ChangeLog:

	* combine.c (if_then_else_cond): Check for NULL return value of
	simplify_gen_subreg.

testsuite/ChangeLog:

	* gcc.dg/20040310-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@79347 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 34 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/20040310-1.c b/gcc/testsuite/gcc.dg/20040310-1.c
new file mode 100644
index 00000000000..104e98d0889
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/20040310-1.c
@@ -0,0 +1,34 @@
+/* This caused cc1 to segfault on s390x-ibm-linux
+   due to a bug in if_then_else_cond (combine.c).  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+extern void use (unsigned int x);
+
+int main (void)
+{
+  union 
+    {
+      unsigned int x;
+      unsigned long pad;
+    } A;
+
+  struct 
+    {
+      unsigned int x : 1;
+    } B;
+
+  A.x = 1;
+  B.x = 1;
+  A.x /= B.x;
+  use (A.x);
+
+  A.x = 1;
+  B.x = 1;
+  B.x /= A.x;
+  use (B.x);
+
+  return 0;
+}
+