Backport from mainline.

	PR 27363
	gcc/
	* cse.c (cse_insn): Add destination addresses to hash table. Check if
	they are invalidated by this instruction.

	gcc/testsuite/
	* gcc.dg/pr27363.c: New test.



git-svn-id: https://gcc.gnu.org/svn/gcc/branches/csl/sourcerygxx-4_1@115616 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 39 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/pr27363.c b/gcc/testsuite/gcc.dg/pr27363.c
new file mode 100644
index 00000000000..40a3c6b3526
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr27363.c
@@ -0,0 +1,39 @@
+/* PR27363.  CSE was breaking on the arm store multiple insn used for
+   structure copies.  */
+/* { dg-do run } */
+/* { dg-options "-Os" } */
+extern void abort (void);
+
+struct snd_mask {
+    unsigned int bits[6];
+};
+
+static int __attribute__((noinline))
+snd_mask_refine(struct snd_mask *mask)
+{
+  struct snd_mask old;
+
+  old = *mask;
+  if (mask->bits[0]==0 && mask->bits[1]==0)
+    return 1;
+
+  return old.bits[0] != mask->bits[0];
+}
+
+int main(int argc, char *argv[])
+{
+  struct snd_mask mask;
+
+
+  mask.bits[0] = 23;
+  mask.bits[1] = 42;
+  mask.bits[2] = 0;
+  mask.bits[3] = 0;
+  mask.bits[4] = 0; 
+  mask.bits[5] = 0;
+
+
+  if (snd_mask_refine(&mask))
+    abort();
+  return 0;
+}