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rockbox/apps/plugins/mpegplayer/idct_arm.S
Jens Arnold 36eeecbe9a * Fix overlooked r12 usage possibility in mpegplayer ARM idct 
* ARM dualcore: Don't save r12 in switch_thread_core()


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21830 a1c6a512-1295-4272-9138-f99709370657
2009-07-12 22:43:24 +00:00

441 lines
14 KiB
ArmAsm
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
.global mpeg2_idct_copy
.type mpeg2_idct_copy, %function
.global mpeg2_idct_add
.type mpeg2_idct_add, %function
/* Custom calling convention:
* r0 contains block pointer and is non-volatile
* all non-volatile c context saved and restored on its behalf
*/
.idct:
add r12, r0, #128
1:
ldrsh r1, [r0, #0] /* d0 */
ldrsh r2, [r0, #2] /* d1 */
ldrsh r3, [r0, #4] /* d2 */
ldrsh r4, [r0, #6] /* d3 */
ldrsh r5, [r0, #8] /* d0 */
ldrsh r6, [r0, #10] /* d1 */
ldrsh r7, [r0, #12] /* d2 */
ldrsh r8, [r0, #14] /* d3 */
orrs r9, r2, r3
orreqs r9, r4, r5
orreqs r9, r6, r7
cmpeq r8, #0
bne 2f
mov r1, r1, asl #15
bic r1, r1, #0x8000
orr r1, r1, r1, lsr #16
str r1, [r0], #4
str r1, [r0], #4
str r1, [r0], #4
str r1, [r0], #4
cmp r0, r12
blo 1b
b 3f
2:
mov r1, r1, asl #11 /* r1 = d0 = (block[0] << 11) + 2048 */
add r1, r1, #2048
add r1, r1, r3, asl #11 /* r1 = t0 = d0 + (block[2] << 11) */
sub r3, r1, r3, asl #12 /* r3 = t1 = d0 - (block[2] << 11) */
add r9, r2, r4 /* r9 = tmp = (d1+d3)*(1108/4) */
add r10, r9, r9, asl #2
add r10, r10, r9, asl #4
add r9, r10, r9, asl #8
add r10, r2, r2, asl #4 /* r2 = t2 = tmp + (d1*(1568/32)*8) */
add r2, r10, r2, asl #5
add r2, r9, r2, asl #3
add r10, r4, r4, asl #2 /* r4 = t3 = tmp - (d3*(3784/8)*2) */
rsb r10, r10, r4, asl #6
add r4, r4, r10, asl #3
sub r4, r9, r4, asl #1
/* t2 & t3 are 1/4 final value here */
add r1, r1, r2, asl #2 /* r1 = a0 = t0 + t2 */
sub r2, r1, r2, asl #3 /* r2 = a3 = t0 - t2 */
add r3, r3, r4, asl #2 /* r3 = a1 = t1 + t3 */
sub r4, r3, r4, asl #3 /* r4 = a2 = t1 - t3 */
add r9, r8, r5 /* r9 = tmp = 565*(d3 + d0) */
add r10, r9, r9, asl #4
add r10, r10, r10, asl #5
add r9, r10, r9, asl #2
add r10, r5, r5, asl #4 /* r5 = t0 = tmp + (((2276/4)*d0)*4) */
add r10, r10, r10, asl #5
add r5, r10, r5, asl #3
add r5, r9, r5, asl #2
add r10, r8, r8, asl #2 /* r8 = t1 = tmp - (((3406/2)*d3)*2) */
add r10, r10, r10, asl #4
add r10, r10, r8, asl #7
rsb r8, r8, r10, asl #3
sub r8, r9, r8, asl #1
add r9, r6, r7 /* r9 = tmp = (2408/8)*(d1 + d2) */
add r10, r9, r9, asl #3
add r10, r10, r10, asl #5
add r9, r10, r9, asl #2
add r10, r7, r7, asl #3 /* r7 = t2 = (tmp*8) - 799*d2 */
add r10, r10, r7, asl #4
