MODEL_SHIFT; if (extra_flags) SYMBOL_REF_FLAGS (sym) |= extra_flags; return sym; } /* Use a library function to move some bytes. */ static void block_move_call (rtx dest_reg, rtx src_reg, rtx bytes_rtx) { /* We want to pass the size as Pmode, which will normally be SImode but will be DImode if we are using 64 bit longs and pointers. */ if (GET_MODE (bytes_rtx) != VOIDmode && GET_MODE (bytes_rtx) != Pmode) bytes_rtx = convert_to_mode (Pmode, bytes_rtx, 1); emit_library_call (m32r_function_symbol ("memcpy"), 0, VOIDmode, 3, dest_reg, Pmode, src_reg, Pmode, convert_to_mode (TYPE_MODE (sizetype), bytes_rtx, TYPE_UNSIGNED (sizetype)), TYPE_MODE (sizetype)); } /* The maximum number of bytes to copy using pairs of load/store instructions. If a block is larger than this then a loop will be generated to copy MAX_MOVE_BYTES chunks at a time. The value of 32 is a semi-arbitrary choice. A customer uses Dhrystome as their benchmark, and Dhrystone has a 31 byte string copy in it. */ #define MAX_MOVE_BYTES 32 /* Expand string/block move operations. operands[0] is the pointer to the destination. operands[1] is the pointer to the source. operands[2] is the number of bytes to move. operands[3] is the alignment. */ void m32r_expand_block_move (rtx operands[]) { rtx orig_dst = operands[0]; rtx orig_src = operands[1]; rtx bytes_rtx = operands[2]; rtx align_rtx = operands[3]; int constp = GET_CODE (bytes_rtx) == CONST_INT; HOST_WIDE_INT bytes = constp ? INTVAL (bytes_rtx) : 0; int align = INTVAL (align_rtx); int leftover; rtx src_reg; rtx dst_reg; if (constp && bytes <= 0) return; /* Move the address into scratch registers. */ dst_reg = copy_addr_to_reg (XEXP (orig_dst, 0)); src_reg = copy_addr_to_reg (XEXP (orig_src, 0)); if (align > UNITS_PER_WORD) align = UNITS_PER_WORD; /* If we prefer size over speed, always use a function call. If we do not know the size, use a function call. If the blocks are not word aligned, use a function call. */ if (optimize_size || ! constp || align != UNITS_PER_WORD) { block_move_call (dst_reg, src_reg, bytes_rtx); return; } leftover = bytes % MAX_MOVE_BYTES; bytes -= leftover; /* If necessary, generate a loop to handle the bulk of the copy. */ if (bytes) { rtx label = NULL_RTX; rtx final_src = NULL_RTX; rtx at_a_time = GEN_INT (MAX_MOVE_BYTES); rtx rounded_total = GEN_INT (bytes); rtx new_dst_reg = gen_reg_rtx (SImode); rtx new_src_reg = gen_reg_rtx (SImode); /* If we are going to have to perform this loop more than once, then generate a label and compute the address the source register will contain upon completion of the final iteration. */ if (bytes > MAX_MOVE_BYTES) { final_src = gen_reg_rtx (Pmode); if (INT16_P(bytes)) emit_insn (gen_addsi3 (final_src, src_reg, rounded_total)); else { emit_insn (gen_movsi (final_src, rounded_total)); emit_insn (gen_addsi3 (final_src, final_src, src_reg)); } label = gen_label_rtx (); emit_label (label); } /* It is known that output_block_move() will update src_reg to point to the word after the end of the source block, and dst_reg to point to the last word of the destination block, provided that the block is MAX_MOVE_BYTES long. */ emit_insn (gen_movmemsi_internal (dst_reg, src_reg, at_a_time, new_dst_reg, new_src_reg)); emit_move_insn (dst_reg, new_dst_reg); emit_move_insn (src_reg, new_src_reg); emit_insn (gen_addsi3 (dst_reg, dst_reg, GEN_INT (4))); if (bytes > MAX_MOVE_BYTES) { emit_insn (gen_cmpsi (src_reg, final_src)); emit_jump_insn (gen_bne (label)); } } if (leftover) emit_insn (gen_movmemsi_internal (dst_reg, src_reg, GEN_INT (leftover), gen_reg_rtx (SImode), gen_reg_rtx (SImode))); } /* Emit load/stores for a small constant word aligned block_move. operands[0] is the memory address of the destination. operands[1] is the memory address of the source. operands[2] is the number of bytes to move. operands[3] is a temp register. operands[4] is a temp register. */ void m32r_output_block_move (rtx insn ATTRIBUTE_UNUSED, rtx operands[]) { HOST_WIDE_INT bytes = INTVAL (operands[2]); int first_time; int got_extra = 0; if (bytes < 1 || bytes > MAX_MOVE_BYTES) abort (); /* We do not have a post-increment store available, so the first set of