--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/tree-ssa/negneg-1.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-options "-O -frounding-math -fdump-tree-optimized-raw -Wno-psabi" } */
+
+#define DEF(num, T1, T2) T2 f##num(T1 x) { \
+    T1 y = -x; \
+    T2 z = (T2)y; \
+    return -z; \
+}
+DEF(0, int, long long)
+DEF(1, int, unsigned long long)
+DEF(2, long long, int)
+DEF(3, unsigned long long, int)
+DEF(4, long long, unsigned)
+DEF(5, unsigned long long, unsigned)
+DEF(6, float, double)
+
+typedef int vec __attribute__((vector_size(4*sizeof(int))));
+typedef unsigned uvec __attribute__((vector_size(4*sizeof(int))));
+void h(vec*p,uvec*q){
+    vec a = -*p;
+    *q = -(uvec)a;
+}
+
+/* { dg-final { scan-tree-dump-not "negate_expr" "optimized"} } */