From 1882cf1c9d68e0c325c89f0bdf368b47206f19e0 Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Thu, 29 Dec 2011 22:44:16 -0200
Subject: Add detection of AVX and AVX2 support in the compiler.

Intel CC 12.1 supports AVX2 but only with -march=core-avx2. The -mavx2
option produces a warning.

GCC 4.6 does not recognise any option.

GCC 4.7 recognises both -mavx2 and -march=core-avx2 so let's use the
latter for now. We may need to change to -mavx2 when there's an AMD
processor that supports AVX2 too.

Change-Id: I529240e6e6c2c0e3942d357e0320212d954fe4de
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
---
 configure | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'configure')

diff --git a/configure b/configure
index 9e28f8f48c..e4ee9ec32c 100755
--- a/configure
+++ b/configure
@@ -731,6 +731,7 @@ CFG_SSSE3=auto
 CFG_SSE4_1=auto
 CFG_SSE4_2=auto
 CFG_AVX=auto
+CFG_AVX2=auto
 CFG_REDUCE_RELOCATIONS=auto
 CFG_NAS=no
 CFG_ACCESSIBILITY=auto
@@ -1510,6 +1511,13 @@ while [ "$#" -gt 0 ]; do
             UNKNOWN_OPT=yes
         fi
         ;;
+    avx2)
+        if [ "$VAL" = "no" ]; then
+            CFG_AVX2="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
     iwmmxt)
 	CFG_IWMMXT="yes"
 	;;
@@ -3081,6 +3089,7 @@ cat << EOF
     -no-sse4.1.......... Do not compile with use of SSE4.1 instructions.
     -no-sse4.2.......... Do not compile with use of SSE4.2 instructions.
     -no-avx ............ Do not compile with use of AVX instructions.
+    -no-avx2 ........... Do not compile with use of AVX2 instructions.
     -no-neon ........... Do not compile with use of NEON instructions.
     -no-mips_dsp ....... Do not compile with use of MIPS DSP instructions.
     -no-mips_dspr2 ..... Do not compile with use of MIPS DSP rev2 instructions.
@@ -3990,6 +3999,15 @@ if [ "${CFG_AVX}" = "auto" ]; then
     fi
 fi
 
+# detect avx2 support
+if [ "${CFG_AVX2}" = "auto" ]; then
+    if "$unixtests/compile.test" "$XQMAKESPEC" "$QMAKE_CONFIG" $OPT_VERBOSE "$relpath" "$outpath" config.tests/unix/avx2 "avx2" $L_FLAGS $I_FLAGS $l_FLAGS "-march=core-avx2"; then
+       CFG_AVX2=yes
+    else
+       CFG_AVX2=no
+    fi
+fi
+
 # check iWMMXt support
 if [ "$CFG_IWMMXT" = "yes" ]; then
     "$unixtests/compile.test" "$XQMAKESPEC" "$QMAKE_CONFIG" $OPT_VERBOSE "$relpath" "$outpath" config.tests/unix/iwmmxt "iwmmxt" $L_FLAGS $I_FLAGS $l_FLAGS "-mcpu=iwmmxt"
@@ -5555,6 +5573,7 @@ fi
 [ "$CFG_SSE4_1" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG sse4_1"
 [ "$CFG_SSE4_2" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG sse4_2"
 [ "$CFG_AVX" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG avx"
+[ "$CFG_AVX2" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG avx2"
 [ "$CFG_IWMMXT" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG iwmmxt"
 [ "$CFG_NEON" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG neon"
 if [ "$CFG_ARCH" = "mips" ]; then
@@ -6510,7 +6529,7 @@ echo "PCH support ............ $CFG_PRECOMPILE"
 if [ "$CFG_ARCH" = "i386" -o "$CFG_ARCH" = "x86_64" ]; then
     echo "SSE2/SSE3/SSSE3......... ${CFG_SSE2}/${CFG_SSE3}/${CFG_SSSE3}"
     echo "SSE4.1/SSE4.2........... ${CFG_SSSE3}/${CFG_SSE4_1}/${CFG_SSE4_2}"
-    echo "AVX..................... ${CFG_AVX}"
+    echo "AVX/AVX2................ ${CFG_AVX}/${CFG_AVX2}"
 elif [ "$CFG_ARCH" = "arm" ]; then
     echo "iWMMXt support ......... ${CFG_IWMMXT}"
     echo "NEON support ........... ${CFG_NEON}"
-- 
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