ref: 2a1d89e2782087c240635362b4875cc702e16cf5
dir: /vpx_dsp/x86/subtract_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 "third_party/x86inc/x86inc.asm"
SECTION .text
; void vpx_subtract_block(int rows, int cols,
; int16_t *diff, ptrdiff_t diff_stride,
; const uint8_t *src, ptrdiff_t src_stride,
; const uint8_t *pred, ptrdiff_t pred_stride)
INIT_XMM sse2
cglobal subtract_block, 7, 7, 8, \
rows, cols, diff, diff_stride, src, src_stride, \
pred, pred_stride
%define pred_str colsq
pxor m7, m7 ; dedicated zero register
cmp colsd, 4
je .case_4
cmp colsd, 8
je .case_8
cmp colsd, 16
je .case_16
cmp colsd, 32
je .case_32
%macro loop16 6
mova m0, [srcq+%1]
mova m4, [srcq+%2]
mova m1, [predq+%3]
mova m5, [predq+%4]
punpckhbw m2, m0, m7
punpckhbw m3, m1, m7
punpcklbw m0, m7
punpcklbw m1, m7
psubw m2, m3
psubw m0, m1
punpckhbw m1, m4, m7
punpckhbw m3, m5, m7
punpcklbw m4, m7
punpcklbw m5, m7
psubw m1, m3
psubw m4, m5
mova [diffq+mmsize*0+%5], m0
mova [diffq+mmsize*1+%5], m2
mova [diffq+mmsize*0+%6], m4
mova [diffq+mmsize*1+%6], m1
%endmacro
mov pred_str, pred_stridemp
.loop_64:
loop16 0*mmsize, 1*mmsize, 0*mmsize, 1*mmsize, 0*mmsize, 2*mmsize
loop16 2*mmsize, 3*mmsize, 2*mmsize, 3*mmsize, 4*mmsize, 6*mmsize
lea diffq, [diffq+diff_strideq*2]
add predq, pred_str
add srcq, src_strideq
dec rowsd
jg .loop_64
RET
.case_32:
mov pred_str, pred_stridemp
.loop_32:
loop16 0, mmsize, 0, mmsize, 0, 2*mmsize
lea diffq, [diffq+diff_strideq*2]
add predq, pred_str
add srcq, src_strideq
dec rowsd
jg .loop_32
RET
.case_16:
mov pred_str, pred_stridemp
.loop_16:
loop16 0, src_strideq, 0, pred_str, 0, diff_strideq*2
lea diffq, [diffq+diff_strideq*4]
lea predq, [predq+pred_str*2]
lea srcq, [srcq+src_strideq*2]
sub rowsd, 2
jg .loop_16
RET
%macro loop_h 0
movh m0, [srcq]
movh m2, [srcq+src_strideq]
movh m1, [predq]
movh m3, [predq+pred_str]
punpcklbw m0, m7
punpcklbw m1, m7
punpcklbw m2, m7
punpcklbw m3, m7
psubw m0, m1
psubw m2, m3
mova [diffq], m0
mova [diffq+diff_strideq*2], m2
%endmacro
.case_8:
mov pred_str, pred_stridemp
.loop_8:
loop_h
lea diffq, [diffq+diff_strideq*4]
lea srcq, [srcq+src_strideq*2]
lea predq, [predq+pred_str*2]
sub rowsd, 2
jg .loop_8
RET
INIT_MMX
.case_4:
mov pred_str, pred_stridemp
.loop_4:
loop_h
lea diffq, [diffq+diff_strideq*4]
lea srcq, [srcq+src_strideq*2]
lea predq, [predq+pred_str*2]
sub rowsd, 2
jg .loop_4
RET