diff options
Diffstat (limited to 'gcc/postreload-gcse.c')
| -rw-r--r-- | gcc/postreload-gcse.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/postreload-gcse.c b/gcc/postreload-gcse.c index a0334ab8077..ea9c0ef7436 100644 --- a/gcc/postreload-gcse.c +++ b/gcc/postreload-gcse.c @@ -745,6 +745,12 @@ hash_scan_set (rtx insn) can_copy_p (GET_MODE (dest)) /* Is SET_SRC something we want to gcse? */ && general_operand (src, GET_MODE (src)) +#ifdef STACK_REGS + /* Never consider insns touching the register stack. It may + create situations that reg-stack cannot handle (e.g. a stack + register live across an abnormal edge). */ + && (REGNO (dest) < FIRST_STACK_REG || REGNO (dest) > LAST_STACK_REG) +#endif /* An expression is not available if its operands are subsequently modified, including this insn. */ && oprs_unchanged_p (src, insn, true)) @@ -759,6 +765,10 @@ hash_scan_set (rtx insn) can_copy_p (GET_MODE (src)) /* Is SET_DEST something we want to gcse? */ && general_operand (dest, GET_MODE (dest)) +#ifdef STACK_REGS + /* As above for STACK_REGS. */ + && (REGNO (src) < FIRST_STACK_REG || REGNO (src) > LAST_STACK_REG) +#endif && ! (flag_float_store && FLOAT_MODE_P (GET_MODE (dest))) /* Check if the memory expression is killed after insn. */ && ! load_killed_in_block_p (INSN_CUID (insn) + 1, dest, true) |