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foxbox/apps/codecs/libmad/imdct_l_arm.S
Dave Chapman 98c4f65f3a Initial check-in of unmodified libmad code (libmad-0.15.1b) 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5955 a1c6a512-1295-4272-9138-f99709370657
2005-02-15 18:29:42 +00:00

1000 lines
34 KiB
ArmAsm
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/*****************************************************************************
* Copyright (C) 2000-2001 Andre McCurdy <armccurdy@yahoo.co.uk>
*
* 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 program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program@ if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*****************************************************************************
*
* Notes:
*
*
*****************************************************************************
*
* $Id$
*
* 2001/03/24: Andre McCurdy <armccurdy@yahoo.co.uk>
* - Corrected PIC unsafe loading of address of 'imdct36_long_karray'
*
* 2000/09/20: Robert Leslie <rob@mars.org>
* - Added a global symbol with leading underscore per suggestion of
* Simon Burge to support linking with the a.out format.
*
* 2000/09/15: Robert Leslie <rob@mars.org>
* - Fixed a small bug where flags were changed before a conditional branch.
*
* 2000/09/15: Andre McCurdy <armccurdy@yahoo.co.uk>
* - Applied Nicolas Pitre's rounding optimisation in all remaining places.
*
* 2000/09/09: Nicolas Pitre <nico@cam.org>
* - Optimized rounding + scaling operations.
*
* 2000/08/09: Andre McCurdy <armccurdy@yahoo.co.uk>
* - Original created.
*
****************************************************************************/
/*
On entry:
r0 = pointer to 18 element input array
r1 = pointer to 36 element output array
r2 = windowing block type
Stack frame created during execution of the function:
Initial Holds:
Stack
pointer
minus:
0
4 lr
8 r11
12 r10
16 r9
20 r8
24 r7
28 r6
32 r5
36 r4
40 r2 : windowing block type
44 ct00 high
48 ct00 low
52 ct01 high
56 ct01 low
60 ct04 high
64 ct04 low
68 ct06 high
72 ct06 low
76 ct05 high
80 ct05 low
84 ct03 high
88 ct03 low
92 -ct05 high
96 -ct05 low
100 -ct07 high
104 -ct07 low
108 ct07 high
112 ct07 low
116 ct02 high
120 ct02 low
*/
#define BLOCK_MODE_NORMAL 0
#define BLOCK_MODE_START 1
#define BLOCK_MODE_STOP 3
#define X0 0x00
#define X1 0x04
#define X2 0x08
#define X3 0x0C
#define X4 0x10
#define X5 0x14
#define X6 0x18
#define X7 0x1c
#define X8 0x20
#define X9 0x24
#define X10 0x28
#define X11 0x2c
#define X12 0x30
#define X13 0x34
#define X14 0x38
#define X15 0x3c
#define X16 0x40
#define X17 0x44
#define x0 0x00
#define x1 0x04
#define x2 0x08
#define x3 0x0C
#define x4 0x10
#define x5 0x14
#define x6 0x18
#define x7 0x1c
#define x8 0x20
#define x9 0x24
#define x10 0x28
#define x11 0x2c
#define x12 0x30
#define x13 0x34
#define x14 0x38
#define x15 0x3c
#define x16 0x40
#define x17 0x44
#define x18 0x48
#define x19 0x4c
#define x20 0x50
#define x21 0x54
#define x22 0x58
#define x23 0x5c
#define x24 0x60
#define x25 0x64
#define x26 0x68
#define x27 0x6c
#define x28 0x70
#define x29 0x74
#define x30 0x78
#define x31 0x7c
#define x32 0x80
#define x33 0x84
#define x34 0x88
#define x35 0x8c
#define K00 0x0ffc19fd
#define K01 0x00b2aa3e
#define K02 0x0fdcf549
#define K03 0x0216a2a2
