* rtl.h (MEM_READONLY_P): Replace RTX_UNCHANGING_P.

	* alias.c (true_dependence): Update to match new semantics.
	(canon_true_dependence, write_dependence_p): Likewise.
	(anti_dependence, output_dependence): Update write_dependence_p args.
	(unchanging_anti_dependence): Remove.
	* calls.c (purge_mem_unchanging_flag): Remove.
	(fixup_tail_calls): Don't call it.
	(expand_call): Don't add unchanging memory to function usage.
	* expr.c (emit_block_move_via_libcall): Likewise.
	(clear_storage_via_libcall): Don't clobber RTX_UNCHANGING_P mems.
	(get_subtarget): Don't use RTX_UNCHANGING_P.
	(expand_assignment, store_constructor, expand_expr_real_1): Likewise.
	(do_tablejump): Set MEM_READONLY_P, not RTX_UNCHANGING_P.
	* combine.c (get_last_value_validate): Use MEM_READONLY_P.
	* cse.c (insert): Don't use RTX_UNCHANGING_P.
	(cse_insn, canon_hash): Use MEM_READONLY_P.
	* emit-rtl.c (set_mem_attributes_minus_bitpos): Use MEM_READONLY_P
	instead of RTX_UNCHANGING_P.
	* explow.c (maybe_set_unchanging): Remove.
	* expr.h (maybe_set_unchanging): Remove.
	* flow.c (insn_dead_p, mark_used_regs): Use anti_dependence.
	* function.c (assign_stack_temp_for_type): Don't use RTX_UNCHANGING_P.
	(assign_parm_setup_reg, expand_function_start): Likewise.
	* integrate.c (copy_rtx_and_substitute): Likewise.
	* ra-rewrite.c (emit_colors): Likewise.
	* regmove.c (copy_src_to_dest, regmove_optimize): Likewise.
	(fixup_match_1): Likewise.
	* reload1.c (reload, alter_reg): Likewise.
	* local-alloc.c (validate_equiv_mem): Check MEM_READONLY_P,
	not RTX_UNCHANGING_P.
	(equiv_init_varies_p): Likewise.
	* loop-invariant.c (check_maybe_invariant): Likewise.
	* resource.c (mark_referenced_resources, mark_set_resources): Likewise.
	* loop.c (note_addr_stored): Likewise.
	(prescan_loop): Likewise. Don't check function usage for clobbered
	unchanging memory.
	* rtlanal.c (rtx_unstable_p): Check MEM_READONLY_P,
        not RTX_UNCHANGING_P.
	(rtx_varies_p, modified_between_p, modified_in_p): Likewise.
	* varasm.c (force_const_mem): Likewise.
	* stmt.c (expand_decl): Don't set RTX_UNCHANGING_P.
	* web.c (entry_register): Likewise.
	* tree-gimple.h (get_base_address): Move decl ...
	* tree.h: ... here.
	* doc/rtl.texi (MEM_READONLY_P): Replace RTX_UNCHANGING_P.

	* config/alpha/alpha.c (alpha_set_memflags_1): Rewrite to be
	called via for_each_rtx.  Copy MEM_SCALAR_P, MEM_NOTRAP_P too.
	(alpha_set_memflags): Update to match.

