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|
/*
* Simple IDCT
*
* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2006 Mans Rullgard <mru@inprovide.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define W1 22725 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W2 21407 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W3 19266 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W4 16383 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W5 12873 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W6 8867 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define W7 4520 /* cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 */
#define ROW_SHIFT 11
#define COL_SHIFT 20
#define W13 (W1 | (W3 << 16))
#define W26 (W2 | (W6 << 16))
#define W57 (W5 | (W7 << 16))
.text
.align
w13: .long W13
w26: .long W26
w57: .long W57
.align
.func idct_row_armv5te
idct_row_armv5te:
str lr, [sp, #-4]!
ldrd v1, [a1, #8]
ldrd a3, [a1] /* a3 = row[1:0], a4 = row[3:2] */
orrs v1, v1, v2
cmpeq v1, a4
cmpeq v1, a3, lsr #16
beq row_dc_only
mov v1, #(1<<(ROW_SHIFT-1))
mov ip, #16384
sub ip, ip, #1 /* ip = W4 */
smlabb v1, ip, a3, v1 /* v1 = W4*row[0]+(1<<(RS-1)) */
ldr ip, [pc, #(w26-.-8)] /* ip = W2 | (W6 << 16) */
smultb a2, ip, a4
smulbb lr, ip, a4
add v2, v1, a2
sub v3, v1, a2
sub v4, v1, lr
add v1, v1, lr
ldr ip, [pc, #(w13-.-8)] /* ip = W1 | (W3 << 16) */
ldr lr, [pc, #(w57-.-8)] /* lr = W5 | (W7 << 16) */
smulbt v5, ip, a3
smultt v6, lr, a4
smlatt v5, ip, a4, v5
smultt a2, ip, a3
smulbt v7, lr, a3
sub v6, v6, a2
smulbt a2, ip, a4
smultt fp, lr, a3
sub v7, v7, a2
smulbt a2, lr, a4
ldrd a3, [a1, #8] /* a3=row[5:4] a4=row[7:6] */
sub fp, fp, a2
orrs a2, a3, a4
beq 1f
smlabt v5, lr, a3, v5
smlabt v6, ip, a3, v6
smlatt v5, lr, a4, v5
smlabt v6, lr, a4, v6
smlatt v7, lr, a3, v7
smlatt fp, ip, a3, fp
smulbt a2, ip, a4
smlatt v7, ip, a4, v7
sub fp, fp, a2
ldr ip, [pc, #(w26-.-8)] /* ip = W2 | (W6 << 16) */
mov a2, #16384
sub a2, a2, #1 /* a2 = W4 */
smulbb a2, a2, a3 /* a2 = W4*row[4] */
smultb lr, ip, a4 /* lr = W6*row[6] */
add v1, v1, a2 /* v1 += W4*row[4] */
add v1, v1, lr /* v1 += W6*row[6] */
add v4, v4, a2 /* v4 += W4*row[4] */
sub v4, v4, lr /* v4 -= W6*row[6] */
smulbb lr, ip, a4 /* lr = W2*row[6] */
sub v2, v2, a2 /* v2 -= W4*row[4] */
sub v2, v2, lr /* v2 -= W2*row[6] */
sub v3, v3, a2 /* v3 -= W4*row[4] */
add v3, v3, lr /* v3 += W2*row[6] */
1: add a2, v1, v5
mov a3, a2, lsr #11
bic a3, a3, #0x1f0000
sub a2, v2, v6
mov a2, a2, lsr #11
add a3, a3, a2, lsl #16
add a2, v3, v7
mov a4, a2, lsr #11
bic a4, a4, #0x1f0000
add a2, v4, fp
