Older assemblers don't speak SSE3. Add a configure test for it.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@6655 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index d4aff70..5fcb8f6 100644
--- a/configure.in
+++ b/configure.in
@@ -743,6 +743,26 @@
fi
+# does the x86/amd64 assembler understand SSE3 instructions?
+AC_MSG_CHECKING([if x86/amd64 assembler speaks SSE3])
+
+AC_TRY_COMPILE(, [
+ do { long long int x;
+ __asm__ __volatile__("fisttpq (%0)" : :"r"(&x) ); }
+ while (0)
+],
+[
+ac_have_as_sse3=yes
+AC_MSG_RESULT([yes])
+], [
+ac_have_as_sse3=no
+AC_MSG_RESULT([no])
+])
+if test x$ac_have_as_sse3 = xyes ; then
+ AC_DEFINE(HAVE_AS_SSE3, 1, [Define to 1 if x86/amd64 as supports SSE3.])
+fi
+
+
# Check for TLS support in the compiler and linker
AC_CACHE_CHECK([for TLS support], vg_cv_tls,
[AC_ARG_ENABLE(tls, [ --enable-tls platform supports TLS],