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| author | Richard Guenther <rguenther@suse.de> | 2009-06-20 12:03:16 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-06-20 12:03:16 +0000 |
| commit | 825be69e343144b0608da6056d92dc5b71eb50c2 (patch) | |
| tree | 184a74dea43f320ee54cbce63562ba24f77061d9 /gcc/tree-ssa-alias.c | |
| parent | 8a45323c1634094c568274d44f4780550708589c (diff) | |
| download | gcc-825be69e343144b0608da6056d92dc5b71eb50c2.zip gcc-825be69e343144b0608da6056d92dc5b71eb50c2.tar.gz gcc-825be69e343144b0608da6056d92dc5b71eb50c2.tar.bz2 | |
tree-ssa-structalias.c (find_func_aliases): For memset use a constraint from NULL if we memset to zero.
2009-06-20 Richard Guenther <rguenther@suse.de>
* tree-ssa-structalias.c (find_func_aliases): For memset use
a constraint from NULL if we memset to zero.
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Add builtins
we explicitly handle that do not read from memory.
(call_may_clobber_ref_p_1): Properly handle builtins that may
set errno.
From-SVN: r148747
Diffstat (limited to 'gcc/tree-ssa-alias.c')
| -rw-r--r-- | gcc/tree-ssa-alias.c | 43 |
1 files changed, 39 insertions, 4 deletions
diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index c83488b..9895524 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -899,6 +899,29 @@ ref_maybe_used_by_call_p_1 (gimple call, tree ref) tree src = gimple_call_arg (call, 1); return ptr_deref_may_alias_ref_p (src, ref); } + /* The following builtins do not read from memory. */ + case BUILT_IN_FREE: + case BUILT_IN_MEMSET: + case BUILT_IN_FREXP: + case BUILT_IN_FREXPF: + case BUILT_IN_FREXPL: + case BUILT_IN_GAMMA_R: + case BUILT_IN_GAMMAF_R: + case BUILT_IN_GAMMAL_R: + case BUILT_IN_LGAMMA_R: + case BUILT_IN_LGAMMAF_R: + case BUILT_IN_LGAMMAL_R: + case BUILT_IN_MODF: + case BUILT_IN_MODFF: + case BUILT_IN_MODFL: + case BUILT_IN_REMQUO: + case BUILT_IN_REMQUOF: + case BUILT_IN_REMQUOL: + case BUILT_IN_SINCOS: + case BUILT_IN_SINCOSF: + case BUILT_IN_SINCOSL: + return false; + default: /* Fallthru to general call handling. */; } @@ -1060,15 +1083,23 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref) tree ptr = gimple_call_arg (call, 0); return ptr_deref_may_alias_ref_p_1 (ptr, ref); } - case BUILT_IN_FREXP: - case BUILT_IN_FREXPF: - case BUILT_IN_FREXPL: case BUILT_IN_GAMMA_R: case BUILT_IN_GAMMAF_R: case BUILT_IN_GAMMAL_R: case BUILT_IN_LGAMMA_R: case BUILT_IN_LGAMMAF_R: case BUILT_IN_LGAMMAL_R: + { + tree out = gimple_call_arg (call, 1); + if (ptr_deref_may_alias_ref_p_1 (out, ref)) + return true; + if (flag_errno_math) + break; + return false; + } + case BUILT_IN_FREXP: + case BUILT_IN_FREXPF: + case BUILT_IN_FREXPL: case BUILT_IN_MODF: case BUILT_IN_MODFF: case BUILT_IN_MODFL: @@ -1081,7 +1112,11 @@ call_may_clobber_ref_p_1 (gimple call, ao_ref *ref) case BUILT_IN_REMQUOL: { tree out = gimple_call_arg (call, 2); - return ptr_deref_may_alias_ref_p_1 (out, ref); + if (ptr_deref_may_alias_ref_p_1 (out, ref)) + return true; + if (flag_errno_math) + break; + return false; } case BUILT_IN_SINCOS: case BUILT_IN_SINCOSF: |