ref: 472e14e725acec83e1ed4f945b64e2f14dcaacaa
dir: /vpx_dsp/x86/inv_txfm_sse2.asm/
;
; Copyright (c) 2015 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
%macro REORDER_INPUTS 0
; a c d b to a b c d
SWAP 1, 3, 2
%endmacro
%macro TRANSFORM_COLS 0
; input:
; m0 a
; m1 b
; m2 c
; m3 d
paddw m0, m2
psubw m3, m1
; wide subtract
punpcklwd m4, m0
punpcklwd m5, m3
psrad m4, 16
psrad m5, 16
psubd m4, m5
psrad m4, 1
packssdw m4, m4 ; e
psubw m5, m4, m1 ; b
psubw m4, m2 ; c
psubw m0, m5
paddw m3, m4
; m0 a
SWAP 1, 5 ; m1 b
SWAP 2, 4 ; m2 c
; m3 d
%endmacro
%macro TRANSPOSE_4X4 0
punpcklwd m0, m2
punpcklwd m1, m3
mova m2, m0
punpcklwd m0, m1
punpckhwd m2, m1
pshufd m1, m0, 0x0e
pshufd m3, m2, 0x0e
%endmacro
; transpose a 4x4 int16 matrix in xmm0 and xmm1 to the bottom half of xmm0-xmm3
%macro TRANSPOSE_4X4_WIDE 0
mova m3, m0
punpcklwd m0, m1
punpckhwd m3, m1
mova m2, m0
punpcklwd m0, m3
punpckhwd m2, m3
pshufd m1, m0, 0x0e
pshufd m3, m2, 0x0e
%endmacro
%macro ADD_STORE_4P_2X 5 ; src1, src2, tmp1, tmp2, zero
movd m%3, [outputq]
movd m%4, [outputq + strideq]
punpcklbw m%3, m%5
punpcklbw m%4, m%5
paddw m%1, m%3
paddw m%2, m%4
packuswb m%1, m%5
packuswb m%2, m%5
movd [outputq], m%1
movd [outputq + strideq], m%2
%endmacro
INIT_XMM sse2
cglobal iwht4x4_16_add, 3, 3, 7, input, output, stride
mova m0, [inputq + 0]
mova m1, [inputq + 16]
psraw m0, 2
psraw m1, 2
TRANSPOSE_4X4_WIDE
REORDER_INPUTS
TRANSFORM_COLS
TRANSPOSE_4X4
REORDER_INPUTS
TRANSFORM_COLS
pxor m4, m4
ADD_STORE_4P_2X 0, 1, 5, 6, 4
lea outputq, [outputq + 2 * strideq]
ADD_STORE_4P_2X 2, 3, 5, 6, 4
RET