51 lines
1.3 KiB
NASM
51 lines
1.3 KiB
NASM
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; Copyright (c) 2010 The VP8 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 and patent
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; grant that can be found in the LICENSE file in the root of the source
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; tree. All contributing project authors may be found in the AUTHORS
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; file in the root of the source tree.
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;
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.globl vp8_block_error_ppc
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.align 2
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;# r3 short *Coeff
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;# r4 short *dqcoeff
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vp8_block_error_ppc:
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mfspr r11, 256 ;# get old VRSAVE
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oris r12, r11, 0xf800
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mtspr 256, r12 ;# set VRSAVE
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stwu r1,-32(r1) ;# create space on the stack
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stw r5, 12(r1) ;# tranfer dc to vector register
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lvx v0, 0, r3 ;# Coeff
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lvx v1, 0, r4 ;# dqcoeff
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li r10, 16
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vspltisw v3, 0
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vsubshs v0, v0, v1
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vmsumshm v2, v0, v0, v3 ;# multiply differences
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lvx v0, r10, r3 ;# Coeff
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lvx v1, r10, r4 ;# dqcoeff
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vsubshs v0, v0, v1
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vmsumshm v1, v0, v0, v2 ;# multiply differences
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vsumsws v1, v1, v3 ;# sum up
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stvx v1, 0, r1
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lwz r3, 12(r1) ;# return value
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addi r1, r1, 32 ;# recover stack
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mtspr 256, r11 ;# reset old VRSAVE
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