diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 1c1a74f..5bb49cb 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -6705,20 +6705,16 @@ simplify_set (rtx x) if (other_changed) undobuf.other_insn = other_insn; - /* Otherwise, if we didn't previously have a COMPARE in the - correct mode, we need one. */ - if (GET_CODE (src) != COMPARE || GET_MODE (src) != compare_mode) - { - SUBST (SET_SRC (x), gen_rtx_COMPARE (compare_mode, op0, op1)); - src = SET_SRC (x); - } - else if (GET_MODE (op0) == compare_mode && op1 == const0_rtx) + /* Don't generate a compare of a CC with 0, just use that CC. */ + if (GET_MODE (op0) == compare_mode && op1 == const0_rtx) { SUBST (SET_SRC (x), op0); src = SET_SRC (x); } - /* Otherwise, update the COMPARE if needed. */ - else if (XEXP (src, 0) != op0 || XEXP (src, 1) != op1) + /* Otherwise, if we didn't previously have the same COMPARE we + want, create it from scratch. */ + else if (GET_CODE (src) != COMPARE || GET_MODE (src) != compare_mode + || XEXP (src, 0) != op0 || XEXP (src, 1) != op1) { SUBST (SET_SRC (x), gen_rtx_COMPARE (compare_mode, op0, op1)); src = SET_SRC (x); |