Port pred8x8l_horizontal_mmxext/ssse3 (H.264 intra prediction) from x264 to

FFmpeg. Original authors: Holger Lubitz <holger lubitz org>, Jason Garrett-
Glaser <darkshikari gmail com> (approves LGPL relicensing for this code) and
Loren Merritt <lorenm at u dot washington dot edu> (approves LGPL relicensing
for this code). Patch by Daniel Kang <daniel dot d dot kang at gmail com>, as
part of Google's GCI 2010.

Originally committed as revision 26139 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/x86/h264_intrapred.asm

@@ -1243,6 +1243,85 @@ PRED8x8L_DC mmxext
 PRED8x8L_DC ssse3
 %endif
 
+;-----------------------------------------------------------------------------
+; void pred8x8l_horizontal(uint8_t *src, int has_topleft, int has_topright, int stride)
+;-----------------------------------------------------------------------------
+%ifdef CONFIG_GPL
+%macro PRED8x8L_HORIZONTAL 1
+cglobal pred8x8l_horizontal_%1, 4,4
+    sub          r0, r3
+    lea          r2, [r0+r3*2]
+    movq        mm0, [r0+r3*1-8]
+    punpckhbw   mm0, [r0+r3*0-8]
+    movq        mm1, [r2+r3*1-8]
+    punpckhbw   mm1, [r0+r3*2-8]
+    mov          r2, r0
+    punpckhwd   mm1, mm0
+    lea          r0, [r0+r3*4]
+    movq        mm2, [r0+r3*1-8]
+    punpckhbw   mm2, [r0+r3*0-8]
+    lea          r0, [r0+r3*2]
+    movq        mm3, [r0+r3*1-8]
+    punpckhbw   mm3, [r0+r3*0-8]
+    punpckhwd   mm3, mm2
+    punpckhdq   mm3, mm1
+    lea          r0, [r0+r3*2]
+    movq        mm0, [r0+r3*0-8]
+    movq        mm1, [r2]
+    mov          r0, r2
+    movq        mm4, mm3
+    movq        mm2, mm3
+    PALIGNR     mm4, mm0, 7, mm0
+    PALIGNR     mm1, mm2, 1, mm2
+    test        r1, r1 ; top_left
+    jnz .do_left
+.fix_lt_1:
+    movq        mm5, mm3
+    pxor        mm5, mm4
+    psrlq       mm5, 56
+    psllq       mm5, 48
+    pxor        mm1, mm5
+.do_left:
+    movq        mm0, mm4
+    PRED4x4_LOWPASS mm2, mm1, mm4, mm3, mm5
+    movq        mm4, mm0
+    movq        mm7, mm2
+    PRED4x4_LOWPASS mm1, mm3, mm0, mm4, mm5
+    psllq       mm1, 56
+    PALIGNR     mm7, mm1, 7, mm3
+    movq        mm3, mm7
+    lea         r1, [r0+r3*2]
+    movq       mm7, mm3
+    punpckhbw  mm3, mm3
+    punpcklbw  mm7, mm7
+    pshufw     mm0, mm3, 0xff
+    pshufw     mm1, mm3, 0xaa
+    lea         r2, [r1+r3*2]
+    pshufw     mm2, mm3, 0x55
+    pshufw     mm3, mm3, 0x00
+    pshufw     mm4, mm7, 0xff
+    pshufw     mm5, mm7, 0xaa
+    pshufw     mm6, mm7, 0x55
+    pshufw     mm7, mm7, 0x00
+    movq [r0+r3*1], mm0
+    movq [r0+r3*2], mm1
+    movq [r1+r3*1], mm2
+    movq [r1+r3*2], mm3
+    movq [r2+r3*1], mm4
+    movq [r2+r3*2], mm5
+    lea         r0, [r2+r3*2]
+    movq [r0+r3*1], mm6
+    movq [r0+r3*2], mm7
+    RET
+%endmacro
+
+INIT_MMX
+%define PALIGNR PALIGNR_MMX
+PRED8x8L_HORIZONTAL mmxext
+%define PALIGNR PALIGNR_SSSE3
+PRED8x8L_HORIZONTAL ssse3
+%endif
+
 ;-----------------------------------------------------------------------------
 ; void pred4x4_dc_mmxext(uint8_t *src, const uint8_t *topright, int stride)
 ;-----------------------------------------------------------------------------

libavcodec/x86/h264_intrapred_init.c

@@ -63,6 +63,8 @@ void ff_pred8x8l_top_dc_mmxext     (uint8_t *src, int has_topleft, int has_topri
 void ff_pred8x8l_top_dc_ssse3      (uint8_t *src, int has_topleft, int has_topright, int stride);
 void ff_pred8x8l_dc_mmxext         (uint8_t *src, int has_topleft, int has_topright, int stride);
 void ff_pred8x8l_dc_ssse3          (uint8_t *src, int has_topleft, int has_topright, int stride);
+void ff_pred8x8l_horizontal_mmxext (uint8_t *src, int has_topleft, int has_topright, int stride);
+void ff_pred8x8l_horizontal_ssse3  (uint8_t *src, int has_topleft, int has_topright, int stride);
 void ff_pred4x4_dc_mmxext          (uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_down_left_mmxext   (uint8_t *src, const uint8_t *topright, int stride);
 void ff_pred4x4_tm_vp8_mmx         (uint8_t *src, const uint8_t *topright, int stride);
@@ -103,6 +105,7 @@ void ff_h264_pred_init_x86(H264PredContext *h, int codec_id)
 #if CONFIG_GPL
         h->pred8x8l [TOP_DC_PRED ] = ff_pred8x8l_top_dc_mmxext;
         h->pred8x8l [DC_PRED     ] = ff_pred8x8l_dc_mmxext;
+        h->pred8x8l [HOR_PRED    ] = ff_pred8x8l_horizontal_mmxext;
 #endif
         h->pred4x4  [DC_PRED     ] = ff_pred4x4_dc_mmxext;
 #if CONFIG_GPL
@@ -159,6 +162,7 @@ void ff_h264_pred_init_x86(H264PredContext *h, int codec_id)
 #if CONFIG_GPL
         h->pred8x8l [TOP_DC_PRED ] = ff_pred8x8l_top_dc_ssse3;
         h->pred8x8l [DC_PRED     ] = ff_pred8x8l_dc_ssse3;
+        h->pred8x8l [HOR_PRED    ] = ff_pred8x8l_horizontal_ssse3;
 #endif
         if (codec_id == CODEC_ID_VP8) {
             h->pred8x8  [PLANE_PRED8x8] = ff_pred8x8_tm_vp8_ssse3;