ref: 488c0a54f6aeadd80299fc836083f414be2bccb5
dir: /vp8/common/ppc/variance_altivec.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.
;
.globl vp8_get8x8var_ppc
.globl vp8_get16x16var_ppc
.globl vp8_mse16x16_ppc
.globl vp8_variance16x16_ppc
.globl vp8_variance16x8_ppc
.globl vp8_variance8x16_ppc
.globl vp8_variance8x8_ppc
.globl vp8_variance4x4_ppc
.macro load_aligned_16 V R O
lvsl v3, 0, \R ;# permutate value for alignment
lvx v1, 0, \R
lvx v2, \O, \R
vperm \V, v1, v2, v3
.endm
.macro prologue
mfspr r11, 256 ;# get old VRSAVE
oris r12, r11, 0xffc0
mtspr 256, r12 ;# set VRSAVE
stwu r1, -32(r1) ;# create space on the stack
li r10, 16 ;# load offset and loop counter
vspltisw v7, 0 ;# zero for merging
vspltisw v8, 0 ;# zero out total to start
vspltisw v9, 0 ;# zero out total for dif^2
.endm
.macro epilogue
addi r1, r1, 32 ;# recover stack
mtspr 256, r11 ;# reset old VRSAVE
.endm
.macro compute_sum_sse
;# Compute sum first. Unpack to so signed subract
;# can be used. Only have a half word signed
;# subract. Do high, then low.
vmrghb v2, v7, v4
vmrghb v3, v7, v5
vsubshs v2, v2, v3
vsum4shs v8, v2, v8
vmrglb v2, v7, v4
vmrglb v3, v7, v5
vsubshs v2, v2, v3
vsum4shs v8, v2, v8
;# Now compute sse.
vsububs v2, v4, v5
vsububs v3, v5, v4
vor v2, v2, v3
vmsumubm v9, v2, v2, v9
.endm
.macro variance_16 DS loop_label store_sum
\loop_label:
;# only one of the inputs should need to be aligned.
load_aligned_16 v4, r3, r10
load_aligned_16 v5, r5, r10
;# move onto the next line
add r3, r3, r4
add r5, r5, r6
compute_sum_sse
bdnz \loop_label
vsumsws v8, v8, v7
vsumsws v9, v9, v7
stvx v8, 0, r1
lwz r3, 12(r1)
stvx v9, 0, r1
lwz r4, 12(r1)
.if \store_sum
stw r3, 0(r8) ;# sum
.endif
stw r4, 0(r7) ;# sse
mullw r3, r3, r3 ;# sum*sum
srlwi r3, r3, \DS ;# (sum*sum) >> DS
subf r3, r3, r4 ;# sse - ((sum*sum) >> DS)
.endm
.macro variance_8 DS loop_label store_sum
\loop_label:
;# only one of the inputs should need to be aligned.
load_aligned_16 v4, r3, r10
load_aligned_16 v5, r5, r10
;# move onto the next line
add r3, r3, r4
add r5, r5, r6
;# only one of the inputs should need to be aligned.
load_aligned_16 v6, r3, r10
load_aligned_16 v0, r5, r10
;# move onto the next line
add r3, r3, r4
add r5, r5, r6
vmrghb v4, v4, v6
vmrghb v5, v5, v0
compute_sum_sse
bdnz \loop_label
vsumsws v8, v8, v7
vsumsws v9, v9, v7
stvx v8, 0, r1
lwz r3, 12(r1)
stvx v9, 0, r1
lwz r4, 12(r1)
.if \store_sum
stw r3, 0(r8) ;# sum
.endif
stw r4, 0(r7) ;# sse
mullw r3, r3, r3 ;# sum*sum
srlwi r3, r3, \DS ;# (sum*sum) >> 8
subf r3, r3, r4 ;# sse - ((sum*sum) >> 8)
.endm
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *SSE
;# r8 int *Sum
;#
;# r3 return value
vp8_get8x8var_ppc:
prologue
li r9, 4
mtctr r9
variance_8 6, get8x8var_loop, 1
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *SSE
;# r8 int *Sum
;#
;# r3 return value
vp8_get16x16var_ppc:
prologue
mtctr r10
variance_16 8, get16x16var_loop, 1
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r 3 return value
vp8_mse16x16_ppc:
prologue
mtctr r10
mse16x16_loop:
;# only one of the inputs should need to be aligned.
load_aligned_16 v4, r3, r10
load_aligned_16 v5, r5, r10
;# move onto the next line
add r3, r3, r4
add r5, r5, r6
;# Now compute sse.
vsububs v2, v4, v5
vsububs v3, v5, v4
vor v2, v2, v3
vmsumubm v9, v2, v2, v9
bdnz mse16x16_loop
vsumsws v9, v9, v7
stvx v9, 0, r1
lwz r3, 12(r1)
stvx v9, 0, r1
lwz r3, 12(r1)
stw r3, 0(r7) ;# sse
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r3 return value
vp8_variance16x16_ppc:
prologue
mtctr r10
variance_16 8, variance16x16_loop, 0
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r3 return value
vp8_variance16x8_ppc:
prologue
li r9, 8
mtctr r9
variance_16 7, variance16x8_loop, 0
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r3 return value
vp8_variance8x16_ppc:
prologue
li r9, 8
mtctr r9
variance_8 7, variance8x16_loop, 0
epilogue
blr
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r3 return value
vp8_variance8x8_ppc:
prologue
li r9, 4
mtctr r9
variance_8 6, variance8x8_loop, 0
epilogue
blr
.macro transfer_4x4 I P
lwz r0, 0(\I)
add \I, \I, \P
lwz r10,0(\I)
add \I, \I, \P
lwz r8, 0(\I)
add \I, \I, \P
lwz r9, 0(\I)
stw r0, 0(r1)
stw r10, 4(r1)
stw r8, 8(r1)
stw r9, 12(r1)
.endm
.align 2
;# r3 unsigned char *src_ptr
;# r4 int source_stride
;# r5 unsigned char *ref_ptr
;# r6 int recon_stride
;# r7 unsigned int *sse
;#
;# r3 return value
vp8_variance4x4_ppc:
prologue
transfer_4x4 r3, r4
lvx v4, 0, r1
transfer_4x4 r5, r6
lvx v5, 0, r1
compute_sum_sse
vsumsws v8, v8, v7
vsumsws v9, v9, v7
stvx v8, 0, r1
lwz r3, 12(r1)
stvx v9, 0, r1
lwz r4, 12(r1)
stw r4, 0(r7) ;# sse
mullw r3, r3, r3 ;# sum*sum
srlwi r3, r3, 4 ;# (sum*sum) >> 4
subf r3, r3, r4 ;# sse - ((sum*sum) >> 4)
epilogue
blr