diff options
| author | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 1997-05-18 12:39:57 +0000 |
|---|---|---|
| committer | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 1997-05-18 12:39:57 +0000 |
| commit | acb299a41423e53cf1ef154b7824e77e21e6619d (patch) | |
| tree | a56f12fa3f6d73aaee5dcaf590d3ac4bbe1c3a44 | |
| parent | a54a5c443745b2874051d3973086137d438b1360 (diff) | |
(maybe_eliminate_biv_1): In (set (cc0) <biv>) case, swap compare
operands when mult_val < 0 in one additional place.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@14087 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/loop.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index 64c1245977a..1c2cbc24161 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -6343,9 +6343,10 @@ maybe_eliminate_biv_1 (x, insn, bl, eliminate_p, where) emit_insn_before (gen_move_insn (tem, copy_rtx (v->add_val)), where); - if (validate_change (insn, &SET_SRC (PATTERN (insn)), - gen_rtx (COMPARE, VOIDmode, - v->new_reg, tem), 0)) + /* Substitute the new register for its invariant value in + the compare expression. */ + XEXP (new, (INTVAL (v->mult_val) < 0) ? 0 : 1) = tem; + if (validate_change (insn, &SET_SRC (PATTERN (insn)), new, 0)) return 1; } } |