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re PR tree-optimization/39746 (Fail pr34513.c and pr34513.C at -O1 and above)

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2009-04-17  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/39746
	* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Remove
	special-casing for builtins and static variable use/def.
	(call_may_clobber_ref_p_1): Likewise.

From-SVN: r146240
This commit is contained in:
Richard Guenther 2009-04-17 10:29:26 +00:00 committed by Richard Biener
parent 36c7355262
commit e3ac77ff51
2 changed files with 15 additions and 18 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2009-04-17 Richard Guenther <rguenther@suse.de>
PR tree-optimization/39746
* tree-ssa-alias.c (ref_maybe_used_by_call_p_1): Remove
special-casing for builtins and static variable use/def.
(call_may_clobber_ref_p_1): Likewise.
2009-04-16 Ian Lance Taylor <iant@google.com>
* df.h: Include "timevar.h".

26
gcc/tree-ssa-alias.c
View File

@ -737,7 +737,7 @@ refs_may_alias_p (tree ref1, tree ref2)
static bool
ref_maybe_used_by_call_p_1 (gimple call, tree ref)
{
tree base, fndecl;
tree base;
unsigned i;
int flags = gimple_call_flags (call);
@ -758,14 +758,8 @@ ref_maybe_used_by_call_p_1 (gimple call, tree ref)
cannot possibly use it. */
if (DECL_P (base)
&& !may_be_aliased (base)
/* But local statics can be used through recursion! */
&& (!is_global_var (base)
/* But not via builtins.
??? We just assume that this is true if we are not a
builtin function ourself. */
|| (!DECL_BUILT_IN (cfun->decl)
&& (fndecl = gimple_call_fndecl (call))
&& DECL_BUILT_IN (fndecl))))
/* But local statics can be used through recursion. */
&& !is_global_var (base))
goto process_args;
/* Check if base is a global static variable that is not read
@ -865,7 +859,7 @@ ref_maybe_used_by_stmt_p (gimple stmt, tree ref)
static bool
call_may_clobber_ref_p_1 (gimple call, tree ref)
{
tree fndecl, base;
tree base;
/* If the call is pure or const it cannot clobber anything. */
if (gimple_call_flags (call)
@ -884,15 +878,11 @@ call_may_clobber_ref_p_1 (gimple call, tree ref)
cannot possibly clobber it. */
if (DECL_P (base)
&& !may_be_aliased (base)
/* But local non-readonly statics can be modified through recursion! */
/* But local non-readonly statics can be modified through recursion
or the call may implement a threading barrier which we must
treat as may-def. */
&& (TREE_READONLY (base)
|| !is_global_var (base)
/* But not via builtins.
??? We just assume that this is true if we are not a
builtin function ourself. */
|| (!DECL_BUILT_IN (cfun->decl)
&& (fndecl = gimple_call_fndecl (call))
&& DECL_BUILT_IN (fndecl))))
|| !is_global_var (base)))
return false;
/* Check if base is a global static variable that is not written