From 5ea4e32525e2e367352b23e38021f9b43672a980 Mon Sep 17 00:00:00 2001
From: Florian Krohm <florian@eich-krohm.de>
Date: Fri, 12 Dec 2014 17:44:36 +0000
Subject: [PATCH] Update detection of tool-chain support for MPX insns to
 better work for older assemblers. Pertains to BZ #339542.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14805
---
 configure.ac | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 11986775dc..1298b293c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2260,7 +2260,10 @@ AM_CONDITIONAL(BUILD_FMA_TESTS, test x$ac_have_as_fma = xyes)
 AC_MSG_CHECKING([if amd64 assembler knows the MPX instructions])
 
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
-  asm ("bndmov %bnd0,(%rsp)")
+  do {
+    asm ("bndmov %bnd0,(%rsp)");
+    asm ("bndldx 3(%rbx,%rdx), %bnd2");
+  } while (0)
 ]])], [
 ac_have_as_mpx=yes
 AC_MSG_RESULT([yes])
-- 
2.47.3