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| author | Richard Biener <rguenther@suse.de> | 2024-02-01 13:54:11 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2024-02-05 08:35:32 +0100 |
| commit | 5b281946c4b51132caf5e5b64c730fef92dd6123 (patch) | |
| tree | 92dee87e545e944eaf565a0aae625aead1bcfec3 | |
| parent | 91e09b3a7e9c86bb29fc138744fd2e087216733c (diff) | |
| download | gcc-5b281946c4b51132caf5e5b64c730fef92dd6123.zip gcc-5b281946c4b51132caf5e5b64c730fef92dd6123.tar.gz gcc-5b281946c4b51132caf5e5b64c730fef92dd6123.tar.bz2 | |
target/113255 - avoid REG_POINTER on a pointer difference
The following avoids re-using a register holding a pointer (and
thus might be REG_POINTER) for the result of a pointer difference
computation. That might confuse heuristics in (broken) RTL alias
analysis which relies on REG_POINTER indicating that we're
dealing with one.
This alone doesn't fix anything.
PR target/113255
* config/i386/i386-expand.cc
(expand_set_or_cpymem_prologue_epilogue_by_misaligned_moves):
Use a new pseudo for the skipped number of bytes.
| -rw-r--r-- | gcc/config/i386/i386-expand.cc | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc index 5706220..50f9fe2 100644 --- a/gcc/config/i386/i386-expand.cc +++ b/gcc/config/i386/i386-expand.cc @@ -8429,7 +8429,7 @@ expand_set_or_cpymem_prologue_epilogue_by_misaligned_moves (rtx destmem, rtx src /* See how many bytes we skipped. */ saveddest = expand_simple_binop (GET_MODE (*destptr), MINUS, saveddest, *destptr, - saveddest, 1, OPTAB_DIRECT); + NULL_RTX, 1, OPTAB_DIRECT); /* Adjust srcptr and count. */ if (!issetmem) *srcptr = expand_simple_binop (GET_MODE (*srcptr), MINUS, *srcptr, |