diff options
Diffstat (limited to 'gcc/config/m68k')
| -rw-r--r-- | gcc/config/m68k/m68k.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c index 0862936b1b4..8db98fc4f46 100644 --- a/gcc/config/m68k/m68k.c +++ b/gcc/config/m68k/m68k.c @@ -1399,6 +1399,30 @@ flags_in_68881 (void) return cc_status.flags & CC_IN_68881; } +/* Return true if PARALLEL contains register REGNO. */ +static bool +m68k_reg_present_p (const_rtx parallel, unsigned int regno) +{ + int i; + + if (REG_P (parallel) && REGNO (parallel) == regno) + return true; + + if (GET_CODE (parallel) != PARALLEL) + return false; + + for (i = 0; i < XVECLEN (parallel, 0); ++i) + { + const_rtx x; + + x = XEXP (XVECEXP (parallel, 0, i), 0); + if (REG_P (x) && REGNO (x) == regno) + return true; + } + + return false; +} + /* Implement TARGET_FUNCTION_OK_FOR_SIBCALL_P. */ static bool @@ -1411,6 +1435,26 @@ m68k_ok_for_sibcall_p (tree decl, tree exp) if (CALL_EXPR_STATIC_CHAIN (exp)) return false; + if (!VOID_TYPE_P (TREE_TYPE (DECL_RESULT (cfun->decl)))) + { + /* Check that the return value locations are the same. For + example that we aren't returning a value from the sibling in + a D0 register but then need to transfer it to a A0 register. */ + rtx cfun_value; + rtx call_value; + + cfun_value = FUNCTION_VALUE (TREE_TYPE (DECL_RESULT (cfun->decl)), + cfun->decl); + call_value = FUNCTION_VALUE (TREE_TYPE (exp), decl); + + /* Check that the values are equal or that the result the callee + function returns is superset of what the current function returns. */ + if (!(rtx_equal_p (cfun_value, call_value) + || (REG_P (cfun_value) + && m68k_reg_present_p (call_value, REGNO (cfun_value))))) + return false; + } + kind = m68k_get_function_kind (current_function_decl); if (kind == m68k_fk_normal_function) /* We can always sibcall from a normal function, because it's @@ -5188,6 +5232,9 @@ m68k_libcall_value (enum machine_mode mode) return gen_rtx_REG (mode, m68k_libcall_value_in_a0_p ? A0_REG : D0_REG); } +/* Location in which function value is returned. + NOTE: Due to differences in ABIs, don't call this function directly, + use FUNCTION_VALUE instead. */ rtx m68k_function_value (const_tree valtype, const_tree func ATTRIBUTE_UNUSED) { |