diff options
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index 2df27dd..878d840 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -1314,6 +1314,43 @@ ref_maybe_used_by_call_p_1 (gimple call, ao_ref *ref) size); return refs_may_alias_p_1 (&dref, ref, false); } + /* These read memory pointed to by the first argument. */ + case BUILT_IN_INDEX: + case BUILT_IN_STRCHR: + case BUILT_IN_STRRCHR: + { + ao_ref dref; + ao_ref_init_from_ptr_and_size (&dref, + gimple_call_arg (call, 0), + NULL_TREE); + return refs_may_alias_p_1 (&dref, ref, false); + } + /* These read memory pointed to by the first argument with size + in the third argument. */ + case BUILT_IN_MEMCHR: + { + ao_ref dref; + ao_ref_init_from_ptr_and_size (&dref, + gimple_call_arg (call, 0), + gimple_call_arg (call, 2)); + return refs_may_alias_p_1 (&dref, ref, false); + } + /* These read memory pointed to by the first and second arguments. */ + case BUILT_IN_STRSTR: + case BUILT_IN_STRPBRK: + { + ao_ref dref; + ao_ref_init_from_ptr_and_size (&dref, + gimple_call_arg (call, 0), + NULL_TREE); + if (refs_may_alias_p_1 (&dref, ref, false)) + return true; + ao_ref_init_from_ptr_and_size (&dref, + gimple_call_arg (call, 1), + NULL_TREE); + return refs_may_alias_p_1 (&dref, ref, false); + } + /* The following builtins do not read from memory. */ case BUILT_IN_FREE: case BUILT_IN_MALLOC: |