ref: 4b2c2b9aa4a273a23d90ddb3bbf6dfb3482e0b8f
dir: /vp9/common/arm/armv6/idct_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.
;
; r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r14
EXPORT |vp8_short_idct4x4llm_1_v6|
EXPORT |vp8_short_idct4x4llm_v6|
EXPORT |vp8_short_idct4x4llm_v6_scott|
EXPORT |vp8_short_idct4x4llm_v6_dual|
AREA |.text|, CODE, READONLY
;********************************************************************************
;* void short_idct4x4llm_1_v6(INT16 * input, INT16 * output, INT32 pitch)
;* r0 INT16 * input
;* r1 INT16 * output
;* r2 INT32 pitch
;* bench: 3/5
;********************************************************************************
|vp8_short_idct4x4llm_1_v6| PROC ; cycles in out pit
;
ldrsh r0, [r0] ; load input[0] 1, r0 un 2
add r0, r0, #4 ; 1 +4
stmdb sp!, {r4, r5, lr} ; make room for wide writes 1 backup
mov r0, r0, asr #3 ; (input[0] + 4) >> 3 1, r0 req`d ^1 >> 3
pkhbt r4, r0, r0, lsl #16 ; pack r0 into r4 1, r0 req`d ^1 pack
mov r5, r4 ; expand expand
strd r4, [r1], r2 ; *output = r0, post inc 1
strd r4, [r1], r2 ; 1
strd r4, [r1], r2 ; 1
strd r4, [r1] ; 1
;
ldmia sp!, {r4, r5, pc} ; replace vars, return restore
ENDP ; |vp8_short_idct4x4llm_1_v6|
;********************************************************************************
;********************************************************************************
;********************************************************************************
;********************************************************************************
;* void short_idct4x4llm_v6(INT16 * input, INT16 * output, INT32 pitch)
;* r0 INT16 * input
;* r1 INT16 * output
;* r2 INT32 pitch
;* bench:
;********************************************************************************
|vp8_short_idct4x4llm_v6| PROC ; cycles in out pit
;
stmdb sp!, {r4-r11, lr} ; backup registers 1 backup
;
mov r4, #0x00004E00 ; 1 cst
orr r4, r4, #0x0000007B ; cospi8sqrt2minus1
mov r5, #0x00008A00 ; 1 cst
orr r5, r5, #0x0000008C ; sinpi8sqrt2
;
mov r6, #4 ; i=4 1 i
loop1 ;
ldrsh r12, [r0, #8] ; input[4] 1, r12 unavail 2 [4]
ldrsh r3, [r0, #24] ; input[12] 1, r3 unavail 2 [12]
ldrsh r8, [r0, #16] ; input[8] 1, r8 unavail 2 [8]
ldrsh r7, [r0], #0x2 ; input[0] 1, r7 unavail 2 ++ [0]
smulwb r10, r5, r12 ; ([4] * sinpi8sqrt2) >> 16 1, r10 un 2, r12/r5 ^1 t1
smulwb r11, r4, r3 ; ([12] * cospi8sqrt2minus1) >> 16 1, r11 un 2, r3/r4 ^1 t2
add r9, r7, r8 ; a1 = [0] + [8] 1 a1
sub r7, r7, r8 ; b1 = [0] - [8] 1 b1
add r11, r3, r11 ; temp2 1
rsb r11, r11, r10 ; c1 = temp1 - temp2 1 c1
smulwb r3, r5, r3 ; ([12] * sinpi8sqrt2) >> 16 1, r3 un 2, r3/r5 ^ 1 t2
smulwb r10, r4, r12 ; ([4] * cospi8sqrt2minus1) >> 16 1, r10 un 2, r12/r4 ^1 t1
add r8, r7, r11 ; b1 + c1 1 b+c
strh r8, [r1, r2] ; out[pitch] = b1+c1 1
sub r7, r7, r11 ; b1 - c1 1 b-c
add r10, r12, r10 ; temp1 1
add r3, r10, r3 ; d1 = temp1 + temp2 1 d1
add r10, r9, r3 ; a1 + d1 1 a+d