#define K04 0x0f9ee890
#define K05 0x03768962
#define K06 0x0f426cb5
#define K07 0x04cfb0e2
#define K08 0x0ec835e8
#define K09 0x061f78aa
#define K10 0x0e313245
#define K11 0x07635284
#define K12 0x0d7e8807
#define K13 0x0898c779
#define K14 0x0cb19346
#define K15 0x09bd7ca0
#define K16 0x0bcbe352
#define K17 0x0acf37ad
#define minus_K02 0xf0230ab7
#define WL0 0x00b2aa3e
#define WL1 0x0216a2a2
#define WL2 0x03768962
#define WL3 0x04cfb0e2
#define WL4 0x061f78aa
#define WL5 0x07635284
#define WL6 0x0898c779
#define WL7 0x09bd7ca0
#define WL8 0x0acf37ad
#define WL9 0x0bcbe352
#define WL10 0x0cb19346
#define WL11 0x0d7e8807
#define WL12 0x0e313245
#define WL13 0x0ec835e8
#define WL14 0x0f426cb5
#define WL15 0x0f9ee890
#define WL16 0x0fdcf549
#define WL17 0x0ffc19fd
@*****************************************************************************
.text
.align
.global III_imdct_l
.global _III_imdct_l
III_imdct_l:
_III_imdct_l:
stmdb sp!, { r2, r4 - r11, lr } @ all callee saved regs, plus arg3
ldr r4, =K08 @ r4 = K08
ldr r5, =K09 @ r5 = K09
ldr r8, [r0, #X4] @ r8 = X4
ldr r9, [r0, #X13] @ r9 = X13
rsb r6, r4, #0 @ r6 = -K08
rsb r7, r5, #0 @ r7 = -K09
smull r2, r3, r4, r8 @ r2..r3 = (X4 * K08)
smlal r2, r3, r5, r9 @ r2..r3 = (X4 * K08) + (X13 * K09) = ct01
smull r10, lr, r8, r5 @ r10..lr = (X4 * K09)
smlal r10, lr, r9, r6 @ r10..lr = (X4 * K09) + (X13 * -K08) = ct00
ldr r8, [r0, #X7] @ r8 = X7
ldr r9, [r0, #X16] @ r9 = X16
stmdb sp!, { r2, r3, r10, lr } @ stack ct00_h, ct00_l, ct01_h, ct01_l
add r8, r8, r9 @ r8 = (X7 + X16)
ldr r9, [r0, #X1] @ r9 = X1
smlal r2, r3, r6, r8 @ r2..r3 = ct01 + ((X7 + X16) * -K08)
smlal r2, r3, r7, r9 @ r2..r3 += (X1 * -K09)
ldr r7, [r0, #X10] @ r7 = X10
rsbs r10, r10, #0
rsc lr, lr, #0 @ r10..lr = -ct00
smlal r2, r3, r5, r7 @ r2..r3 += (X10 * K09) = ct06
smlal r10, lr, r9, r6 @ r10..lr = -ct00 + ( X1 * -K08)
smlal r10, lr, r8, r5 @ r10..lr += ((X7 + X16) * K09)
smlal r10, lr, r7, r4 @ r10..lr += ( X10 * K08) = ct04
stmdb sp!, { r2, r3, r10, lr } @ stack ct04_h, ct04_l, ct06_h, ct06_l
@----
ldr r7, [r0, #X0]
ldr r8, [r0, #X11]
ldr r9, [r0, #X12]
sub r7, r7, r8
sub r7, r7, r9 @ r7 = (X0 - X11 -X12) = ct14
ldr r9, [r0, #X3]
ldr r8, [r0, #X8]
ldr r11, [r0, #X15]
sub r8, r8, r9
add r8, r8, r11 @ r8 = (X8 - X3 + X15) = ct16
add r11, r7, r8 @ r11 = ct14 + ct16 = ct18
smlal r2, r3, r6, r11 @ r2..r3 = ct06 + ((X0 - X11 - X3 + X15 + X8 - X12) * -K08)
ldr r6, [r0, #X2]
ldr r9, [r0, #X9]
ldr r12, [r0, #X14]
sub r6, r6, r9
sub r6, r6, r12 @ r6 = (X2 - X9 - X14) = ct15
ldr r9, [r0, #X5]
ldr r12, [r0, #X6]
sub r9, r9, r12
ldr r12, [r0, #X17]
sub r9, r9, r12 @ r9 = (X5 - X6 - X17) = ct17
add r12, r9, r6 @ r12 = ct15 + ct17 = ct19
smlal r2, r3, r5, r12 @ r2..r3 += ((X2 - X9 + X5 - X6 - X17 - X14) * K09)
smlal r10, lr, r11, r5 @ r10..lr = ct04 + (ct18 * K09)
smlal r10, lr, r12, r4 @ r10..lr = ct04 + (ct18 * K09) + (ct19 * K08)
movs r2, r2, lsr #28
adc r2, r2, r3, lsl #4 @ r2 = bits[59..28] of r2..r3
str r2, [r1, #x22] @ store result x22
movs r10, r10, lsr #28
adc r10, r10, lr, lsl #4 @ r10 = bits[59..28] of r10..lr
str r10, [r1, #x4] @ store result x4
@----
ldmia sp, { r2, r3, r4, r5 } @ r2..r3 = ct06, r4..r5 = ct04 (dont update sp)
@ r2..r3 = ct06
@ r4..r5 = ct04
@ r6 = ct15
@ r7 = ct14
@ r8 = ct16
@ r9 = ct17
@ r10 = .
