PR target/17692

        * config/i386/i386.c (ix86_split_sse_movcc): Emit DELETED note
        when expanding to nothing.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102509 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.target/i386/pr17692.c b/gcc/testsuite/gcc.target/i386/pr17692.c
new file mode 100644
index 00000000000..a837386a3f9
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr17692.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O -mfpmath=sse -msse2" } */
+/* The fact that t1 and t2 are uninitialized is critical.  With them
+   uninitialized, the register allocator is free to put them in the same
+   hard register, which results in
+
+	xmm0 = xmm0 >= xmm0 ? xmm0 : xmm0
+
+   Which is of course a nop, but one for which we would ICE splitting the
+   pattern.  */
+   
+double out;
+
+static void foo(void)
+{
+    double t1, t2, t3, t4;
+    
+    t4 = t1 >= t2 ? t1 : t2;
+    t4 = t4 >= t3 ? t4 : t3;
+    out = t4;
+}