diff options
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-ssa-alias.c | 5 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6a59bd5..6319ca9 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2009-12-04 Richard Guenther <rguenther@suse.de> + + * tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Handle + BUILT_IN_MALLOC. + (call_may_clobber_ref_p_1): Likewise. + 2009-12-04 Matthias Klose <doko@ubuntu.com> John David Anglin <dave.anglin@nrc-cnrc.gc.ca> diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index e713708..cbb43b5 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -963,6 +963,7 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref) } /* The following builtins do not read from memory. */ case BUILT_IN_FREE: + case BUILT_IN_MALLOC: case BUILT_IN_MEMSET: case BUILT_IN_FREXP: case BUILT_IN_FREXPF: @@ -1187,6 +1188,10 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref) size); return refs_may_alias_p_1 (&dref, ref, false); } + /* Allocating memory does not have any side-effects apart from + being the definition point for the pointer. */ + case BUILT_IN_MALLOC: + return false; /* Freeing memory kills the pointed-to memory. More importantly the call has to serve as a barrier for moving loads and stores across it. */ |