mov a2, a2, lsr #11
add a4, a4, a2, lsl #16
strd a3, [a1]
sub a2, v4, fp
mov a3, a2, lsr #11
bic a3, a3, #0x1f0000
sub a2, v3, v7
mov a2, a2, lsr #11
add a3, a3, a2, lsl #16
add a2, v2, v6
mov a4, a2, lsr #11
bic a4, a4, #0x1f0000
sub a2, v1, v5
mov a2, a2, lsr #11
add a4, a4, a2, lsl #16
strd a3, [a1, #8]
ldr pc, [sp], #4
row_dc_only:
orr a3, a3, a3, lsl #16
bic a3, a3, #0xe000
mov a3, a3, lsl #3
mov a4, a3
strd a3, [a1]
strd a3, [a1, #8]
ldr pc, [sp], #4
.endfunc
.macro idct_col
ldr a4, [a1] /* a4 = col[1:0] */
mov ip, #16384
sub ip, ip, #1 /* ip = W4 */
#if 0
mov v1, #(1<<(COL_SHIFT-1))
smlabt v2, ip, a4, v1 /* v2 = W4*col[1] + (1<<(COL_SHIFT-1)) */
smlabb v1, ip, a4, v1 /* v1 = W4*col[0] + (1<<(COL_SHIFT-1)) */
ldr a4, [a1, #(16*4)]
#else
mov v1, #((1<<(COL_SHIFT-1))/W4) /* this matches the C version */
add v2, v1, a4, asr #16
rsb v2, v2, v2, lsl #14
mov a4, a4, lsl #16
add v1, v1, a4, asr #16
ldr a4, [a1, #(16*4)]
rsb v1, v1, v1, lsl #14
#endif
smulbb lr, ip, a4
smulbt a3, ip, a4
sub v3, v1, lr
sub v5, v1, lr
add v7, v1, lr
add v1, v1, lr
sub v4, v2, a3
sub v6, v2, a3
add fp, v2, a3
ldr ip, [pc, #(w26-.-8)]
ldr a4, [a1, #(16*2)]
add v2, v2, a3
smulbb lr, ip, a4
smultb a3, ip, a4
add v1, v1, lr
sub v7, v7, lr
add v3, v3, a3
sub v5, v5, a3
smulbt lr, ip, a4
smultt a3, ip, a4
add v2, v2, lr
sub fp, fp, lr
add v4, v4, a3
ldr a4, [a1, #(16*6)]
sub v6, v6, a3
smultb lr, ip, a4
smulbb a3, ip, a4
add v1, v1, lr
sub v7, v7, lr
sub v3, v3, a3
add v5, v5, a3
smultt lr, ip, a4
smulbt a3, ip, a4
add v2, v2, lr
sub fp, fp, lr
sub v4, v4, a3
add v6, v6, a3
stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp}
ldr ip, [pc, #(w13-.-8)]
ldr a4, [a1, #(16*1)]
ldr lr, [pc, #(w57-.-8)]
smulbb v1, ip, a4
smultb v3, ip, a4
smulbb v5, lr, a4
smultb v7, lr, a4
smulbt v2, ip, a4
smultt v4, ip, a4
smulbt v6, lr, a4
smultt fp, lr, a4
rsb v4, v4, #0
ldr a4, [a1, #(16*3)]
rsb v3, v3, #0
smlatb v1, ip, a4, v1
smlatb v3, lr, a4, v3
smulbb a3, ip, a4
smulbb a2, lr, a4
sub v5, v5, a3
sub v7, v7, a2
smlatt v2, ip, a4, v2
smlatt v4, lr, a4, v4
smulbt a3, ip, a4
smulbt a2, lr, a4
sub v6, v6, a3
ldr a4, [a1, #(16*5)]
sub fp, fp, a2
smlabb v1, lr, a4, v1
smlabb v3, ip, a4, v3
smlatb v5, lr, a4, v5
smlatb v7, ip, a4, v7
smlabt v2, lr, a4, v2
smlabt v4, ip, a4, v4
smlatt v6, lr, a4, v6
ldr a3, [a1, #(16*7)]
smlatt fp, ip, a4, fp
smlatb v1, lr, a3, v1
smlabb v3, lr, a3, v3
smlatb v5, ip, a3, v5
smulbb a4, ip, a3
smlatt v2, lr, a3, v2
sub v7, v7, a4
smlabt v4, lr, a3, v4
smulbt a4, ip, a3
smlatt v6, ip, a3, v6
sub fp, fp, a4
.endm
.align
.func idct_col_armv5te
idct_col_armv5te:
str lr, [sp, #-4]!
