configure: Drop check for availability of ten assembler operands.

This was done to support gcc 2.95, which is an old legacy compiler
that fails to compile the current codebase anyway.

configure

@@ -1120,7 +1120,6 @@ HAVE_LIST="
     sys_select_h
     sys_soundcard_h
     sys_videoio_h
-    ten_operands
     threads
     trunc
     truncf
@@ -2704,18 +2703,6 @@ EOF
     # check whether xmm clobbers are supported
     check_asm xmm_clobbers '"":::"%xmm0"'
 
-    # 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  '"pmaxub %mm0, %mm1"'
@@ -3126,7 +3113,6 @@ 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}"

libavcodec/x86/dsputil_mmx.c

@@ -602,7 +602,7 @@ 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 && HAVE_TEN_OPERANDS
+#if HAVE_7REGS
 static void add_hfyu_median_prediction_cmov(uint8_t *dst, const uint8_t *top, const uint8_t *diff, int w, int *left, int *left_top) {
     x86_reg w2 = -w;
     x86_reg x;
@@ -2674,7 +2674,7 @@ void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx)
 
             c->add_hfyu_median_prediction = ff_add_hfyu_median_prediction_mmx2;
 #endif
-#if HAVE_7REGS && HAVE_TEN_OPERANDS
+#if HAVE_7REGS
             if( mm_flags&AV_CPU_FLAG_3DNOW )
                 c->add_hfyu_median_prediction = add_hfyu_median_prediction_cmov;
 #endif

libavcodec/x86/mlpdsp.c

@@ -23,7 +23,7 @@
 #include "libavcodec/dsputil.h"
 #include "libavcodec/mlp.h"
 
-#if HAVE_7REGS && HAVE_TEN_OPERANDS
+#if HAVE_7REGS
 
 extern void ff_mlp_firorder_8;
 extern void ff_mlp_firorder_7;
@@ -171,11 +171,11 @@ static void mlp_filter_channel_x86(int32_t *state, const int32_t *coeff,
     );
 }
 
-#endif /* HAVE_7REGS && HAVE_TEN_OPERANDS */
+#endif /* HAVE_7REGS */
 
 void ff_mlp_init_x86(DSPContext* c, AVCodecContext *avctx)
 {
-#if HAVE_7REGS && HAVE_TEN_OPERANDS
+#if HAVE_7REGS
     c->mlp_filter_channel = mlp_filter_channel_x86;
 #endif
 }