diff options
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index d52a8f42759..fa086b0a793 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -1518,6 +1518,7 @@ 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_POSIX_MEMALIGN: case BUILT_IN_CALLOC: case BUILT_IN_ALLOCA: case BUILT_IN_ALLOCA_WITH_ALIGN: @@ -1841,6 +1842,18 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref) case BUILT_IN_ALLOCA_WITH_ALIGN: case BUILT_IN_ASSUME_ALIGNED: return false; + /* But posix_memalign stores a pointer into the memory pointed to + by its first argument. */ + case BUILT_IN_POSIX_MEMALIGN: + { + tree ptrptr = gimple_call_arg (call, 0); + ao_ref dref; + ao_ref_init_from_ptr_and_size (&dref, ptrptr, + TYPE_SIZE_UNIT (ptr_type_node)); + return (refs_may_alias_p_1 (&dref, ref, false) + || (flag_errno_math + && targetm.ref_may_alias_errno (ref))); + } /* Freeing memory kills the pointed-to memory. More importantly the call has to serve as a barrier for moving loads and stores across it. */ |