stores are done without any increment, then the remaining ones can use the pre-increment addressing mode. Note: expand_block_move() also relies upon this behavior when building loops to copy large blocks. */ first_time = 1; while (bytes > 0) { if (bytes >= 8) { if (first_time) { output_asm_insn ("ld\t%5, %p1", operands); output_asm_insn ("ld\t%6, %p1", operands); output_asm_insn ("st\t%5, @%0", operands); output_asm_insn ("st\t%6, %s0", operands); } else { output_asm_insn ("ld\t%5, %p1", operands); output_asm_insn ("ld\t%6, %p1", operands); output_asm_insn ("st\t%5, %s0", operands); output_asm_insn ("st\t%6, %s0", operands); } bytes -= 8; } else if (bytes >= 4) { if (bytes > 4) got_extra = 1; output_asm_insn ("ld\t%5, %p1", operands); if (got_extra) output_asm_insn ("ld\t%6, %p1", operands); if (first_time) output_asm_insn ("st\t%5, @%0", operands); else output_asm_insn ("st\t%5, %s0", operands); bytes -= 4; } else { /* Get the entire next word, even though we do not want all of it. The saves us from doing several smaller loads, and we assume that we cannot cause a page fault when at least part of the word is in valid memory [since we don't get called if things aren't properly aligned]. */ int dst_offset = first_time ? 0 : 4; /* The amount of increment we have to make to the destination pointer. */ int dst_inc_amount = dst_offset + bytes - 4; /* The same for the source pointer. */ int src_inc_amount = bytes; int last_shift; rtx my_operands[3]; /* If got_extra is true then we have already loaded the next word as part of loading and storing the previous word. */ if (! got_extra) output_asm_insn ("ld\t%6, @%1", operands); if (bytes >= 2) { bytes -= 2; output_asm_insn ("sra3\t%5, %6, #16", operands); my_operands[0] = operands[5]; my_operands[1] = GEN_INT (dst_offset); my_operands[2] = operands[0]; output_asm_insn ("sth\t%0, @(%1,%2)", my_operands); /* If there is a byte left to store then increment the destination address and shift the contents of the source register down by 8 bits. We could not do the address increment in the store half word instruction, because it does not have an auto increment mode. */ if (bytes > 0) /* assert (bytes == 1) */ { dst_offset += 2; last_shift = 8; } } else last_shift = 24; if (bytes > 0) { my_operands[0] = operands[6]; my_operands[1] = GEN_INT (last_shift); output_asm_insn ("srai\t%0, #%1", my_operands); my_operands[0] = operands[6]; my_operands[1] = GEN_INT (dst_offset); my_operands[2] = operands[0]; output_asm_insn ("stb\t%0, @(%1,%2)", my_operands); } /* Update the destination pointer if needed. We have to do this so that the patterns matches what we output in this function. */ if (dst_inc_amount && !find_reg_note (insn, REG_UNUSED, operands[0])) { my_operands[0] = operands[0]; my_operands[1] = GEN_INT (dst_inc_amount); output_asm_insn ("addi\t%0, #%1", my_operands); } /* Update the source pointer if needed. We have to do this so that the patterns matches what we output in this function. */ if (src_inc_amount && !find_reg_note (insn, REG_UNUSED, operands[1])) { my_operands[0] = operands[1]; my_operands[1] = GEN_INT (src_inc_amount); output_asm_insn ("addi\t%0, #%1", my_operands); } bytes = 0; } first_time = 0; } } /* Return true if op is an integer constant, less than or equal to MAX_MOVE_BYTES. */ int m32r_block_immediate_operand (rtx op, enum machine_mode mode ATTRIBUTE_UNUSED) { if (GET_CODE (op) != CONST_INT || INTVAL (op) > MAX_MOVE_BYTES || INTVAL (op) <= 0) return 0; return 1; } /* Return true if using NEW_REG in place of OLD_REG is ok. */ int m32r_hard_regno_rename_ok (unsigned int old_reg ATTRIBUTE_UNUSED, unsigned int new_reg) { /* Interrupt routines can't clobber any register that isn't already used. */ if (lookup_attribute ("interrupt", DECL_ATTRIBUTES (current_function_decl)) && !regs_ever_live[new_reg]) return 0; /* We currently emit epilogues as text, not rtl, so the liveness of the return address register isn't visible. */ if (current_function_is_leaf && new_reg == RETURN_ADDR_REGNUM) return 0; return 1; } rtx m32r_return_addr (int count) { if (count != 0) return const0_rtx; return get_hard_reg_initial_val (Pmode, RETURN_ADDR_REGNUM); }