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re PR middle-end/79818 (wrong code with -fwrapv and -Os/-O1/-O2/-O3) 

2017-03-03  Richard Biener  <rguenther@suse.de>

	PR middle-end/79818
	* match.pd ( X +- C1 CMP C2 -> X CMP C2 -+ C1): Add missing
	TYPE_OVERFLOW_UNDEFINED check.

	* gcc.dg/torture/pr79818.c: New testcase.

From-SVN: r245860
This commit is contained in:
Richard Biener 2017-03-03 08:08:08 +00:00 committed by Richard Biener
parent fb5ce60890
commit 75473a91bc
4 changed files with 32 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2017-03-03 Richard Biener <rguenther@suse.de>
PR middle-end/79818
* match.pd ( X +- C1 CMP C2 -> X CMP C2 -+ C1): Add missing
TYPE_OVERFLOW_UNDEFINED check.
2017-03-02 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
* config/rs6000/vector.md (vector_ne_<mode>_p): Correct operand

3
gcc/match.pd
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@ -3688,7 +3688,8 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
&& !TYPE_OVERFLOW_TRAPS (TREE_TYPE (@0))
&& !TYPE_SATURATING (TREE_TYPE (@0)))
(with { tree res = int_const_binop (rop, @2, @1); }
(if (TREE_OVERFLOW (res))
(if (TREE_OVERFLOW (res)
&& TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))
{ constant_boolean_node (cmp == NE_EXPR, type); }
(if (single_use (@3))
(cmp @0 { res; }))))))))

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2017-03-03 Richard Biener <rguenther@suse.de>
PR middle-end/79818
* gcc.dg/torture/pr79818.c: New testcase.
2017-03-02 Jakub Jelinek <jakub@redhat.com>
PR c++/79782

19
gcc/testsuite/gcc.dg/torture/pr79818.c Normal file
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@ -0,0 +1,19 @@
/* { dg-do run } */
/* { dg-additional-options "-fwrapv" } */
static void __attribute__((noinline,noclone))
func(void)
{
signed char c = 0;
for(; c >= 0; c++);
if(c != -128)
__builtin_abort();
}
int main(int argc, char* argv[])
{
func();
return 0;
}