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-rw-r--r--gcc/testsuite/gcc.dg/tree-ssa/loop-2.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c
new file mode 100644
index 00000000000..41f42215b85
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-2.c
@@ -0,0 +1,37 @@
+/* A test for strength reduction and induction variable elimination. */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-vars" } */
+
+/* Size of this structure should be sufficiently weird so that no memory
+ addressing mode applies. */
+
+struct bla
+{
+ char x[187];
+ int y;
+ char z[253];
+} arr_base[100];
+
+void xxx(void)
+{
+ int iter;
+
+ for (iter = 0; iter < 100; iter++)
+ arr_base[iter].y = 17 * iter;
+}
+
+/* Access to arr_base[iter].y should be strength reduced. */
+
+/* { dg-final { scan-tree-dump-times "arr_base.*=" 0 "vars" } } */
+
+/* 17 * iter should be strength reduced. */
+
+/* { dg-final { scan-tree-dump-times " \\* 17" 0 "vars" } } */
+/* { dg-final { scan-tree-dump-times " \\+ 17" 1 "vars" } } */
+
+/* The induction variable comparison with 99 should be eliminated
+ and replaced by comparison of the variable for 17 * iter with 1700. */
+
+/* { dg-final { scan-tree-dump-times "1700" 1 "vars" } } */
+/* { dg-final { scan-tree-dump-times "iter" 0 "vars" } } */
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