rsb r7, r7, r10, asl #5
rsb r7, r7, r9, asl #3
sub r10, r6, r6, asl #4 /* r6 = t3 = (tmp*8) - 4017*d1 */
sub r10, r10, r6, asl #6
add r10, r10, r6, asl #12
add r6, r10, r6
rsb r6, r6, r9, asl #3
/* t0 = r5, t1 = r8, t2 = r7, t3 = r6*/
add r9, r5, r7 /* r9 = b0 = t0 + t2 */
add r10, r8, r6 /* r10 = b3 = t1 + t3 */
sub r5, r5, r7 /* t0 -= t2 */
sub r8, r8, r6 /* t1 -= t3 */
add r6, r5, r8 /* r6 = t0 + t1 */
sub r7, r5, r8 /* r7 = t0 - t1 */
add r11, r6, r6, asr #2 /* r6 = b1 = r6*(181/128) */
add r11, r11, r11, asr #5
add r6, r11, r6, asr #3
add r11, r7, r7, asr #2 /* r7 = b2 = r7*(181/128) */
add r11, r11, r11, asr #5
add r7, r11, r7, asr #3
/* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */
/* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */
add r5, r1, r9 /* block[0] = (a0 + b0) >> 12 */
mov r5, r5, asr #12
strh r5, [r0], #2
add r8, r3, r6, asr #1 /* block[1] = (a1 + b1) >> 12 */
mov r8, r8, asr #12
strh r8, [r0], #2
add r5, r4, r7, asr #1 /* block[2] = (a2 + b2) >> 12 */
mov r5, r5, asr #12
strh r5, [r0], #2
add r8, r2, r10 /* block[3] = (a3 + b3) >> 12 */
mov r8, r8, asr #12
strh r8, [r0], #2
sub r5, r2, r10 /* block[4] = (a3 - b3) >> 12 */
mov r5, r5, asr #12
strh r5, [r0], #2
sub r8, r4, r7, asr #1 /* block[5] = (a2 - b2) >> 12 */
mov r8, r8, asr #12
strh r8, [r0], #2
sub r5, r3, r6, asr #1 /* block[6] = (a1 - b1) >> 12 */
mov r5, r5, asr #12
strh r5, [r0], #2
sub r8, r1, r9 /* block[7] = (a0 - b0) >> 12 */
mov r8, r8, asr #12
strh r8, [r0], #2
cmp r0, r12
blo 1b
3:
sub r0, r0, #128
add r12, r0, #16
4:
ldrsh r1, [r0, #0*8] /* d0 */
ldrsh r2, [r0, #2*8] /* d1 */
ldrsh r3, [r0, #4*8] /* d2 */
ldrsh r4, [r0, #6*8] /* d3 */
ldrsh r5, [r0, #8*8] /* d0 */
ldrsh r6, [r0, #10*8] /* d1 */
ldrsh r7, [r0, #12*8] /* d2 */
ldrsh r8, [r0, #14*8] /* d3 */
mov r1, r1, asl #11 /* r1 = d0 = (block[0] << 11) + 2048 */
add r1, r1, #65536
add r1, r1, r3, asl #11 /* r1 = t0 = d0 + d2:(block[2] << 11) */
sub r3, r1, r3, asl #12 /* r3 = t1 = d0 - d2:(block[2] << 11) */
add r9, r2, r4 /* r9 = tmp = (d1+d3)*(1108/4) */
add r10, r9, r9, asl #2
add r10, r10, r9, asl #4
add r9, r10, r9, asl #8
add r11, r2, r2, asl #4 /* r2 = t2 = tmp + (d1*(1568/32)*8) */
add r2, r11, r2, asl #5
add r2, r9, r2, asl #3
add r10, r4, r4, asl #2 /* r4 = t3 = tmp - (d3*(3784/8)*2) */
rsb r10, r10, r4, asl #6
add r4, r4, r10, asl #3
sub r4, r9, r4, asl #1
/* t2 & t3 are 1/4 final value here */
add r1, r1, r2, asl #2 /* r1 = a0 = t0 + t2 */
sub r2, r1, r2, asl #3 /* r2 = a3 = t0 - t2 */
add r3, r3, r4, asl #2 /* r3 = a1 = t1 + t3 */
sub r4, r3, r4, asl #3 /* r4 = a2 = t1 - t3 */
add r9, r8, r5 /* r9 = tmp = 565*(d3 + d0) */
