x86: use nop cpu directives only if supported

nasm does not support 'CPU foonop' directives.  This adds a configure
test for the directive and uses it only if supported.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/configure b/configure
index e9058d4c45..a97198c9ef 100755
--- a/configure
+++ b/configure
@@ -1084,6 +1084,7 @@ HAVE_LIST="
     closesocket
     cmov
     cpuid
+    cpunop
     dcbzl
     dev_bktr_ioctl_bt848_h
     dev_bktr_ioctl_meteor_h
@@ -2889,6 +2890,7 @@ EOF
             die "yasm not found, use --disable-yasm for a crippled build"
         check_yasm "vextractf128 xmm0, ymm0, 0" || disable avx
         check_yasm "vfmaddps ymm0, ymm1, ymm2, ymm3" || disable fma4
+        check_yasm "CPU amdnop" && enable cpunop
     fi
 
     case "$cpu" in