From d3a4b4e09c049e20edc862a933d707e36b6232c1 Mon Sep 17 00:00:00 2001
From: Diego Biurrun <diego@biurrun.de>
Date: Wed, 11 Feb 2009 11:16:00 +0000
Subject: [PATCH] Add check whether the compiler/assembler supports 10 or more
operands. thanks to Loren for some help with the asm statements
Originally committed as revision 17151 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
configure | 14 ++++++++++++++
libavcodec/x86/dsputil_mmx.c | 4 ++--
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index dc51fa592dd..210c575df09 100755
--- a/configure
+++ b/configure
@@ -898,6 +898,7 @@ HAVE_LIST="
sys_select_h
sys_soundcard_h
sys_videoio_h
+ ten_operands
termios_h
threads
truncf
@@ -1778,6 +1779,18 @@ EOF
# check wether EBX is available on x86
check_asm ebx_available '"":::"%ebx"'
+ # check whether more than 10 operands are supported
+ check_cc <<EOF && enable ten_operands
+int main(void) {
+ int x=0;
+ __asm__ volatile(
+ ""
+ :"+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x)
+ );
+ return 0;
+}
+EOF
+
# check whether binutils is new enough to compile SSSE3/MMX2
enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
enabled mmx2 && check_asm mmx2 '"movss %xmm0, %xmm0"'
@@ -2190,6 +2203,7 @@ if enabled x86; then
echo "CMOV is fast ${fast_cmov-no}"
echo "EBX available ${ebx_available-no}"
echo "EBP available ${ebp_available-no}"
+ echo "10 operands supported ${ten_operands-no}"
fi
if enabled arm; then
echo "ARMv5TE enabled ${armv5te-no}"
diff --git a/libavcodec/x86/dsputil_mmx.c b/libavcodec/x86/dsputil_mmx.c
index 0cab053c4eb..bb8b6925d2b 100644
--- a/libavcodec/x86/dsputil_mmx.c
+++ b/libavcodec/x86/dsputil_mmx.c
@@ -548,7 +548,7 @@ static void add_bytes_l2_mmx(uint8_t *dst, uint8_t *src1, uint8_t *src2, int w){
dst[i] = src1[i] + src2[i];
}
-#if HAVE_7REGS
+#if HAVE_7REGS && HAVE_TEN_OPERANDS
static void add_hfyu_median_prediction_cmov(uint8_t *dst, uint8_t *top, uint8_t *diff, int w, int *left, int *left_top) {
x86_reg w2 = -w;
x86_reg x;
@@ -2799,7 +2799,7 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
#if HAVE_YASM
c->add_hfyu_median_prediction = ff_add_hfyu_median_prediction_mmx2;
#endif
-#if HAVE_7REGS
+#if HAVE_7REGS && HAVE_TEN_OPERANDS
if( mm_flags&FF_MM_3DNOW )
c->add_hfyu_median_prediction = add_hfyu_median_prediction_cmov;
#endif
--
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