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| author | Jakub Jelinek <jakub@redhat.com> | 2010-04-16 11:26:43 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2010-04-16 11:26:43 +0200 |
| commit | 5312b0660e6f24145896e84382d184c16c884bf1 (patch) | |
| tree | 1728270296344efa111f7dd12bbe6946f34b601b /gcc/alias.c | |
| parent | d5cc2ee390b7ff74f41ec95aca7510c172c78da0 (diff) | |
| download | gcc-5312b0660e6f24145896e84382d184c16c884bf1.zip gcc-5312b0660e6f24145896e84382d184c16c884bf1.tar.gz gcc-5312b0660e6f24145896e84382d184c16c884bf1.tar.bz2 | |
alias.c (memrefs_conflict_p): If x and y are the same VALUE, don't call get_addr on both.
* alias.c (memrefs_conflict_p): If x and y are the same VALUE,
don't call get_addr on both. If one expression is a VALUE and
the other a REG, check VALUE's locs if the REG isn't among them.
From-SVN: r158401
Diffstat (limited to 'gcc/alias.c')
| -rw-r--r-- | gcc/alias.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/gcc/alias.c b/gcc/alias.c index 4be7085..6ec51ec 100644 --- a/gcc/alias.c +++ b/gcc/alias.c @@ -1789,9 +1789,39 @@ static int memrefs_conflict_p (int xsize, rtx x, int ysize, rtx y, HOST_WIDE_INT c) { if (GET_CODE (x) == VALUE) - x = get_addr (x); + { + if (REG_P (y)) + { + struct elt_loc_list *l; + for (l = CSELIB_VAL_PTR (x)->locs; l; l = l->next) + if (REG_P (l->loc) && rtx_equal_for_memref_p (l->loc, y)) + break; + if (l) + x = y; + else + x = get_addr (x); + } + /* Don't call get_addr if y is the same VALUE. */ + else if (x != y) + x = get_addr (x); + } if (GET_CODE (y) == VALUE) - y = get_addr (y); + { + if (REG_P (x)) + { + struct elt_loc_list *l; + for (l = CSELIB_VAL_PTR (y)->locs; l; l = l->next) + if (REG_P (l->loc) && rtx_equal_for_memref_p (l->loc, x)) + break; + if (l) + y = x; + else + y = get_addr (y); + } + /* Don't call get_addr if x is the same VALUE. */ + else if (y != x) + y = get_addr (y); + } if (GET_CODE (x) == HIGH) x = XEXP (x, 0); else if (GET_CODE (x) == LO_SUM) |