add r10, r9, r9, asl #4
add r10, r10, r10, asl #5
add r9, r10, r9, asl #2
add r10, r5, r5, asl #4 /* r5 = t0 = tmp + (((2276/4)*d0)*4) */
add r10, r10, r10, asl #5
add r5, r10, r5, asl #3
add r5, r9, r5, asl #2
add r10, r8, r8, asl #2 /* r8 = t1 = tmp - (((3406/2)*d3)*2) */
add r10, r10, r10, asl #4
add r10, r10, r8, asl #7
rsb r8, r8, r10, asl #3
sub r8, r9, r8, asl #1
add r9, r6, r7 /* r9 = tmp = (2408/8)*(d1 + d2) */
add r10, r9, r9, asl #3
add r10, r10, r10, asl #5
add r9, r10, r9, asl #2
add r10, r7, r7, asl #3 /* r7 = t2 = (tmp*8) - 799*d2 */
add r10, r10, r7, asl #4
rsb r7, r7, r10, asl #5
rsb r7, r7, r9, asl #3
sub r10, r6, r6, asl #4 /* r6 = t3 = (tmp*8) - 4017*d1 */
sub r10, r10, r6, asl #6
add r10, r10, r6, asl #12
add r6, r10, r6
rsb r6, r6, r9, asl #3
/* t0=r5, t1=r8, t2=r7, t3=r6*/
add r9, r5, r7 /* r9 = b0 = t0 + t2 */
add r10, r8, r6 /* r10 = b3 = t1 + t3 */
sub r5, r5, r7 /* t0 -= t2 */
sub r8, r8, r6 /* t1 -= t3 */
add r6, r5, r8 /* r6 = t0 + t1 */
sub r7, r5, r8 /* r7 = t0 - t1 */
add r11, r6, r6, asr #2 /* r6 = b1 = r5*(181/128) */
add r11, r11, r11, asr #5
add r6, r11, r6, asr #3
add r11, r7, r7, asr #2 /* r7 = b2 = r6*(181/128) */
add r11, r11, r11, asr #5
add r7, r11, r7, asr #3
/* r1 = a0, r3 = a1, r4 = a2, r2 = a3 */
/* r9 = b0, r6 = b1*2, r7 = b2*2, r10 = b3 */
add r5, r1, r9 /* block[0] = (a0 + b0) >> 17 */
mov r5, r5, asr #17
strh r5, [r0, #0*8]
add r8, r3, r6, asr #1 /* block[1] = (a1 + b1) >> 17 */
mov r8, r8, asr #17
strh r8, [r0, #2*8]
add r5, r4, r7, asr #1 /* block[2] = (a2 + b2) >> 17 */
mov r5, r5, asr #17
strh r5, [r0, #4*8]
add r8, r2, r10 /* block[3] = (a3 + b3) >> 17 */
mov r8, r8, asr #17
strh r8, [r0, #6*8]
sub r5, r2, r10 /* block[4] = (a3 - b3) >> 17 */
mov r5, r5, asr #17
strh r5, [r0, #8*8]
sub r8, r4, r7, asr #1 /* block[5] = (a2 - b2) >> 17 */
mov r8, r8, asr #17
strh r8, [r0, #10*8]
sub r5, r3, r6, asr #1 /* block[6] = (a1 - b1) >> 17 */
mov r5, r5, asr #17
strh r5, [r0, #12*8]
sub r8, r1, r9 /* block[7] = (a0 - b0) >> 17 */
mov r8, r8, asr #17
strh r8, [r0, #14*8]
add r0, r0, #2
cmp r0, r12
blo 4b
sub r0, r0, #16
bx lr
mpeg2_idct_copy:
stmfd sp!, { r1-r2, r4-r11, lr }
bl .idct
ldmfd sp!, { r1-r2 }
mov r11, #0
add r12, r0, #128
1:
ldrsh r3, [r0, #0]
ldrsh r4, [r0, #2]
ldrsh r5, [r0, #4]
ldrsh r6, [r0, #6]
ldrsh r7, [r0, #8]
ldrsh r8, [r0, #10]
ldrsh r9, [r0, #12]
ldrsh r10, [r0, #14]
cmp r3, #255
mvnhi r3, r3, asr #31
strb r3, [r1, #0]
str r11, [r0], #4
cmp r4, #255
mvnhi r4, r4, asr #31
strb r4, [r1, #1]
cmp r5, #255
mvnhi r5, r5, asr #31
strb r5, [r1, #2]
str r11, [r0], #4
cmp r6, #255
mvnhi r6, r6, asr #31