sub r3, r9, r3 ; a1 - d1 1 a-d
add r8, r2, r2 ; pitch * 2 1 p*2
strh r7, [r1, r8] ; out[pitch*2] = b1-c1 1
add r7, r2, r2, lsl #1 ; pitch * 3 1 p*3
strh r3, [r1, r7] ; out[pitch*3] = a1-d1 1
subs r6, r6, #1 ; i-- 1 --
strh r10, [r1], #0x2 ; out[0] = a1+d1 1 ++
bne loop1 ; if i>0, continue
;
sub r1, r1, #8 ; set up out for next loop 1 -4
; for this iteration, input=prev output
mov r6, #4 ; i=4 1 i
; b returnfull
loop2 ;
ldrsh r11, [r1, #2] ; input[1] 1, r11 un 2 [1]
ldrsh r8, [r1, #6] ; input[3] 1, r8 un 2 [3]
ldrsh r3, [r1, #4] ; input[2] 1, r3 un 2 [2]
ldrsh r0, [r1] ; input[0] 1, r0 un 2 [0]
smulwb r9, r5, r11 ; ([1] * sinpi8sqrt2) >> 16 1, r9 un 2, r5/r11 ^1 t1
smulwb r10, r4, r8 ; ([3] * cospi8sqrt2minus1) >> 16 1, r10 un 2, r4/r8 ^1 t2
add r7, r0, r3 ; a1 = [0] + [2] 1 a1
sub r0, r0, r3 ; b1 = [0] - [2] 1 b1
add r10, r8, r10 ; temp2 1
rsb r9, r10, r9 ; c1 = temp1 - temp2 1 c1
smulwb r8, r5, r8 ; ([3] * sinpi8sqrt2) >> 16 1, r8 un 2, r5/r8 ^1 t2
smulwb r10, r4, r11 ; ([1] * cospi8sqrt2minus1) >> 16 1, r10 un 2, r4/r11 ^1 t1
add r3, r0, r9 ; b1+c1 1 b+c
add r3, r3, #4 ; b1+c1+4 1 +4
add r10, r11, r10 ; temp1 1
mov r3, r3, asr #3 ; b1+c1+4 >> 3 1, r3 ^1 >>3
strh r3, [r1, #2] ; out[1] = b1+c1 1
add r10, r10, r8 ; d1 = temp1 + temp2 1 d1
add r3, r7, r10 ; a1+d1 1 a+d
add r3, r3, #4 ; a1+d1+4 1 +4
sub r7, r7, r10 ; a1-d1 1 a-d
add r7, r7, #4 ; a1-d1+4 1 +4
mov r3, r3, asr #3 ; a1+d1+4 >> 3 1, r3 ^1 >>3
mov r7, r7, asr #3 ; a1-d1+4 >> 3 1, r7 ^1 >>3
strh r7, [r1, #6] ; out[3] = a1-d1 1
sub r0, r0, r9 ; b1-c1 1 b-c
add r0, r0, #4 ; b1-c1+4 1 +4
subs r6, r6, #1 ; i-- 1 --
mov r0, r0, asr #3 ; b1-c1+4 >> 3 1, r0 ^1 >>3
strh r0, [r1, #4] ; out[2] = b1-c1 1
strh r3, [r1], r2 ; out[0] = a1+d1 1
; add r1, r1, r2 ; out += pitch 1 ++
bne loop2 ; if i>0, continue
returnfull ;
ldmia sp!, {r4 - r11, pc} ; replace vars, return restore
ENDP
;********************************************************************************
;********************************************************************************
;********************************************************************************
;********************************************************************************
;* void short_idct4x4llm_v6_scott(INT16 * input, INT16 * output, INT32 pitch)
;* r0 INT16 * input
;* r1 INT16 * output
;* r2 INT32 pitch
;* bench:
;********************************************************************************
|vp8_short_idct4x4llm_v6_scott| PROC ; cycles in out pit
; mov r0, #0 ;
; ldr r0, [r0] ;
stmdb sp!, {r4 - r11, lr} ; backup registers 1 backup
;
mov r3, #0x00004E00 ; cos
orr r3, r3, #0x0000007B ; cospi8sqrt2minus1
mov r4, #0x00008A00 ; sin
orr r4, r4, #0x0000008C ; sinpi8sqrt2
;
mov r5, #0x2 ; i i
;
short_idct4x4llm_v6_scott_loop1 ;
ldr r10, [r0, #(4*2)] ; i5 | i4 5,4
ldr r11, [r0, #(12*2)] ; i13 | i12 13,12
;
smulwb r6, r4, r10 ; ((ip[4] * sinpi8sqrt2) >> 16) lt1
