From 4a18bbc5501fe39706b6fbda8419cd3ccd3f9070 Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Fri, 6 Oct 2017 17:23:02 +0100
Subject: [PATCH] another try at testing for working vectors

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 0fefa5e9..ad7a201e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -373,7 +373,7 @@ if test x$have_vector_shuffle = x"yes"; then
   AC_TRY_COMPILE([
     typedef float v4f __attribute__((vector_size(4 * sizeof(float))));
   ],[
-    v4f f = {1, 2, 3, 4}; f *= 12.0; f *= -1; 
+    v4f f = {1, 2, 3, 4}; f *= 12.0; f = f > 0 ? f : -1 * f;
   ],[
     AC_MSG_RESULT([yes])
     have_vector_arith=yes