71 lines
2.0 KiB
NASM
71 lines
2.0 KiB
NASM
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; Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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%include "third_party/x86inc/x86inc.asm"
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SECTION .text
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%macro TRANSFORM_COLS 0
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paddw m0, m1
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movq m4, m0
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psubw m3, m2
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psubw m4, m3
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psraw m4, 1
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movq m5, m4
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psubw m5, m1 ;b1
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psubw m4, m2 ;c1
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psubw m0, m4
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paddw m3, m5
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; m0 a0
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SWAP 1, 4 ; m1 c1
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SWAP 2, 3 ; m2 d1
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SWAP 3, 5 ; m3 b1
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%endmacro
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%macro TRANSPOSE_4X4 0
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movq m4, m0
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movq m5, m2
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punpcklwd m4, m1
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punpckhwd m0, m1
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punpcklwd m5, m3
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punpckhwd m2, m3
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movq m1, m4
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movq m3, m0
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punpckldq m1, m5
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punpckhdq m4, m5
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punpckldq m3, m2
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punpckhdq m0, m2
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SWAP 2, 3, 0, 1, 4
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%endmacro
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INIT_MMX mmx
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cglobal fwht4x4, 3, 4, 8, input, output, stride
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lea r3q, [inputq + strideq*4]
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movq m0, [inputq] ;a1
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movq m1, [inputq + strideq*2] ;b1
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movq m2, [r3q] ;c1
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movq m3, [r3q + strideq*2] ;d1
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TRANSFORM_COLS
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TRANSPOSE_4X4
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TRANSFORM_COLS
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TRANSPOSE_4X4
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psllw m0, 2
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psllw m1, 2
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psllw m2, 2
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psllw m3, 2
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movq [outputq], m0
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movq [outputq + 8], m1
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movq [outputq + 16], m2
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movq [outputq + 24], m3
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RET
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