smulwb r7, r3, r11 ; ((ip[12] * cospi8sqrt2minus1) >> 16) lt2
;
smulwb r12, r3, r10 ; ((ip[4] * cospi8sqrt2misu1) >> 16) l2t2
smulwb r14, r4, r11 ; ((ip[12] * sinpi8sqrt2) >> 16) l2t1
;
add r6, r6, r7 ; partial c1 lt1-lt2
add r12, r12, r14 ; partial d1 l2t2+l2t1
;
smulwt r14, r4, r10 ; ((ip[5] * sinpi8sqrt2) >> 16) ht1
smulwt r7, r3, r11 ; ((ip[13] * cospi8sqrt2minus1) >> 16) ht2
;
smulwt r8, r3, r10 ; ((ip[5] * cospi8sqrt2minus1) >> 16) h2t1
smulwt r9, r4, r11 ; ((ip[13] * sinpi8sqrt2) >> 16) h2t2
;
add r7, r14, r7 ; partial c1_2 ht1+ht2
sub r8, r8, r9 ; partial d1_2 h2t1-h2t2
;
pkhbt r6, r6, r7, lsl #16 ; partial c1_2 | partial c1_1 pack
pkhbt r12, r12, r8, lsl #16 ; partial d1_2 | partial d1_1 pack
;
usub16 r6, r6, r10 ; c1_2 | c1_1 c
uadd16 r12, r12, r11 ; d1_2 | d1_1 d
;
ldr r10, [r0, #0] ; i1 | i0 1,0
ldr r11, [r0, #(8*2)] ; i9 | i10 9,10
;
;;;;;; add r0, r0, #0x4 ; +4
;;;;;; add r1, r1, #0x4 ; +4
;
uadd16 r8, r10, r11 ; i1 + i9 | i0 + i8 aka a1 a
usub16 r9, r10, r11 ; i1 - i9 | i0 - i8 aka b1 b
;
uadd16 r7, r8, r12 ; a1 + d1 pair a+d
usub16 r14, r8, r12 ; a1 - d1 pair a-d
;
str r7, [r1] ; op[0] = a1 + d1
str r14, [r1, r2] ; op[pitch*3] = a1 - d1
;
add r0, r0, #0x4 ; op[pitch] = b1 + c1 ++
add r1, r1, #0x4 ; op[pitch*2] = b1 - c1 ++
;
subs r5, r5, #0x1 ; --
bne short_idct4x4llm_v6_scott_loop1 ;
;
sub r1, r1, #16 ; reset output ptr
mov r5, #0x4 ;
mov r0, r1 ; input = output
;
short_idct4x4llm_v6_scott_loop2 ;
;
subs r5, r5, #0x1 ;
bne short_idct4x4llm_v6_scott_loop2 ;
;
ldmia sp!, {r4 - r11, pc} ;
ENDP ;
;
;********************************************************************************
;********************************************************************************
;********************************************************************************
;********************************************************************************
;* void short_idct4x4llm_v6_dual(INT16 * input, INT16 * output, INT32 pitch)
;* r0 INT16 * input
;* r1 INT16 * output
;* r2 INT32 pitch
;* bench:
;********************************************************************************
|vp8_short_idct4x4llm_v6_dual| PROC ; cycles in out pit
;
stmdb sp!, {r4-r11, lr} ; backup registers 1 backup
mov r3, #0x00004E00 ; cos
orr r3, r3, #0x0000007B ; cospi8sqrt2minus1
mov r4, #0x00008A00 ; sin
orr r4, r4, #0x0000008C ; sinpi8sqrt2
mov r5, #0x2 ; i=2 i
loop1_dual
ldr r6, [r0, #(4*2)] ; i5 | i4 5|4
ldr r12, [r0, #(12*2)] ; i13 | i12 13|12
ldr r14, [r0, #(8*2)] ; i9 | i8 9|8
smulwt r9, r3, r6 ; (ip[5] * cospi8sqrt2minus1) >> 16 5c
smulwb r7, r3, r6 ; (ip[4] * cospi8sqrt2minus1) >> 16 4c
smulwt r10, r4, r6 ; (ip[5] * sinpi8sqrt2) >> 16 5s
smulwb r8, r4, r6 ; (ip[4] * sinpi8sqrt2) >> 16 4s
pkhbt r7, r7, r9, lsl #16 ; 5c | 4c
smulwt r11, r3, r12 ; (ip[13] * cospi8sqrt2minus1) >> 16 13c
pkhbt r8, r8, r10, lsl #16 ; 5s | 4s
uadd16 r6, r6, r7 ; 5c+5 | 4c+4
