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tree-ssa-structalias.c (find_func_aliases): For memset use a constraint from NULL if we memset to zero.

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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
This commit is contained in:
Richard Guenther 2009-06-20 12:03:16 +00:00 committed by Richard Biener
parent 8a45323c16
commit 825be69e34
3 changed files with 59 additions and 6 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
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.
2009-06-20 Richard Guenther <rguenther@suse.de>
PR tree-optimization/40495

43
gcc/tree-ssa-alias.c
View File

@ -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:

13
gcc/tree-ssa-structalias.c
View File

@ -3674,8 +3674,17 @@ find_func_aliases (gimple origt)
}
get_constraint_for_ptr_offset (dest, NULL_TREE, &lhsc);
do_deref (&lhsc);
ac.type = SCALAR;
ac.var = integer_id;
if (flag_delete_null_pointer_checks
&& integer_zerop (gimple_call_arg (t, 1)))
{
ac.type = ADDRESSOF;
ac.var = nothing_id;
}
else
{
ac.type = SCALAR;
ac.var = integer_id;
}
ac.offset = 0;
for (i = 0; VEC_iterate (ce_s, lhsc, i, lhsp); ++i)
process_constraint (new_constraint (*lhsp, ac));