idct_col
ldmfd sp!, {a3, a4}
adds a2, a3, v1
mov a2, a2, lsr #20
orrmi a2, a2, #0xf000
add ip, a4, v2
mov ip, ip, asr #20
orr a2, a2, ip, lsl #16
str a2, [a1]
subs a3, a3, v1
mov a2, a3, lsr #20
orrmi a2, a2, #0xf000
sub a4, a4, v2
mov a4, a4, asr #20
orr a2, a2, a4, lsl #16
ldmfd sp!, {a3, a4}
str a2, [a1, #(16*7)]
subs a2, a3, v3
mov a2, a2, lsr #20
orrmi a2, a2, #0xf000
sub ip, a4, v4
mov ip, ip, asr #20
orr a2, a2, ip, lsl #16
str a2, [a1, #(16*1)]
adds a3, a3, v3
mov a2, a3, lsr #20
orrmi a2, a2, #0xf000
add a4, a4, v4
mov a4, a4, asr #20
orr a2, a2, a4, lsl #16
ldmfd sp!, {a3, a4}
str a2, [a1, #(16*6)]
adds a2, a3, v5
mov a2, a2, lsr #20
orrmi a2, a2, #0xf000
add ip, a4, v6
mov ip, ip, asr #20
orr a2, a2, ip, lsl #16
str a2, [a1, #(16*2)]
subs a3, a3, v5
mov a2, a3, lsr #20
orrmi a2, a2, #0xf000
sub a4, a4, v6
mov a4, a4, asr #20
orr a2, a2, a4, lsl #16
ldmfd sp!, {a3, a4}
str a2, [a1, #(16*5)]
adds a2, a3, v7
mov a2, a2, lsr #20
orrmi a2, a2, #0xf000
add ip, a4, fp
mov ip, ip, asr #20
orr a2, a2, ip, lsl #16
str a2, [a1, #(16*3)]
subs a3, a3, v7
mov a2, a3, lsr #20
orrmi a2, a2, #0xf000
sub a4, a4, fp
mov a4, a4, asr #20
orr a2, a2, a4, lsl #16
str a2, [a1, #(16*4)]
ldr pc, [sp], #4
.endfunc
.align
.func idct_col_put_armv5te
idct_col_put_armv5te:
str lr, [sp, #-4]!
idct_col
ldmfd sp!, {a3, a4}
ldr lr, [sp, #32]
add a2, a3, v1
movs a2, a2, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
add ip, a4, v2
movs ip, ip, asr #20
movmi ip, #0
cmp ip, #255
movgt ip, #255
orr a2, a2, ip, lsl #8
sub a3, a3, v1
movs a3, a3, asr #20
movmi a3, #0
cmp a3, #255
movgt a3, #255
sub a4, a4, v2
movs a4, a4, asr #20
movmi a4, #0
cmp a4, #255
ldr v1, [sp, #28]
movgt a4, #255
strh a2, [v1]
add a2, v1, #2
str a2, [sp, #28]
orr a2, a3, a4, lsl #8
rsb v2, lr, lr, lsl #3
ldmfd sp!, {a3, a4}
strh a2, [v2, v1]!
sub a2, a3, v3
movs a2, a2, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
sub ip, a4, v4
movs ip, ip, asr #20
movmi ip, #0
cmp ip, #255
movgt ip, #255
orr a2, a2, ip, lsl #8
strh a2, [v1, lr]!
add a3, a3, v3
movs a2, a3, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
add a4, a4, v4
movs a4, a4, asr #20
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a2, a4, lsl #8
ldmfd sp!, {a3, a4}
strh a2, [v2, -lr]!
add a2, a3, v5
movs a2, a2, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
add ip, a4, v6
movs ip, ip, asr #20
movmi ip, #0
cmp ip, #255
movgt ip, #255
orr a2, a2, ip, lsl #8
strh a2, [v1, lr]!
sub a3, a3, v5
movs a2, a3, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
sub a4, a4, v6
movs a4, a4, asr #20
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a2, a4, lsl #8
ldmfd sp!, {a3, a4}
strh a2, [v2, -lr]!
add a2, a3, v7
movs a2, a2, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
add ip, a4, fp
movs ip, ip, asr #20
movmi ip, #0
cmp ip, #255
movgt ip, #255
orr a2, a2, ip, lsl #8
strh a2, [v1, lr]
sub a3, a3, v7
movs a2, a3, asr #20
movmi a2, #0
cmp a2, #255
movgt a2, #255
sub a4, a4, fp
movs a4, a4, asr #20
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a2, a4, lsl #8
strh a2, [v2, -lr]
ldr pc, [sp], #4
.endfunc
.align
.func idct_col_add_armv5te
idct_col_add_armv5te:
str lr, [sp, #-4]!
idct_col
ldr lr, [sp, #36]
ldmfd sp!, {a3, a4}
ldrh ip, [lr]
add a2, a3, v1
mov a2, a2, asr #20
sub a3, a3, v1
and v1, ip, #255
adds a2, a2, v1
movmi a2, #0
cmp a2, #255
movgt a2, #255
add v1, a4, v2
mov v1, v1, asr #20
adds v1, v1, ip, lsr #8
movmi v1, #0
cmp v1, #255
movgt v1, #255
orr a2, a2, v1, lsl #8
ldr v1, [sp, #32]
sub a4, a4, v2
rsb v2, v1, v1, lsl #3
ldrh ip, [v2, lr]!
