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| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-01-24 02:23:54 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-01-24 02:23:54 +0000 |
| commit | a476dbbe50772db09e589a2f226eef48e49900a4 (patch) | |
| tree | 31f209b5414359b26dd62c5d1d1950f8d20b6d29 | |
| parent | f41715af5f36952a9719aa68fc52cb82bbb925de (diff) | |
| download | ppe42-gcc-a476dbbe50772db09e589a2f226eef48e49900a4.tar.gz ppe42-gcc-a476dbbe50772db09e589a2f226eef48e49900a4.zip | |
* flow.c (init_propagate_block_info): Don't consider unchanging
memories for dead frame store elimination.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@39222 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/flow.c | 7 |
2 files changed, 12 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 602dd5fa7e4..a1ca492a17c 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,10 @@ 2001-01-23 Richard Henderson <rth@redhat.com> + * flow.c (init_propagate_block_info): Don't consider unchanging + memories for dead frame store elimination. + +2001-01-23 Richard Henderson <rth@redhat.com> + * varasm.c (UNIQUE_SECTION): Move default implementation ... * defaults.h: ... here. diff --git a/gcc/flow.c b/gcc/flow.c index 2e76e3d398f..00529d9d5e8 100644 --- a/gcc/flow.c +++ b/gcc/flow.c @@ -4100,6 +4100,13 @@ init_propagate_block_info (bb, live, local_set, cond_local_set, flags) { rtx mem = SET_DEST (PATTERN (insn)); + /* This optimization is performed by faking a store to the + memory at the end of the block. This doesn't work for + unchanging memories because multiple stores to unchanging + memory is illegal and alias analysis doesn't consider it. */ + if (RTX_UNCHANGING_P (mem)) + continue; + if (XEXP (mem, 0) == frame_pointer_rtx || (GET_CODE (XEXP (mem, 0)) == PLUS && XEXP (XEXP (mem, 0), 0) == frame_pointer_rtx |
