Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 33 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c
new file mode 100644
index 000000000..76e2004b0
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-5.c
@@ -0,0 +1,33 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+int x; 
+ 
+int 
+f1 (int i, int j, int k) 
+{ 
+  int *p = k ? &i : &j; 
+  i = 3;
+  *p = 5; 
+  x = j; 
+} 
+
+/* The assignment "i = 3" is partially dead.  Our DSE pass doesn't handle
+   detection of partially dead assignments.
+
+   There's two outputs which would indicate that the optimization was
+   performed.
+
+   If we used block copying to detect and eliminate the partially dead
+   store, then we should see an assignment "i = 5" somewhere in the
+   dump file.
+
+   Another approach would be to redirect the path from the true arm
+   of the first conditional so that it reaches the statement *p = 5
+   rather than i = 3.  */
+
+/* { dg-final { scan-tree-dump-times "i = 5" 1 "optimized" { xfail *-*-* }} } */
+/* { dg-final { scan-tree-dump-times "<L.*>:;\[\n\t \]*\\*p = 5" 1 "optimized" { xfail *-*-*}} } */
+
+/* { dg-final { cleanup-tree-dump "optimized" } } */
+