ref: 5cba6516aa020e420106d276bf2dbebc6b517e3f
dir: /vp8/encoder/arm/armv6/walsh_v6.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.
;
EXPORT |vp8_short_walsh4x4_armv6|
ARM
REQUIRE8
PRESERVE8
AREA |.text|, CODE, READONLY ; name this block of code
;short vp8_short_walsh4x4_armv6(short *input, short *output, int pitch)
; r0 short *input,
; r1 short *output,
; r2 int pitch
|vp8_short_walsh4x4_armv6| PROC
stmdb sp!, {r4 - r11, lr}
ldrd r4, r5, [r0], r2
ldr lr, c00040004
ldrd r6, r7, [r0], r2
; 0-3
qadd16 r3, r4, r5 ; [d1|a1] [1+3 | 0+2]
qsub16 r4, r4, r5 ; [c1|b1] [1-3 | 0-2]
ldrd r8, r9, [r0], r2
; 4-7
qadd16 r5, r6, r7 ; [d1|a1] [5+7 | 4+6]
qsub16 r6, r6, r7 ; [c1|b1] [5-7 | 4-6]
ldrd r10, r11, [r0]
; 8-11
qadd16 r7, r8, r9 ; [d1|a1] [9+11 | 8+10]
qsub16 r8, r8, r9 ; [c1|b1] [9-11 | 8-10]
; 12-15
qadd16 r9, r10, r11 ; [d1|a1] [13+15 | 12+14]
qsub16 r10, r10, r11 ; [c1|b1] [13-15 | 12-14]
lsls r2, r3, #16
smuad r11, r3, lr ; A0 = a1<<2 + d1<<2
addne r11, r11, #1 ; A0 += (a1!=0)
lsls r2, r7, #16
smuad r12, r7, lr ; C0 = a1<<2 + d1<<2
addne r12, r12, #1 ; C0 += (a1!=0)
add r0, r11, r12 ; a1_0 = A0 + C0
sub r11, r11, r12 ; b1_0 = A0 - C0
lsls r2, r5, #16
smuad r12, r5, lr ; B0 = a1<<2 + d1<<2
addne r12, r12, #1 ; B0 += (a1!=0)
lsls r2, r9, #16
smuad r2, r9, lr ; D0 = a1<<2 + d1<<2
addne r2, r2, #1 ; D0 += (a1!=0)
add lr, r12, r2 ; d1_0 = B0 + D0
sub r12, r12, r2 ; c1_0 = B0 - D0
; op[0,4,8,12]
adds r2, r0, lr ; a2 = a1_0 + d1_0
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
subs r0, r0, lr ; d2 = a1_0 - d1_0
mov r2, r2, asr #3 ; >> 3
strh r2, [r1] ; op[0]
addmi r0, r0, #1 ; += a2 < 0
add r0, r0, #3 ; += 3
ldr lr, c00040004
mov r0, r0, asr #3 ; >> 3
strh r0, [r1, #24] ; op[12]
adds r2, r11, r12 ; b2 = b1_0 + c1_0
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
subs r0, r11, r12 ; c2 = b1_0 - c1_0
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #8] ; op[4]
addmi r0, r0, #1 ; += a2 < 0
add r0, r0, #3 ; += 3
smusd r3, r3, lr ; A3 = a1<<2 - d1<<2
smusd r7, r7, lr ; C3 = a1<<2 - d1<<2
mov r0, r0, asr #3 ; >> 3
strh r0, [r1, #16] ; op[8]
; op[3,7,11,15]
add r0, r3, r7 ; a1_3 = A3 + C3
sub r3, r3, r7 ; b1_3 = A3 - C3
smusd r5, r5, lr ; B3 = a1<<2 - d1<<2
smusd r9, r9, lr ; D3 = a1<<2 - d1<<2
add r7, r5, r9 ; d1_3 = B3 + D3
sub r5, r5, r9 ; c1_3 = B3 - D3
adds r2, r0, r7 ; a2 = a1_3 + d1_3
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
adds r9, r3, r5 ; b2 = b1_3 + c1_3
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #6] ; op[3]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
subs r2, r3, r5 ; c2 = b1_3 - c1_3
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #14] ; op[7]
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
subs r9, r0, r7 ; d2 = a1_3 - d1_3
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #22] ; op[11]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
smuad r3, r4, lr ; A1 = b1<<2 + c1<<2
smuad r5, r8, lr ; C1 = b1<<2 + c1<<2
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #30] ; op[15]
; op[1,5,9,13]
add r0, r3, r5 ; a1_1 = A1 + C1
sub r3, r3, r5 ; b1_1 = A1 - C1
smuad r7, r6, lr ; B1 = b1<<2 + c1<<2
smuad r9, r10, lr ; D1 = b1<<2 + c1<<2
add r5, r7, r9 ; d1_1 = B1 + D1
sub r7, r7, r9 ; c1_1 = B1 - D1
adds r2, r0, r5 ; a2 = a1_1 + d1_1
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
adds r9, r3, r7 ; b2 = b1_1 + c1_1
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #2] ; op[1]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
subs r2, r3, r7 ; c2 = b1_1 - c1_1
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #10] ; op[5]
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
subs r9, r0, r5 ; d2 = a1_1 - d1_1
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #18] ; op[9]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
smusd r4, r4, lr ; A2 = b1<<2 - c1<<2
smusd r8, r8, lr ; C2 = b1<<2 - c1<<2
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #26] ; op[13]
; op[2,6,10,14]
add r11, r4, r8 ; a1_2 = A2 + C2
sub r12, r4, r8 ; b1_2 = A2 - C2
smusd r6, r6, lr ; B2 = b1<<2 - c1<<2
smusd r10, r10, lr ; D2 = b1<<2 - c1<<2
add r4, r6, r10 ; d1_2 = B2 + D2
sub r8, r6, r10 ; c1_2 = B2 - D2
adds r2, r11, r4 ; a2 = a1_2 + d1_2
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
adds r9, r12, r8 ; b2 = b1_2 + c1_2
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #4] ; op[2]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
subs r2, r12, r8 ; c2 = b1_2 - c1_2
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #12] ; op[6]
addmi r2, r2, #1 ; += a2 < 0
add r2, r2, #3 ; += 3
subs r9, r11, r4 ; d2 = a1_2 - d1_2
mov r2, r2, asr #3 ; >> 3
strh r2, [r1, #20] ; op[10]
addmi r9, r9, #1 ; += a2 < 0
add r9, r9, #3 ; += 3
mov r9, r9, asr #3 ; >> 3
strh r9, [r1, #28] ; op[14]
ldmia sp!, {r4 - r11, pc}
ENDP ; |vp8_short_walsh4x4_armv6|
c00040004
DCD 0x00040004
END