ARMv6 optimised pix_abs16_x2

Originally committed as revision 21698 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/arm/dsputil_armv6.S

@@ -315,3 +315,58 @@ function ff_pix_abs16_armv6, export=1
         add             r0,  r12, lr
         pop             {r4-r9, pc}
 .endfunc
+
+function ff_pix_abs16_x2_armv6, export=1
+        ldr             r12, [sp]
+        push            {r4-r11, lr}
+        mov             r0,  #0
+        mov             lr,  #1
+        orr             lr,  lr,  lr,  lsl #8
+        orr             lr,  lr,  lr,  lsl #16
+1:
+        ldr             r8,  [r2]
+        ldr             r9,  [r2, #4]
+        lsr             r10, r8,  #8
+        ldr             r4,  [r1]
+        lsr             r6,  r9,  #8
+        orr             r10, r10, r9,  lsl #24
+        ldr             r5,  [r2, #8]
+        eor             r11, r8,  r10
+        uhadd8          r7,  r8,  r10
+        orr             r6,  r6,  r5,  lsl #24
+        and             r11, r11, lr
+        uadd8           r7,  r7,  r11
+        ldr             r8,  [r1, #4]
+        usada8          r0,  r4,  r7,  r0
+        eor             r7,  r9,  r6
+        lsr             r10, r5,  #8
+        and             r7,  r7,  lr
+        uhadd8          r4,  r9,  r6
+        ldr             r6,  [r2, #12]
+        uadd8           r4,  r4,  r7
+        pld             [r1, r3]
+        orr             r10, r10, r6,  lsl #24
+        usada8          r0,  r8,  r4,  r0
+        ldr             r4,  [r1, #8]
+        eor             r11, r5,  r10
+        ldrb            r7,  [r2, #16]
+        and             r11, r11, lr
+        uhadd8          r8,  r5,  r10
+        ldr             r5,  [r1, #12]
+        uadd8           r8,  r8,  r11
+        pld             [r2, r3]
+        lsr             r10, r6,  #8
+        usada8          r0,  r4,  r8,  r0
+        orr             r10, r10, r7,  lsl #24
+        subs            r12,  r12,  #1
+        eor             r11, r6,  r10
+        add             r1,  r1,  r3
+        uhadd8          r9,  r6,  r10
+        and             r11, r11, lr
+        uadd8           r9,  r9,  r11
+        add             r2,  r2,  r3
+        usada8          r0,  r5,  r9,  r0
+        bgt             1b
+
+        pop             {r4-r11, pc}
+.endfunc

libavcodec/arm/dsputil_init_armv6.c

@@ -52,6 +52,8 @@ void ff_add_pixels_clamped_armv6(const DCTELEM *block,
 
 int ff_pix_abs16_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
                        int line_size, int h);
+int ff_pix_abs16_x2_armv6(void *s, uint8_t *blk1, uint8_t *blk2,
+                          int line_size, int h);
 
 void av_cold ff_dsputil_init_armv6(DSPContext* c, AVCodecContext *avctx)
 {
@@ -87,6 +89,7 @@ void av_cold ff_dsputil_init_armv6(DSPContext* c, AVCodecContext *avctx)
     c->add_pixels_clamped = ff_add_pixels_clamped_armv6;
 
     c->pix_abs[0][0] = ff_pix_abs16_armv6;
+    c->pix_abs[0][1] = ff_pix_abs16_x2_armv6;
 
     c->sad[0] = ff_pix_abs16_armv6;
 }