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re PR middle-end/20493 (Bootstrap failure because of aliased symbols)

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PR middle-end/20493
	* fold-const.c (fold_widened_comparison): Don't optimize casts of
	function pointers on targets that require function pointer
	canonicalization.
	(fold_sign_changed_comparison): Likewise.

From-SVN: r96733
This commit is contained in:
John David Anglin 2005-03-19 16:45:59 +00:00 committed by John David Anglin
parent 1ad93fbfe9
commit 6c6d9d33ef
2 changed files with 26 additions and 0 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2005-03-19 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
PR middle-end/20493
* fold-const.c (fold_widened_comparison): Don't optimize casts of
function pointers on targets that require function pointer
canonicalization.
(fold_sign_changed_comparison): Likewise.
2005-03-19 Bernd Schmidt <bernd.schmidt@analog.com>
* combine.c (try_combine): When changing the mode of a hard reg, make

18
gcc/fold-const.c
View File

@ -6074,6 +6074,15 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1)
return NULL_TREE;
shorter_type = TREE_TYPE (arg0_unw);
#ifdef HAVE_canonicalize_funcptr_for_compare
/* Disable this optimization if we're casting a function pointer
type on targets that require function pointer canonicalization. */
if (HAVE_canonicalize_funcptr_for_compare
&& TREE_CODE (shorter_type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (shorter_type)) == FUNCTION_TYPE)
return NULL_TREE;
#endif
if (TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (shorter_type))
return NULL_TREE;
@ -6156,6 +6165,15 @@ fold_sign_changed_comparison (enum tree_code code, tree type,
arg0_inner = TREE_OPERAND (arg0, 0);
inner_type = TREE_TYPE (arg0_inner);
#ifdef HAVE_canonicalize_funcptr_for_compare
/* Disable this optimization if we're casting a function pointer
type on targets that require function pointer canonicalization. */
if (HAVE_canonicalize_funcptr_for_compare
&& TREE_CODE (inner_type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (inner_type)) == FUNCTION_TYPE)
return NULL_TREE;
#endif
if (TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type))
return NULL_TREE;