On Tue, 27 May 2014, Richard Biener wrote:
> On Tue, 27 May 2014, Steven Bosscher wrote:
>
> > On Tue, May 27, 2014 at 12:27 PM, Richard Biener wrote:
> > > * tree-vrp.c
> > > (vrp_evaluate_conditional_warnv_with_ops_using_ranges):
> > > Try using literal operands when comparing value-ranges failed.
> >
> > No test case?
>
> Sorry ;) Happens to patches I uncover in my dev tree. I'll try
> to come up with sth (I remember coding it when workin on some
> PR ... but I've lost track of which one).
Here is one (yeah, a bit artificial ...).
Committed.
Richard.
2014-05-27 Richard Biener
* gcc.dg/tree-ssa/vrp92.c: New testcase.
Index: gcc/testsuite/gcc.dg/tree-ssa/vrp92.c
===
--- gcc/testsuite/gcc.dg/tree-ssa/vrp92.c (revision 0)
+++ gcc/testsuite/gcc.dg/tree-ssa/vrp92.c (working copy)
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-vrp1-details" } */
+
+void bar (void);
+int foo (int i, int j)
+{
+ int res = 1;
+ if (i < j)
+{
+ /* We should be able to simplify the following conditional
+ during propagation. */
+ if (i > j)
+ res = 0;
+}
+ /* And compute res as having a value-range of [1,1]. */
+ if (res)
+return i;
+ return j;
+}
+
+/* { dg-final { scan-tree-dump "res_.: \\\[1, 1\\\]" "vrp1" } } */
+/* { dg-final { scan-tree-dump-not "Threaded" "vrp1" } } */
+/* { dg-final { cleanup-tree-dump "vrp1" } } */
