PR rtl-optimization/24899

	* loop.c (strength_reduce): Don't reduce giv that is not always
	computable and where add_val or mult_val can trap.

	* gcc.c-torture/execute/20051215-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@108642 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/execute/20051215-1.c b/gcc/testsuite/gcc.c-torture/execute/20051215-1.c
new file mode 100644
index 00000000000..143a449d080
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20051215-1.c
@@ -0,0 +1,28 @@
+/* PR rtl-optimization/24899 */
+
+extern void abort (void);
+
+__attribute__ ((noinline)) int
+foo (int x, int y, int *z)
+{
+  int a, b, c, d;
+
+  a = b = 0;
+  for (d = 0; d < y; d++)
+    {
+      if (z)
+	b = d * *z;
+      for (c = 0; c < x; c++)
+	a += b;
+    }
+
+  return a;
+}
+
+int
+main (void)
+{
+  if (foo (3, 2, 0) != 0)
+    abort ();
+  return 0;
+}