[Patch testsuite] Skip gcc.dg/ifcvt-4.c for targets on which it may not work

[James Greenhalgh <james.greenhalgh@arm.com>]

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Hi,

PR68232 is a testsuite failure for targets with very low branch costs.
As the test is looking for if-conversion, it will fail for any subtarget
for which the cost of a branch is sufficiently low that if-conversion looks
more expensive.

In the current implementation this will be any subtarget with an unpredictable
 branch cost of 0 or 1. I had thought this would be very few targets, but
at least powerpc64le and arm can trigger this for particular tuning targets.

This patch skips the test on those targets.

OK?

Thanks,
James

---
2015-12-17  James Greenhalgh  <james.greenhalgh@arm.com>

	PR testsuite/68232
	* gcc.dg/ifcvt-4.c: Skip for arm*-*-* and powerpc64le*-*-*.


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diff --git a/gcc/testsuite/gcc.dg/ifcvt-4.c b/gcc/testsuite/gcc.dg/ifcvt-4.c
index 16be2b0..e1c81fb 100644
--- a/gcc/testsuite/gcc.dg/ifcvt-4.c
+++ b/gcc/testsuite/gcc.dg/ifcvt-4.c
@@ -1,4 +1,6 @@
 /* { dg-options "-fdump-rtl-ce1 -O2" } */
+/* { dg-skip-if "Multiple set if-conversion not guaranteed on all subtargets" { "arm*-*-* powerpc64le*-*-*" } {"*"} { "" } }  */
+
 int
 foo (int x, int y, int a)
 {

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