smulwt r7, r4, r12 ; (ip[13] * sinpi8sqrt2) >> 16 13s
smulwb r9, r3, r12 ; (ip[12] * cospi8sqrt2minus1) >> 16 12c
smulwb r10, r4, r12 ; (ip[12] * sinpi8sqrt2) >> 16 12s
subs r5, r5, #0x1 ; i-- --
pkhbt r9, r9, r11, lsl #16 ; 13c | 12c
ldr r11, [r0], #0x4 ; i1 | i0 ++ 1|0
pkhbt r10, r10, r7, lsl #16 ; 13s | 12s
uadd16 r7, r12, r9 ; 13c+13 | 12c+12
usub16 r7, r8, r7 ; c c
uadd16 r6, r6, r10 ; d d
uadd16 r10, r11, r14 ; a a
usub16 r8, r11, r14 ; b b
uadd16 r9, r10, r6 ; a+d a+d
usub16 r10, r10, r6 ; a-d a-d
uadd16 r6, r8, r7 ; b+c b+c
usub16 r7, r8, r7 ; b-c b-c
str r6, [r1, r2] ; o5 | o4
add r6, r2, r2 ; pitch * 2 p2
str r7, [r1, r6] ; o9 | o8
add r6, r6, r2 ; pitch * 3 p3
str r10, [r1, r6] ; o13 | o12
str r9, [r1], #0x4 ; o1 | o0 ++
bne loop1_dual ;
mov r5, #0x2 ; i=2 i
sub r0, r1, #8 ; reset input/output i/o
loop2_dual
ldr r6, [r0, r2] ; i5 | i4 5|4
ldr r1, [r0] ; i1 | i0 1|0
ldr r12, [r0, #0x4] ; i3 | i2 3|2
add r14, r2, #0x4 ; pitch + 2 p+2
ldr r14, [r0, r14] ; i7 | i6 7|6
smulwt r9, r3, r6 ; (ip[5] * cospi8sqrt2minus1) >> 16 5c
smulwt r7, r3, r1 ; (ip[1] * cospi8sqrt2minus1) >> 16 1c
smulwt r10, r4, r6 ; (ip[5] * sinpi8sqrt2) >> 16 5s
smulwt r8, r4, r1 ; (ip[1] * sinpi8sqrt2) >> 16 1s
pkhbt r11, r6, r1, lsl #16 ; i0 | i4 0|4
pkhbt r7, r9, r7, lsl #16 ; 1c | 5c
pkhbt r8, r10, r8, lsl #16 ; 1s | 5s = temp1 � tc1
pkhtb r1, r1, r6, asr #16 ; i1 | i5 1|5
uadd16 r1, r7, r1 ; 1c+1 | 5c+5 = temp2 (d) td2
pkhbt r9, r14, r12, lsl #16 ; i2 | i6 2|6
uadd16 r10, r11, r9 ; a a
usub16 r9, r11, r9 ; b b
pkhtb r6, r12, r14, asr #16 ; i3 | i7 3|7
subs r5, r5, #0x1 ; i-- --
smulwt r7, r3, r6 ; (ip[3] * cospi8sqrt2minus1) >> 16 3c
smulwt r11, r4, r6 ; (ip[3] * sinpi8sqrt2) >> 16 3s
smulwb r12, r3, r6 ; (ip[7] * cospi8sqrt2minus1) >> 16 7c
smulwb r14, r4, r6 ; (ip[7] * sinpi8sqrt2) >> 16 7s
pkhbt r7, r12, r7, lsl #16 ; 3c | 7c
pkhbt r11, r14, r11, lsl #16 ; 3s | 7s = temp1 (d) td1
uadd16 r6, r7, r6 ; 3c+3 | 7c+7 = temp2 (c) tc2
usub16 r12, r8, r6 ; c (o1 | o5) c
uadd16 r6, r11, r1 ; d (o3 | o7) d
uadd16 r7, r10, r6 ; a+d a+d
mov r8, #0x4 ; set up 4's 4
orr r8, r8, #0x40000 ; 4|4
usub16 r6, r10, r6 ; a-d a-d
uadd16 r6, r6, r8 ; a-d+4 3|7
uadd16 r7, r7, r8 ; a+d+4 0|4
uadd16 r10, r9, r12 ; b+c b+c
usub16 r1, r9, r12 ; b-c b-c
uadd16 r10, r10, r8 ; b+c+4 1|5
uadd16 r1, r1, r8 ; b-c+4 2|6
mov r8, r10, asr #19 ; o1 >> 3
strh r8, [r0, #2] ; o1
mov r8, r1, asr #19 ; o2 >> 3
strh r8, [r0, #4] ; o2
mov r8, r6, asr #19 ; o3 >> 3
strh r8, [r0, #6] ; o3
mov r8, r7, asr #19 ; o0 >> 3
strh r8, [r0], r2 ; o0 +p
sxth r10, r10 ;
mov r8, r10, asr #3 ; o5 >> 3
strh r8, [r0, #2] ; o5
sxth r1, r1 ;
mov r8, r1, asr #3 ; o6 >> 3
strh r8, [r0, #4] ; o6
sxth r6, r6 ;
mov r8, r6, asr #3 ; o7 >> 3
strh r8, [r0, #6] ; o7
sxth r7, r7 ;
mov r8, r7, asr #3 ; o4 >> 3
strh r8, [r0], r2 ; o4 +p
;;;;; subs r5, r5, #0x1 ; i-- --
bne loop2_dual ;
;
ldmia sp!, {r4 - r11, pc} ; replace vars, return restore
ENDP
END