diff options
Diffstat (limited to 'gcc/ira-costs.c')
| -rw-r--r-- | gcc/ira-costs.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gcc/ira-costs.c b/gcc/ira-costs.c index d2806bdffbd..508394e2962 100644 --- a/gcc/ira-costs.c +++ b/gcc/ira-costs.c @@ -1292,10 +1292,13 @@ scan_one_insn (rtx insn) a memory requiring special instructions to load it, decreasing mem_cost might result in it being loaded using the specialized instruction into a register, then stored into stack and loaded - again from the stack. See PR52208. */ + again from the stack. See PR52208. + + Don't do this if SET_SRC (set) has side effect. See PR56124. */ if (set != 0 && REG_P (SET_DEST (set)) && MEM_P (SET_SRC (set)) && (note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) != NULL_RTX - && ((MEM_P (XEXP (note, 0))) + && ((MEM_P (XEXP (note, 0)) + && !side_effects_p (SET_SRC (set))) || (CONSTANT_P (XEXP (note, 0)) && targetm.legitimate_constant_p (GET_MODE (SET_DEST (set)), XEXP (note, 0)) |