	* config/darwin.c (machopic_indirect_data_reference): Set
	MEM_READONLY_P instead of RTX_UNCHANGING_P.
	(machopic_indirect_call_target): Likewise.
	(machopic_legitimize_pic_address): Likewise.
	* config/arm/arm.c (legitimize_pic_address, arm_gen_load_multiple,
	arm_gen_store_multiple, arm_gen_movmemqi): Likewise.
	* config/arm/arm.md (load_multiple, store_multiple): Likewise.
	* config/frv/frv.md (symGOT2reg): Likewise.
	* config/i386/i386.c (legitimize_pic_address,
	legitimize_tls_address, ix86_split_to_parts): Likewise.
	* config/ia64/ia64.c (ia64_expand_tls_address): Likewise.
	* config/ia64/ia64.md (load_fptr): Likewise.
	* config/m32r/m32r.c (m32r_legitimize_pic_address): Likewise.
	* config/m68k/m68k.c (legitimize_pic_address): Likewise.
	* config/mcore/mcore.c (block_move_sequence): Likewise.
	* config/mn10300/mn10300.md (symGOT2reg): Likewise.
	* config/pa/pa.c (legitimize_pic_address): Likewise.
	* config/rs6000/rs6000.c (rs6000_legitimize_tls_address): Likewise.
	(rs6000_emit_move): Likewise.
	* config/s390/s390.c (legitimize_pic_address): Likewise.
	(legitimize_tls_address): Likewise.
	* config/s390/s390.md (casesi): Likewise.
	* config/sh/sh.c (prepare_move_operands, sh_reorg): Likewise.
	* config/sh/sh.md (symGOT2reg): Likewise.
	* config/sparc/sparc.c (legitimize_pic_address): Likewise.
	* config/v850/v850.md (casesi): Likewise.

	* config/ia64/ia64.c (gen_thread_pointer): Don't set RTX_UNCHANGING_P.
	* config/iq2000/iq2000.c (save_restore_insns): Likewise.
	* config/mips/mips.c (mips_restore_gp): Likewise.
	(mips_save_restore_reg, mips16_gp_pseudo_reg): Likewise.
	* config/sh/sh.c (sh_reorg): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@86178 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 1 insertions, 12 deletions

diff --git a/gcc/regmove.c b/gcc/regmove.c
index 5bd6f40e21f..587b5767e3c 100644
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -758,7 +758,6 @@ copy_src_to_dest (rtx insn, rtx src, rtx dest, int old_max_uid)
   if (REG_P (src)
       && REG_LIVE_LENGTH (REGNO (src)) > 0
       && REG_P (dest)
-      && !RTX_UNCHANGING_P (dest)
       && REG_LIVE_LENGTH (REGNO (dest)) > 0
       && (set = single_set (insn)) != NULL_RTX
       && !reg_mentioned_p (dest, SET_SRC (set))
@@ -1262,7 +1261,6 @@ regmove_optimize (rtx f, int nregs, FILE *regmove_dump_file)
 	      if (!REG_P (dst)
 		  || REGNO (dst) < FIRST_PSEUDO_REGISTER
 		  || REG_LIVE_LENGTH (REGNO (dst)) < 0
-		  || RTX_UNCHANGING_P (dst)
 		  || GET_MODE (src) != GET_MODE (dst))
 		continue;
 
@@ -1657,12 +1655,6 @@ fixup_match_1 (rtx insn, rtx set, rtx src, rtx src_subreg, rtx dst,
   rtx src_note = find_reg_note (insn, REG_DEAD, src), dst_note = NULL_RTX;
   int length, s_length;
 
-  /* If SRC is marked as unchanging, we may not change it.
-     ??? Maybe we could get better code by removing the unchanging bit
-     instead, and changing it back if we don't succeed?  */
-  if (RTX_UNCHANGING_P (src))
-    return 0;
-
   if (! src_note)
     {
       /* Look for (set (regX) (op regA constX))
@@ -2039,10 +2031,7 @@ fixup_match_1 (rtx insn, rtx set, rtx src, rtx src_subreg, rtx dst,
    mentioning SRC or mentioning / changing DST .  If in doubt, presume
    it is unstable.
    The rationale is that we want to check if we can move an insn easily
-   while just paying attention to SRC and DST.  A register is considered
-   stable if it has the RTX_UNCHANGING_P bit set, but that would still
-   leave the burden to update REG_DEAD / REG_UNUSED notes, so we don't
-   want any registers but SRC and DST.  */
+   while just paying attention to SRC and DST.  */
 static int
 stable_and_no_regs_but_for_p (rtx x, rtx src, rtx dst)
 {