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| author | Richard Henderson <rth@redhat.com> | 2001-01-23 18:23:54 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-01-23 18:23:54 -0800 |
| commit | 240f9c2b138280b1ed94ead778cf68c24a8a48d7 (patch) | |
| tree | 31f209b5414359b26dd62c5d1d1950f8d20b6d29 | |
| parent | fc9f395ad284656571c28d8cbb8e68e93ece4a75 (diff) | |
| download | gcc-240f9c2b138280b1ed94ead778cf68c24a8a48d7.zip gcc-240f9c2b138280b1ed94ead778cf68c24a8a48d7.tar.gz gcc-240f9c2b138280b1ed94ead778cf68c24a8a48d7.tar.bz2 | |
flow.c (init_propagate_block_info): Don't consider unchanging memories for dead frame store elimination.
* flow.c (init_propagate_block_info): Don't consider unchanging
memories for dead frame store elimination.
From-SVN: r39222
| -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 602dd5f..a1ca492 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. @@ -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 |