libvpx: Add VP9 decoder.

source/libvpx/vp9/common/x86/vp9_iwalsh_sse2.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_sse2(short *input, short *output)
+global sym(vp9_short_inv_walsh4x4_sse2)
+sym(vp9_short_inv_walsh4x4_sse2):
+    push        rbp
+    mov         rbp, rsp
+    SHADOW_ARGS_TO_STACK 2
+    SAVE_XMM 6
+    push        rsi
+    push        rdi
+    ; end prolog
+
+    mov     rsi, arg(0)
+    mov     rdi, arg(1)
+    mov     rax, 3
+
+    movdqa    xmm0, [rsi + 0]       ;ip[4] ip[0]
+    movdqa    xmm1, [rsi + 16]      ;ip[12] ip[8]
+
+    shl     rax, 16
+    or      rax, 3            ;00030003h
+
+    pshufd    xmm2, xmm1, 4eh       ;ip[8] ip[12]
+    movdqa    xmm3, xmm0          ;ip[4] ip[0]
+
+    paddw   xmm0, xmm2          ;ip[4]+ip[8] ip[0]+ip[12] aka b1 a1
+    psubw   xmm3, xmm2          ;ip[4]-ip[8] ip[0]-ip[12] aka c1 d1
+
+    movdqa    xmm4, xmm0
+    punpcklqdq  xmm0, xmm3          ;d1 a1
+    punpckhqdq  xmm4, xmm3          ;c1 b1
+    movd    xmm6, eax
+
+    movdqa    xmm1, xmm4          ;c1 b1
+    paddw   xmm4, xmm0          ;dl+cl a1+b1 aka op[4] op[0]
+    psubw   xmm0, xmm1          ;d1-c1 a1-b1 aka op[12] op[8]
+
+;;;temp output
+;;  movdqu  [rdi + 0], xmm4
+;;  movdqu  [rdi + 16], xmm3
+
+;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    ; 13 12 11 10 03 02 01 00
+    ;
+    ; 33 32 31 30 23 22 21 20
+    ;
+    movdqa    xmm3, xmm4          ; 13 12 11 10 03 02 01 00
+    punpcklwd xmm4, xmm0          ; 23 03 22 02 21 01 20 00
+    punpckhwd xmm3, xmm0          ; 33 13 32 12 31 11 30 10
+    movdqa    xmm1, xmm4          ; 23 03 22 02 21 01 20 00
+    punpcklwd xmm4, xmm3          ; 31 21 11 01 30 20 10 00
+    punpckhwd xmm1, xmm3          ; 33 23 13 03 32 22 12 02
+    ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    pshufd    xmm2, xmm1, 4eh       ;ip[8] ip[12]
+    movdqa    xmm3, xmm4          ;ip[4] ip[0]
+
+    pshufd    xmm6, xmm6, 0       ;03 03 03 03 03 03 03 03
+
+    paddw   xmm4, xmm2          ;ip[4]+ip[8] ip[0]+ip[12] aka b1 a1
+    psubw   xmm3, xmm2          ;ip[4]-ip[8] ip[0]-ip[12] aka c1 d1
+
+    movdqa    xmm5, xmm4
+    punpcklqdq  xmm4, xmm3          ;d1 a1
+    punpckhqdq  xmm5, xmm3          ;c1 b1
+
+    movdqa    xmm1, xmm5          ;c1 b1
+    paddw   xmm5, xmm4          ;dl+cl a1+b1 aka op[4] op[0]
+    psubw   xmm4, xmm1          ;d1-c1 a1-b1 aka op[12] op[8]
+;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    ; 13 12 11 10 03 02 01 00
+    ;
+    ; 33 32 31 30 23 22 21 20
+    ;
+    movdqa    xmm0, xmm5          ; 13 12 11 10 03 02 01 00
+    punpcklwd xmm5, xmm4          ; 23 03 22 02 21 01 20 00
+    punpckhwd xmm0, xmm4          ; 33 13 32 12 31 11 30 10
+    movdqa    xmm1, xmm5          ; 23 03 22 02 21 01 20 00
+    punpcklwd xmm5, xmm0          ; 31 21 11 01 30 20 10 00
+    punpckhwd xmm1, xmm0          ; 33 23 13 03 32 22 12 02
+;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    paddw   xmm5, xmm6
+    paddw   xmm1, xmm6
+
+    psraw   xmm5, 3
+    psraw   xmm1, 3
+
+    movdqa  [rdi + 0], xmm5
+    movdqa  [rdi + 16], xmm1
+
+    ; begin epilog
+    pop rdi
+    pop rsi
+    RESTORE_XMM
+    UNSHADOW_ARGS
+    pop         rbp
+    ret
+
+SECTION_RODATA
+align 16
+x_s1sqr2:
+    times 4 dw 0x8A8C
+align 16
+x_c1sqr2less1:
+    times 4 dw 0x4E7B
+align 16
+fours:
+    times 4 dw 0x0004