NEON configure detection and initial blend function implementations.

Adds new NEON configure test and -no-neon configure option. NEON
implementations can also be turned off by setting the QT_NO_NEON
environment variable.

Performance improvements (in frames per second):
- Blending ARGB32 on RGB32/ARGB32, mostly opaque: 71 %
- Blending ARGB32 on RGB32/ARGB32, no opaque pixels: 108 %
- Blending ARGB32 on RGB32/ARGB32, with 0.5 opacity: 158 %
- Blending RGB32 on RGB32/ARGB32, with 0.5 opacity: 189 %

Task-number: QTBUG-6684
Reviewed-by: Gunnar Sletta
Reviewed-by: Paul Olav Tvete

1 files changed, 21 insertions, 1 deletions

diff --git a/configure b/configure
index 2114863..22e6bd4 100755
--- a/configure
+++ b/configure
@@ -745,6 +745,7 @@ CFG_HOST_ENDIAN=auto
 CFG_DOUBLEFORMAT=auto
 CFG_ARMFPA=auto
 CFG_IWMMXT=no
+CFG_NEON=auto
 CFG_CLOCK_GETTIME=auto
 CFG_CLOCK_MONOTONIC=auto
 CFG_MREMAP=auto
@@ -1604,6 +1605,13 @@ while [ "$#" -gt 0 ]; do
     iwmmxt)
 	CFG_IWMMXT="yes"
 	;;
+    neon)
+        if [ "$VAL" = "no" ]; then
+            CFG_NEON="$VAL"
+        else
+            UNKNOWN_OPT=yes
+        fi
+        ;;
     reduce-relocations)
         if [ "$VAL" = "yes" ] || [ "$VAL" = "no" ]; then
             CFG_REDUCE_RELOCATIONS="$VAL"
@@ -3889,6 +3897,7 @@ Qt for Embedded Linux only:
     -iwmmxt ............ Compile using the iWMMXt instruction set
                          (available on some XScale CPUs).
 
+    -no-neon ........... Do not compile with use of NEON instructions.
 EOF
 fi
 
@@ -4509,6 +4518,15 @@ if [ "$CFG_IWMMXT" = "yes" ]; then
     fi
 fi
 
+# detect neon support
+if ([ "$CFG_ARCH" = "arm" ] || [ "$CFG_ARCH" = "armv6" ]) && [ "${CFG_NEON}" = "auto" ]; then
+    if "$unixtests/compile.test" "$XQMAKESPEC" "$QMAKE_CONFIG" $OPT_VERBOSE "$relpath" "$outpath" config.tests/unix/neon "neon" $L_FLAGS $I_FLAGS $l_FLAGS "-mfpu=neon"; then
+	CFG_NEON=yes
+    else
+	CFG_NEON=no
+    fi
+fi
+
 # detect zlib
 if [ "$CFG_ZLIB" = "no" ]; then
     # Note: Qt no longer support builds without zlib
@@ -6124,6 +6142,7 @@ fi
 [ "$CFG_SSE" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG sse"
 [ "$CFG_SSE2" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG sse2"
 [ "$CFG_IWMMXT" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG iwmmxt"
+[ "$CFG_NEON" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG neon"
 [ "$PLATFORM_MAC" = "yes" ] && QMAKE_CONFIG="$QMAKE_CONFIG $CFG_MAC_ARCHS"
 if [ "$CFG_IPV6" = "yes" ]; then
     QT_CONFIG="$QT_CONFIG ipv6"
@@ -7416,8 +7435,9 @@ echo "Declarative module .. $CFG_DECLARATIVE"
 echo "STL support ......... $CFG_STL"
 echo "PCH support ......... $CFG_PRECOMPILE"
 echo "MMX/3DNOW/SSE/SSE2..  ${CFG_MMX}/${CFG_3DNOW}/${CFG_SSE}/${CFG_SSE2}"
-if [ "${CFG_ARCH}" = "arm" ]; then
+if [ "$CFG_ARCH" = "arm" ] || [ "$CFG_ARCH" = "armv6" ]; then
     echo "iWMMXt support ...... ${CFG_IWMMXT}"
+    echo "NEON support ........ ${CFG_NEON}"
 fi
 [ "${PLATFORM_QWS}" != "yes" ] && echo "Graphics System ..... $CFG_GRAPHICS_SYSTEM"
 echo "IPv6 support ........ $CFG_IPV6"