strb r6, [r1, #3]
cmp r7, #255
mvnhi r7, r7, asr #31
strb r7, [r1, #4]
str r11, [r0], #4
cmp r8, #255
mvnhi r8, r8, asr #31
strb r8, [r1, #5]
cmp r9, #255
mvnhi r9, r9, asr #31
strb r9, [r1, #6]
str r11, [r0], #4
cmp r10, #255
mvnhi r10, r10, asr #31
strb r10, [r1, #7]
add r1, r1, r2
cmp r0, r12
blo 1b
ldmfd sp!, { r4-r11, pc }
mpeg2_idct_add:
cmp r0, #129
mov r0, r1
ldreqsh r1, [r0, #0]
bne 1f
and r1, r1, #0x70
cmp r1, #0x40
bne 3f
1:
stmfd sp!, { r2-r11, lr }
bl .idct
ldmfd sp!, { r1-r2 }
mov r11, #0
add r12, r0, #128
2:
ldrb r3, [r1, #0]
ldrb r4, [r1, #1]
ldrb r5, [r1, #2]
ldrb r6, [r1, #3]
ldrsh r7, [r0, #0]
ldrsh r8, [r0, #2]
ldrsh r9, [r0, #4]
ldrsh r10, [r0, #6]
add r7, r7, r3
ldrb r3, [r1, #4]
cmp r7, #255
mvnhi r7, r7, asr #31
strb r7, [r1, #0]
ldrsh r7, [r0, #8]
add r8, r8, r4
ldrb r4, [r1, #5]
cmp r8, #255
mvnhi r8, r8, asr #31
strb r8, [r1, #1]
ldrsh r8, [r0, #10]
add r9, r9, r5
ldrb r5, [r1, #6]
cmp r9, #255
mvnhi r9, r9, asr #31
strb r9, [r1, #2]
ldrsh r9, [r0, #12]
add r10, r10, r6
ldrb r6, [r1, #7]
cmp r10, #255
mvnhi r10, r10, asr #31
strb r10, [r1, #3]
ldrsh r10, [r0, #14]
str r11, [r0], #4
add r7, r7, r3
cmp r7, #255
mvnhi r7, r7, asr #31
strb r7, [r1, #4]
str r11, [r0], #4
add r8, r8, r4
cmp r8, #255
mvnhi r8, r8, asr #31
strb r8, [r1, #5]
str r11, [r0], #4
add r9, r9, r5
cmp r9, #255
mvnhi r9, r9, asr #31
strb r9, [r1, #6]
add r10, r10, r6
cmp r10, #255
mvnhi r10, r10, asr #31
strb r10, [r1, #7]
str r11, [r0], #4
add r1, r1, r2
cmp r0, r12
blo 2b
ldmfd sp!, { r4-r11, pc }
3:
stmfd sp!, { r4-r5, lr }
ldrsh r1, [r0, #0] /* r1 = block[0] */
mov r4, #0
strh r4, [r0, #0] /* block[0] = 0 */
strh r4, [r0, #126] /* block[63] = 0 */
add r1, r1, #64 /* r1 = DC << 7 */
add r0, r2, r3, asl #3
4:
ldrb r4, [r2, #0]
ldrb r5, [r2, #1]
ldrb r12, [r2, #2]
ldrb lr, [r2, #3]
add r4, r4, r1, asr #7
cmp r4, #255
mvnhi r4, r4, asr #31
strb r4, [r2, #0]
add r5, r5, r1, asr #7
cmp r5, #255
mvnhi r5, r5, asr #31
strb r5, [r2, #1]
add r12, r12, r1, asr #7
cmp r12, #255
mvnhi r12, r12, asr #31
strb r12, [r2, #2]
add lr, lr, r1, asr #7
cmp lr, #255
mvnhi lr, lr, asr #31
strb lr, [r2, #3]
ldrb r4, [r2, #4]
ldrb r5, [r2, #5]
ldrb r12, [r2, #6]
ldrb lr, [r2, #7]
add r4, r4, r1, asr #7
cmp r4, #255
mvnhi r4, r4, asr #31
strb r4, [r2, #4]
add r5, r5, r1, asr #7
cmp r5, #255
mvnhi r5, r5, asr #31
strb r5, [r2, #5]
add r12, r12, r1, asr #7
cmp r12, #255
mvnhi r12, r12, asr #31
strb r12, [r2, #6]
add lr, lr, r1, asr #7
cmp lr, #255
mvnhi lr, lr, asr #31
strb lr, [r2, #7]
add r2, r2, r3
cmp r2, r0
blo 4b
ldmfd sp!, { r4-r5, pc }
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