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[PATCH] Tweak tree-ssa/pr81588.c testcase (PR tree-optimization/81655)


I have an improvement that handles tree-ssa/pr81588.c optimization
even on branch cost 1, but as it is effectively an extension to the
range var_bound optimization, I'm not sure it should be backported.

Therefore, this patch treats this testcase similarly to other
testcases that rely on branch cost of 2 (so that there is BIT_IOR_EXPR
and not 2 separate jumps).

Tested on x86_64-linux, ok for 7.2?

2017-08-02  Jakub Jelinek  <>

	PR tree-optimization/81655
	PR tree-optimization/81588
	* gcc.dg/tree-ssa/pr81588.c: Use -mbranch-cost=2 where possible,
	don't run the test on branch-cost=1 targets.

--- gcc/testsuite/gcc.dg/tree-ssa/pr81588.c.jj	2017-08-01 10:28:50.000000000 +0200
+++ gcc/testsuite/gcc.dg/tree-ssa/pr81588.c	2017-08-02 11:02:30.966184545 +0200
@@ -1,7 +1,8 @@
 /* PR tree-optimization/81588 */
-/* { dg-do compile } */
+/* { dg-do compile { target { ! "m68k*-*-* mmix*-*-* bfin*-*-* v850*-*-* moxie*-*-* cris*-*-* m32c*-*-* fr30*-*-* mcore*-*-* powerpc*-*-* xtensa*-*-* hppa*-*-* nios2*-*-*" } } } */
 /* { dg-options "-O2 -fdump-tree-reassoc1-details" } */
+/* { dg-additional-options "-mbranch-cost=2" { target mips*-*-* avr-*-* s390*-*-* i?86-*-* x86_64-*-* } } */
 extern long long int a, c;
 extern unsigned short b;


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