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re PR middle-end/17564 (New treatment of function pointers when used with equality operators, when casts are involved)

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PR middle-end/17564
	* dojump.c (do_compare_and_jump): Only canonicalize function pointers
	in a comparison if both sides are function pointers.

Co-Authored-By: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>

From-SVN: r92061
This commit is contained in:
Nathanael Nerode 2004-12-12 21:01:17 +00:00 committed by John David Anglin
parent 25da5dc7c6
commit b8c26d709c
2 changed files with 17 additions and 11 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-12-12 Nathanael Nerode <neroden@gcc.gnu.org>
John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
PR middle-end/17564
* dojump.c (do_compare_and_jump): Only canonicalize function pointers
in a comparison if both sides are function pointers.
2004-12-12 Richard Henderson <rth@redhat.com>
PR target/18932

21
gcc/dojump.c
View File

@ -904,24 +904,23 @@ do_compare_and_jump (tree exp, enum rtx_code signed_code,
#ifdef HAVE_canonicalize_funcptr_for_compare
/* If function pointers need to be "canonicalized" before they can
be reliably compared, then canonicalize them. */
be reliably compared, then canonicalize them.
Only do this if *both* sides of the comparison are function pointers.
If one side isn't, we want a noncanonicalized comparison. See PR
middle-end/17564. */
if (HAVE_canonicalize_funcptr_for_compare
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == POINTER_TYPE
&& (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
== FUNCTION_TYPE))
&& TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0))))
== FUNCTION_TYPE
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
== FUNCTION_TYPE)
{
rtx new_op0 = gen_reg_rtx (mode);
rtx new_op1 = gen_reg_rtx (mode);
emit_insn (gen_canonicalize_funcptr_for_compare (new_op0, op0));
op0 = new_op0;
}
if (HAVE_canonicalize_funcptr_for_compare
&& TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 1))) == POINTER_TYPE
&& (TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 1))))
== FUNCTION_TYPE))
{
rtx new_op1 = gen_reg_rtx (mode);
emit_insn (gen_canonicalize_funcptr_for_compare (new_op1, op1));
op1 = new_op1;