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| author | Jakub Jelinek <jakub@redhat.com> | 2017-04-29 18:18:11 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2017-04-29 18:18:11 +0200 |
| commit | cc3a5b33bae232329f4d02a3a8e391623ceeb5c0 (patch) | |
| tree | 7e1e3c5912be6b6c60bd5070c6e75bf61afe703b | |
| parent | bc36c711daea959554c32389a1b28da682257b38 (diff) | |
| download | gcc-cc3a5b33bae232329f4d02a3a8e391623ceeb5c0.zip gcc-cc3a5b33bae232329f4d02a3a8e391623ceeb5c0.tar.gz gcc-cc3a5b33bae232329f4d02a3a8e391623ceeb5c0.tar.bz2 | |
re PR rtl-optimization/80491 (Compiler regression for long-add case.)
PR rtl-optimization/80491
* ifcvt.c (noce_process_if_block): When looking for x setter
with missing else_bb, don't check only the insn right before
cond_earliest, but look for the last insn that x is modified in
within the same bb.
From-SVN: r247410
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/ifcvt.c | 9 |
2 files changed, 14 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9a9d192..bb380b3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,6 +1,12 @@ 2017-04-29 Jakub Jelinek <jakub@redhat.com> PR rtl-optimization/80491 + * ifcvt.c (noce_process_if_block): When looking for x setter + with missing else_bb, don't check only the insn right before + cond_earliest, but look for the last insn that x is modified in + within the same bb. + + PR rtl-optimization/80491 * alias.c (memory_modified_in_insn_p): Return true for CALL_INSNs. 2017-04-29 Marc Glisse <marc.glisse@inria.fr> diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index e51ccab..75458589 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -3440,7 +3440,14 @@ noce_process_if_block (struct noce_if_info *if_info) } else { - insn_b = prev_nonnote_nondebug_insn (if_info->cond_earliest); + insn_b = if_info->cond_earliest; + do + insn_b = prev_nonnote_nondebug_insn (insn_b); + while (insn_b + && (BLOCK_FOR_INSN (insn_b) + == BLOCK_FOR_INSN (if_info->cond_earliest)) + && !modified_in_p (x, insn_b)); + /* We're going to be moving the evaluation of B down from above COND_EARLIEST to JUMP. Make sure the relevant data is still intact. */ |