strh a2, [lr]
mov a3, a3, asr #20
and a2, ip, #255
adds a3, a3, a2
movmi a3, #0
cmp a3, #255
movgt a3, #255
mov a4, a4, asr #20
adds a4, a4, ip, lsr #8
movmi a4, #0
cmp a4, #255
movgt a4, #255
add a2, lr, #2
str a2, [sp, #28]
orr a2, a3, a4, lsl #8
strh a2, [v2]
ldmfd sp!, {a3, a4}
ldrh ip, [lr, v1]!
sub a2, a3, v3
mov a2, a2, asr #20
add a3, a3, v3
and v3, ip, #255
adds a2, a2, v3
movmi a2, #0
cmp a2, #255
movgt a2, #255
sub v3, a4, v4
mov v3, v3, asr #20
adds v3, v3, ip, lsr #8
movmi v3, #0
cmp v3, #255
movgt v3, #255
orr a2, a2, v3, lsl #8
add a4, a4, v4
ldrh ip, [v2, -v1]!
strh a2, [lr]
mov a3, a3, asr #20
and a2, ip, #255
adds a3, a3, a2
movmi a3, #0
cmp a3, #255
movgt a3, #255
mov a4, a4, asr #20
adds a4, a4, ip, lsr #8
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a3, a4, lsl #8
strh a2, [v2]
ldmfd sp!, {a3, a4}
ldrh ip, [lr, v1]!
add a2, a3, v5
mov a2, a2, asr #20
sub a3, a3, v5
and v3, ip, #255
adds a2, a2, v3
movmi a2, #0
cmp a2, #255
movgt a2, #255
add v3, a4, v6
mov v3, v3, asr #20
adds v3, v3, ip, lsr #8
movmi v3, #0
cmp v3, #255
movgt v3, #255
orr a2, a2, v3, lsl #8
sub a4, a4, v6
ldrh ip, [v2, -v1]!
strh a2, [lr]
mov a3, a3, asr #20
and a2, ip, #255
adds a3, a3, a2
movmi a3, #0
cmp a3, #255
movgt a3, #255
mov a4, a4, asr #20
adds a4, a4, ip, lsr #8
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a3, a4, lsl #8
strh a2, [v2]
ldmfd sp!, {a3, a4}
ldrh ip, [lr, v1]!
add a2, a3, v7
mov a2, a2, asr #20
sub a3, a3, v7
and v3, ip, #255
adds a2, a2, v3
movmi a2, #0
cmp a2, #255
movgt a2, #255
add v3, a4, fp
mov v3, v3, asr #20
adds v3, v3, ip, lsr #8
movmi v3, #0
cmp v3, #255
movgt v3, #255
orr a2, a2, v3, lsl #8
sub a4, a4, fp
ldrh ip, [v2, -v1]!
strh a2, [lr]
mov a3, a3, asr #20
and a2, ip, #255
adds a3, a3, a2
movmi a3, #0
cmp a3, #255
movgt a3, #255
mov a4, a4, asr #20
adds a4, a4, ip, lsr #8
movmi a4, #0
cmp a4, #255
movgt a4, #255
orr a2, a3, a4, lsl #8
strh a2, [v2]
ldr pc, [sp], #4
.endfunc
.align
.global simple_idct_armv5te
.func simple_idct_armv5te
simple_idct_armv5te:
stmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, lr}
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
sub a1, a1, #(16*7)
bl idct_col_armv5te
add a1, a1, #4
bl idct_col_armv5te
add a1, a1, #4
bl idct_col_armv5te
add a1, a1, #4
bl idct_col_armv5te
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
.align
.global simple_idct_add_armv5te
.func simple_idct_add_armv5te
simple_idct_add_armv5te:
stmfd sp!, {a1, a2, v1, v2, v3, v4, v5, v6, v7, fp, lr}
mov a1, a3
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
sub a1, a1, #(16*7)
bl idct_col_add_armv5te
add a1, a1, #4
bl idct_col_add_armv5te
add a1, a1, #4
bl idct_col_add_armv5te
add a1, a1, #4
bl idct_col_add_armv5te
add sp, sp, #8
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
.align
.global simple_idct_put_armv5te
.func simple_idct_put_armv5te
simple_idct_put_armv5te:
stmfd sp!, {a1, a2, v1, v2, v3, v4, v5, v6, v7, fp, lr}
mov a1, a3
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
add a1, a1, #16
bl idct_row_armv5te
sub a1, a1, #(16*7)
bl idct_col_put_armv5te
add a1, a1, #4
bl idct_col_put_armv5te
add a1, a1, #4
bl idct_col_put_armv5te
add a1, a1, #4
bl idct_col_put_armv5te
add sp, sp, #8
ldmfd sp!, {v1, v2, v3, v4, v5, v6, v7, fp, pc}
.endfunc
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