diff options
| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-10-16 21:20:32 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1999-10-16 21:20:32 +0000 |
| commit | b7e887dcfdbba2fba4c18f8198cd4adc17bc7f8d (patch) | |
| tree | f40ce2016ed5a83575643e200970d49d5da03e5c /gcc | |
| parent | bdd6c980ac6cc17c4d41ffec205be847dade7b4c (diff) | |
Sat Oct 16 00:07:01 1999 Richard Henderson <rth@cygnus.com>
* gcse.c (hash_expr_1): Add in MEM_ALIAS_SET.
(expr_equiv_p): Reject memories with different alias sets.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-2_95-branch@30047 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/gcse.c | 9 |
2 files changed, 15 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 14b9cffc274..7e6b3e08d83 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +Sat Oct 16 15:20:15 1999 Jeffrey A Law (law@cygnus.com) + + Sat Oct 16 00:07:01 1999 Richard Henderson <rth@cygnus.com> + * gcse.c (hash_expr_1): Add in MEM_ALIAS_SET. + (expr_equiv_p): Reject memories with different alias sets. + Wed Oct 13 01:46:14 1999 Jeffrey A Law (law@cygnus.com) Wed Oct 13 01:44:29 1999 Carol LePage <carolo@hal.com> diff --git a/gcc/gcse.c b/gcc/gcse.c index deebc73e0a1..cddd7ac63df 100644 --- a/gcc/gcse.c +++ b/gcc/gcse.c @@ -1394,6 +1394,7 @@ hash_expr_1 (x, mode, do_not_record_p) return 0; } hash += (unsigned) MEM; + hash += MEM_ALIAS_SET (x); x = XEXP (x, 0); goto repeat; @@ -1526,6 +1527,14 @@ expr_equiv_p (x, y) case REG: return REGNO (x) == REGNO (y); + case MEM: + /* Can't merge two expressions in different alias sets, since we can + decide that the expression is transparent in a block when it isn't, + due to it being set with the different alias set. */ + if (MEM_ALIAS_SET (x) != MEM_ALIAS_SET (y)) + return 0; + break; + /* For commutative operations, check both orders. */ case PLUS: case MULT: |