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| author | Franz Sirl <Franz.Sirl-kernel@lauterbach.com> | 2003-07-14 09:29:44 +0000 |
|---|---|---|
| committer | Franz Sirl <sirl@gcc.gnu.org> | 2003-07-14 09:29:44 +0000 |
| commit | bbd288a44df5e39c05583b77349b436eb3fcc866 (patch) | |
| tree | 911a0f712d5caaf322cd0f488abc5387f110cbba /gcc/gcse.c | |
| parent | 3a009999ba155c613c5545fd752e54a093aec05b (diff) | |
| download | gcc-bbd288a44df5e39c05583b77349b436eb3fcc866.zip gcc-bbd288a44df5e39c05583b77349b436eb3fcc866.tar.gz gcc-bbd288a44df5e39c05583b77349b436eb3fcc866.tar.bz2 | |
re PR rtl-optimization/11440 (gcc-3.3.1 miscompiles c++ code with -O2, -fno-gcse cures it)
2003-07-14 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
PR optimization/11440
* gcse.c (try_replace_reg): Don't attach notes to ZERO_EXTRACT or
SIGN_EXTRACT SETs.
From-SVN: r69325
Diffstat (limited to 'gcc/gcse.c')
| -rw-r--r-- | gcc/gcse.c | 9 |
1 files changed, 6 insertions, 3 deletions
@@ -3856,9 +3856,12 @@ try_replace_reg (rtx from, rtx to, rtx insn) && validate_change (insn, &SET_SRC (set), src, 0)) success = 1; - /* If we've failed to do replacement, have a single SET, and don't already - have a note, add a REG_EQUAL note to not lose information. */ - if (!success && note == 0 && set != 0) + /* If we've failed to do replacement, have a single SET, don't already + have a note, and have no special SET, add a REG_EQUAL note to not + lose information. */ + if (!success && note == 0 && set != 0 + && GET_CODE (XEXP (set, 0)) != ZERO_EXTRACT + && GET_CODE (XEXP (set, 0)) != SIGN_EXTRACT) note = set_unique_reg_note (insn, REG_EQUAL, copy_rtx (src)); } |