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| author | krebbel <krebbel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-02-25 15:07:17 +0000 |
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| committer | krebbel <krebbel@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-02-25 15:07:17 +0000 |
| commit | 5fe61d21f7d29781b7f64e44687913e4386668b5 (patch) | |
| tree | fc21b35d3970def7cfb0d7c5ee657f66f97bd3bf /gcc/cse.c | |
| parent | cab0c61281d1a8af3eb8d967b7210fcf9b43dc10 (diff) | |
| download | gcc-5fe61d21f7d29781b7f64e44687913e4386668b5.tar.gz | |
2008-02-25 Andreas Krebbel <krebbel1@de.ibm.com>
PR target/35258
* cse.c (cse_insn): Avoid creation of overlapping MEMs.
* alias.c (nonoverlapping_memrefs_p): Export for use in other modules.
* alias.h (nonoverlapping_memrefs_p): Likewise.
2008-02-25 Andreas Krebbel <krebbel1@de.ibm.com>
PR target/35258
* gcc.dg/pr35258.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@132628 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index f6660e4ff12..9f31e670966 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -4753,6 +4753,23 @@ cse_insn (rtx insn, rtx libcall_insn) src_elt_cost = MAX_COST; } + /* Avoid creation of overlapping memory moves. */ + if (MEM_P (trial) && MEM_P (SET_DEST (sets[i].rtl))) + { + rtx src, dest; + + /* BLKmode moves are not handled by cse anyway. */ + if (GET_MODE (trial) == BLKmode) + break; + + src = canon_rtx (trial); + dest = canon_rtx (SET_DEST (sets[i].rtl)); + + if (!MEM_P (src) || !MEM_P (dest) + || !nonoverlapping_memrefs_p (src, dest)) + break; + } + /* We don't normally have an insn matching (set (pc) (pc)), so check for this separately here. We will delete such an insn below. |