libvpx: Add VP9 decoder.

source/libvpx/vp9/common/x86/vp9_iwalsh_mmx.asm

+;
+;  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+;
+;  Use of this source code is governed by a BSD-style license
+;  that can be found in the LICENSE file in the root of the source
+;  tree. An additional intellectual property rights grant can be found
+;  in the file PATENTS.  All contributing project authors may
+;  be found in the AUTHORS file in the root of the source tree.
+;
+
+
+%include "vpx_ports/x86_abi_support.asm"
+
+;void vp9_short_inv_walsh4x4_1_mmx(short *input, short *output)
+global sym(vp9_short_inv_walsh4x4_1_mmx)
+sym(vp9_short_inv_walsh4x4_1_mmx):
+    push        rbp
+    mov         rbp, rsp
+    SHADOW_ARGS_TO_STACK 2
+    push        rsi
+    push        rdi
+    ; end prolog
+
+    mov     rsi, arg(0)
+    mov     rax, 3
+
+    mov     rdi, arg(1)
+    add     rax, [rsi]          ;input[0] + 3
+
+    movd    mm0, eax
+
+    punpcklwd mm0, mm0          ;x x val val
+
+    punpckldq mm0, mm0          ;val val val val
+
+    psraw   mm0, 3            ;(input[0] + 3) >> 3
+
+    movq  [rdi + 0], mm0
+    movq  [rdi + 8], mm0
+    movq  [rdi + 16], mm0
+    movq  [rdi + 24], mm0
+
+    ; begin epilog
+    pop rdi
+    pop rsi
+    UNSHADOW_ARGS
+    pop         rbp
+    ret
+
+;void vp9_short_inv_walsh4x4_mmx(short *input, short *output)
+global sym(vp9_short_inv_walsh4x4_mmx)
+sym(vp9_short_inv_walsh4x4_mmx):
+    push        rbp
+    mov         rbp, rsp
+    SHADOW_ARGS_TO_STACK 2
+    push        rsi
+    push        rdi
+    ; end prolog
+
+    mov     rax, 3
+    mov     rsi, arg(0)
+    mov     rdi, arg(1)
+    shl     rax, 16
+
+    movq    mm0, [rsi + 0]        ;ip[0]
+    movq    mm1, [rsi + 8]        ;ip[4]
+    or      rax, 3            ;00030003h
+
+    movq    mm2, [rsi + 16]       ;ip[8]
+    movq    mm3, [rsi + 24]       ;ip[12]
+
+    movq    mm7, rax
+    movq    mm4, mm0
+
+    punpcklwd mm7, mm7          ;0003000300030003h
+    movq    mm5, mm1
+
+    paddw   mm4, mm3          ;ip[0] + ip[12] aka al
+    paddw   mm5, mm2          ;ip[4] + ip[8] aka bl
+
+    movq    mm6, mm4          ;temp al
+
+    paddw   mm4, mm5          ;al + bl
+    psubw   mm6, mm5          ;al - bl
+
+    psubw   mm0, mm3          ;ip[0] - ip[12] aka d1
+    psubw   mm1, mm2          ;ip[4] - ip[8] aka c1
+
+    movq    mm5, mm0          ;temp dl
+
+    paddw   mm0, mm1          ;dl + cl
+    psubw   mm5, mm1          ;dl - cl
+
+    ; 03 02 01 00
+    ; 13 12 11 10
+    ; 23 22 21 20
+    ; 33 32 31 30
+
+    movq    mm3, mm4          ; 03 02 01 00
+    punpcklwd mm4, mm0          ; 11 01 10 00
+    punpckhwd mm3, mm0          ; 13 03 12 02
+
+    movq    mm1, mm6          ; 23 22 21 20
+    punpcklwd mm6, mm5          ; 31 21 30 20
+    punpckhwd mm1, mm5          ; 33 23 32 22
+
+    movq    mm0, mm4          ; 11 01 10 00
+    movq    mm2, mm3          ; 13 03 12 02
+
+    punpckldq mm0, mm6          ; 30 20 10 00 aka ip[0]
+    punpckhdq mm4, mm6          ; 31 21 11 01 aka ip[4]
+
+    punpckldq mm2, mm1          ; 32 22 12 02 aka ip[8]
+    punpckhdq mm3, mm1          ; 33 23 13 03 aka ip[12]
+;~~~~~~~~~~~~~~~~~~~~~
+    movq    mm1, mm0
+    movq    mm5, mm4
+
+    paddw   mm1, mm3          ;ip[0] + ip[12] aka al
+    paddw   mm5, mm2          ;ip[4] + ip[8] aka bl
+
+    movq    mm6, mm1          ;temp al
+
+    paddw   mm1, mm5          ;al + bl
+    psubw   mm6, mm5          ;al - bl
+
+    psubw   mm0, mm3          ;ip[0] - ip[12] aka d1
+    psubw   mm4, mm2          ;ip[4] - ip[8] aka c1
+
+    movq    mm5, mm0          ;temp dl
+
+    paddw   mm0, mm4          ;dl + cl
+    psubw   mm5, mm4          ;dl - cl
+;~~~~~~~~~~~~~~~~~~~~~
+    movq    mm3, mm1          ; 03 02 01 00
+    punpcklwd mm1, mm0          ; 11 01 10 00
+    punpckhwd mm3, mm0          ; 13 03 12 02
+
+    movq    mm4, mm6          ; 23 22 21 20
+    punpcklwd mm6, mm5          ; 31 21 30 20
+    punpckhwd mm4, mm5          ; 33 23 32 22
+
+    movq    mm0, mm1          ; 11 01 10 00
+    movq    mm2, mm3          ; 13 03 12 02
+
+    punpckldq mm0, mm6          ; 30 20 10 00 aka ip[0]
+    punpckhdq mm1, mm6          ; 31 21 11 01 aka ip[4]
+
+    punpckldq mm2, mm4          ; 32 22 12 02 aka ip[8]
+    punpckhdq mm3, mm4          ; 33 23 13 03 aka ip[12]
+
+    paddw   mm0, mm7
+    paddw   mm1, mm7
+    paddw   mm2, mm7
+    paddw   mm3, mm7
+
+    psraw   mm0, 3
+    psraw   mm1, 3
+    psraw   mm2, 3
+    psraw   mm3, 3
+
+    movq  [rdi + 0], mm0
+    movq  [rdi + 8], mm1
+    movq  [rdi + 16], mm2
+    movq  [rdi + 24], mm3
+
+    ; begin epilog
+    pop rdi
+    pop rsi
+    UNSHADOW_ARGS
+    pop         rbp
+    ret
+