2007-10-12 Richard Guenther <rguenther@suse.de>

	PR middle-end/26198
	* tree-ssa-forwprop.c (can_propagate_from): Do not propagate from
	a rhs with side-effects or which is a load.
	(forward_propagate_into_cond): Also try combining both operands.

	* gcc.dg/tree-ssa/forwprop-3.c: New testcase.
	* gcc.c-torture/execute/20071011-1.c: Likewise.
	* gcc.dg/tree-ssa/ssa-pre-9.c: Adjust.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@129256 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/execute/20071011-1.c b/gcc/testsuite/gcc.c-torture/execute/20071011-1.c
new file mode 100644
index 00000000000..631658540b3
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20071011-1.c
@@ -0,0 +1,19 @@
+extern void abort(void);
+void foo(int *p)
+{
+  int x;
+  int y;
+  x = *p;
+  *p = 0;
+  y = *p;
+  if (x != y)
+    return;
+  abort ();
+}
+
+int main()
+{
+  int a = 1;
+  foo(&a);
+  return 0;
+}