ref: f2d91e2c24b4bf15d6eca1829bfab8cc013549dc
dir: /vp9/encoder/x86/vp9_dct_sse2.asm/
;
; Copyright (c) 2016 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.
;
%define private_prefix vp9
%include "third_party/x86inc/x86inc.asm"
%include "vpx_dsp/x86/bitdepth_conversion_sse2.asm"
SECTION .text
%macro TRANSFORM_COLS 0
paddw m0, m1
movq m4, m0
psubw m3, m2
psubw m4, m3
psraw m4, 1
movq m5, m4
psubw m5, m1 ;b1
psubw m4, m2 ;c1
psubw m0, m4
paddw m3, m5
; m0 a0
SWAP 1, 4 ; m1 c1
SWAP 2, 3 ; m2 d1
SWAP 3, 5 ; m3 b1
%endmacro
%macro TRANSPOSE_4X4 0
; 00 01 02 03
; 10 11 12 13
; 20 21 22 23
; 30 31 32 33
punpcklwd m0, m1 ; 00 10 01 11 02 12 03 13
punpcklwd m2, m3 ; 20 30 21 31 22 32 23 33
mova m1, m0
punpckldq m0, m2 ; 00 10 20 30 01 11 21 31
punpckhdq m1, m2 ; 02 12 22 32 03 13 23 33
%endmacro
INIT_XMM sse2
cglobal fwht4x4, 3, 4, 8, input, output, stride
lea r3q, [inputq + strideq*4]
movq m0, [inputq] ;a1
movq m1, [inputq + strideq*2] ;b1
movq m2, [r3q] ;c1
movq m3, [r3q + strideq*2] ;d1
TRANSFORM_COLS
TRANSPOSE_4X4
SWAP 1, 2
psrldq m1, m0, 8
psrldq m3, m2, 8
TRANSFORM_COLS
TRANSPOSE_4X4
psllw m0, 2
psllw m1, 2
STORE_TRAN_LOW 0, outputq, 0, 2, 3
STORE_TRAN_LOW 1, outputq, 8, 2, 3
RET