ref: 2d6393a98d5089d52cea3353e3a9e0b52a28c3f5
dir: /vp8/encoder/x86/dct_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 vp8_short_fdct4x4_mmx(short *input, short *output, int pitch)
global sym(vp8_short_fdct4x4_mmx) PRIVATE
sym(vp8_short_fdct4x4_mmx):
push rbp
mov rbp, rsp
SHADOW_ARGS_TO_STACK 3
GET_GOT rbx
push rsi
push rdi
; end prolog
mov rsi, arg(0) ; input
mov rdi, arg(1) ; output
movsxd rax, dword ptr arg(2) ;pitch
lea rcx, [rsi + rax*2]
; read the input data
movq mm0, [rsi]
movq mm1, [rsi + rax]
movq mm2, [rcx]
movq mm4, [rcx + rax]
; transpose for the first stage
movq mm3, mm0 ; 00 01 02 03
movq mm5, mm2 ; 20 21 22 23
punpcklwd mm0, mm1 ; 00 10 01 11
punpckhwd mm3, mm1 ; 02 12 03 13
punpcklwd mm2, mm4 ; 20 30 21 31
punpckhwd mm5, mm4 ; 22 32 23 33
movq mm1, mm0 ; 00 10 01 11
punpckldq mm0, mm2 ; 00 10 20 30
punpckhdq mm1, mm2 ; 01 11 21 31
movq mm2, mm3 ; 02 12 03 13
punpckldq mm2, mm5 ; 02 12 22 32
punpckhdq mm3, mm5 ; 03 13 23 33
; mm0 0
; mm1 1
; mm2 2
; mm3 3
; first stage
movq mm5, mm0
movq mm4, mm1
paddw mm0, mm3 ; a1 = 0 + 3
paddw mm1, mm2 ; b1 = 1 + 2
psubw mm4, mm2 ; c1 = 1 - 2
psubw mm5, mm3 ; d1 = 0 - 3
psllw mm5, 3
psllw mm4, 3
psllw mm0, 3
psllw mm1, 3
; output 0 and 2
movq mm2, mm0 ; a1
paddw mm0, mm1 ; op[0] = a1 + b1
psubw mm2, mm1 ; op[2] = a1 - b1
; output 1 and 3
; interleave c1, d1
movq mm1, mm5 ; d1
punpcklwd mm1, mm4 ; c1 d1
punpckhwd mm5, mm4 ; c1 d1
movq mm3, mm1
movq mm4, mm5
pmaddwd mm1, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
pmaddwd mm4, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
pmaddwd mm3, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
pmaddwd mm5, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
paddd mm1, MMWORD PTR[GLOBAL(_14500)]
paddd mm4, MMWORD PTR[GLOBAL(_14500)]
paddd mm3, MMWORD PTR[GLOBAL(_7500)]
paddd mm5, MMWORD PTR[GLOBAL(_7500)]
psrad mm1, 12 ; (c1 * 2217 + d1 * 5352 + 14500)>>12
psrad mm4, 12 ; (c1 * 2217 + d1 * 5352 + 14500)>>12
psrad mm3, 12 ; (d1 * 2217 - c1 * 5352 + 7500)>>12
psrad mm5, 12 ; (d1 * 2217 - c1 * 5352 + 7500)>>12
packssdw mm1, mm4 ; op[1]
packssdw mm3, mm5 ; op[3]
; done with vertical
; transpose for the second stage
movq mm4, mm0 ; 00 10 20 30
movq mm5, mm2 ; 02 12 22 32
punpcklwd mm0, mm1 ; 00 01 10 11
punpckhwd mm4, mm1 ; 20 21 30 31
punpcklwd mm2, mm3 ; 02 03 12 13
punpckhwd mm5, mm3 ; 22 23 32 33
movq mm1, mm0 ; 00 01 10 11
punpckldq mm0, mm2 ; 00 01 02 03
punpckhdq mm1, mm2 ; 01 22 12 13
movq mm2, mm4 ; 20 31 30 31
punpckldq mm2, mm5 ; 20 21 22 23
punpckhdq mm4, mm5 ; 30 31 32 33
; mm0 0
; mm1 1
; mm2 2
; mm3 4
movq mm5, mm0
movq mm3, mm1
paddw mm0, mm4 ; a1 = 0 + 3
paddw mm1, mm2 ; b1 = 1 + 2
psubw mm3, mm2 ; c1 = 1 - 2
psubw mm5, mm4 ; d1 = 0 - 3
pxor mm6, mm6 ; zero out for compare
pcmpeqw mm6, mm5 ; d1 != 0
pandn mm6, MMWORD PTR[GLOBAL(_cmp_mask)] ; clear upper,
; and keep bit 0 of lower
; output 0 and 2
movq mm2, mm0 ; a1
paddw mm0, mm1 ; a1 + b1
psubw mm2, mm1 ; a1 - b1
paddw mm0, MMWORD PTR[GLOBAL(_7w)]
paddw mm2, MMWORD PTR[GLOBAL(_7w)]
psraw mm0, 4 ; op[0] = (a1 + b1 + 7)>>4
psraw mm2, 4 ; op[8] = (a1 - b1 + 7)>>4
movq MMWORD PTR[rdi + 0 ], mm0
movq MMWORD PTR[rdi + 16], mm2
; output 1 and 3
; interleave c1, d1
movq mm1, mm5 ; d1
punpcklwd mm1, mm3 ; c1 d1
punpckhwd mm5, mm3 ; c1 d1
movq mm3, mm1
movq mm4, mm5
pmaddwd mm1, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
pmaddwd mm4, MMWORD PTR[GLOBAL (_5352_2217)] ; c1*2217 + d1*5352
pmaddwd mm3, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
pmaddwd mm5, MMWORD PTR[GLOBAL(_2217_neg5352)] ; d1*2217 - c1*5352
paddd mm1, MMWORD PTR[GLOBAL(_12000)]
paddd mm4, MMWORD PTR[GLOBAL(_12000)]
paddd mm3, MMWORD PTR[GLOBAL(_51000)]
paddd mm5, MMWORD PTR[GLOBAL(_51000)]
psrad mm1, 16 ; (c1 * 2217 + d1 * 5352 + 14500)>>16
psrad mm4, 16 ; (c1 * 2217 + d1 * 5352 + 14500)>>16
psrad mm3, 16 ; (d1 * 2217 - c1 * 5352 + 7500)>>16
psrad mm5, 16 ; (d1 * 2217 - c1 * 5352 + 7500)>>16
packssdw mm1, mm4 ; op[4]
packssdw mm3, mm5 ; op[12]
paddw mm1, mm6 ; op[4] += (d1!=0)
movq MMWORD PTR[rdi + 8 ], mm1
movq MMWORD PTR[rdi + 24], mm3
; begin epilog
pop rdi
pop rsi
RESTORE_GOT
UNSHADOW_ARGS
pop rbp
ret
SECTION_RODATA
align 8
_5352_2217:
dw 5352
dw 2217
dw 5352
dw 2217
align 8
_2217_neg5352:
dw 2217
dw -5352
dw 2217
dw -5352
align 8
_cmp_mask:
times 4 dw 1
align 8
_7w:
times 4 dw 7
align 8
_14500:
times 2 dd 14500
align 8
_7500:
times 2 dd 7500
align 8
_12000:
times 2 dd 12000
align 8
_51000:
times 2 dd 51000