This adds the second testcase which we now also handle eliminating
a redundant PHI node.
Tested on x86_64-unknown-linux-gu.
2022-01-03 Richard Biener <rguent...@suse.de>
PR tree-optimization/66502
* gcc.dg/tree-ssa/ssa-fre-98.c: New testcase.
---
gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-98.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-98.c
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-98.c
b/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-98.c
new file mode 100644
index 00000000000..3d286099b25
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-98.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-fre1-details" } */
+
+int foo (int a, int s, unsigned int k)
+{
+ int i = a, j = a;
+ do
+ {
+ i += s;
+ j += j;
+ j -= a;
+ }
+ while (k--);
+ return j+i;
+}
+
+/* We want the redundant PHI for j to disappear. */
+/* { dg-final { scan-tree-dump "Replaced redundant PHI node defining j" "fre1"
} } */
--
2.31.1