@ r11 = .
@ r12 = .
@ lr = .
ldr r10, =K03 @ r10 = K03
ldr lr, =K15 @ lr = K15
smlal r2, r3, r10, r7 @ r2..r3 = ct06 + (ct14 * K03)
smlal r4, r5, lr, r7 @ r4..r5 = ct04 + (ct14 * K15)
ldr r12, =K14 @ r12 = K14
rsb r10, r10, #0 @ r10 = -K03
smlal r2, r3, lr, r6 @ r2..r3 += (ct15 * K15)
smlal r4, r5, r10, r6 @ r4..r5 += (ct15 * -K03)
smlal r2, r3, r12, r8 @ r2..r3 += (ct16 * K14)
ldr r11, =minus_K02 @ r11 = -K02
rsb r12, r12, #0 @ r12 = -K14
smlal r4, r5, r12, r9 @ r4..r5 += (ct17 * -K14)
smlal r2, r3, r11, r9 @ r2..r3 += (ct17 * -K02)
smlal r4, r5, r11, r8 @ r4..r5 += (ct16 * -K02)
movs r2, r2, lsr #28
adc r2, r2, r3, lsl #4 @ r2 = bits[59..28] of r2..r3
str r2, [r1, #x7] @ store result x7
movs r4, r4, lsr #28
adc r4, r4, r5, lsl #4 @ r4 = bits[59..28] of r4..r5
str r4, [r1, #x1] @ store result x1
@----
ldmia sp, { r2, r3, r4, r5 } @ r2..r3 = ct06, r4..r5 = ct04 (dont update sp)
@ r2..r3 = ct06
@ r4..r5 = ct04
@ r6 = ct15
@ r7 = ct14
@ r8 = ct16
@ r9 = ct17
@ r10 = -K03
@ r11 = -K02
@ r12 = -K14
@ lr = K15
rsbs r2, r2, #0
rsc r3, r3, #0 @ r2..r3 = -ct06
smlal r2, r3, r12, r7 @ r2..r3 = -ct06 + (ct14 * -K14)
smlal r2, r3, r10, r8 @ r2..r3 += (ct16 * -K03)
smlal r4, r5, r12, r6 @ r4..r5 = ct04 + (ct15 * -K14)
smlal r4, r5, r10, r9 @ r4..r5 += (ct17 * -K03)
smlal r4, r5, lr, r8 @ r4..r5 += (ct16 * K15)
smlal r4, r5, r11, r7 @ r4..r5 += (ct14 * -K02)
rsb lr, lr, #0 @ lr = -K15
rsb r11, r11, #0 @ r11 = K02
smlal r2, r3, lr, r9 @ r2..r3 += (ct17 * -K15)
smlal r2, r3, r11, r6 @ r2..r3 += (ct15 * K02)
movs r4, r4, lsr #28
adc r4, r4, r5, lsl #4 @ r4 = bits[59..28] of r4..r5
str r4, [r1, #x25] @ store result x25
movs r2, r2, lsr #28
adc r2, r2, r3, lsl #4 @ r2 = bits[59..28] of r2..r3
str r2, [r1, #x19] @ store result x19
@----
ldr r2, [sp, #16] @ r2 = ct01_l
ldr r3, [sp, #20] @ r3 = ct01_h
ldr r6, [r0, #X1]
ldr r8, [r0, #X7]
ldr r9, [r0, #X10]
ldr r7, [r0, #X16]
rsbs r2, r2, #0
rsc r3, r3, #0 @ r2..r3 = -ct01
mov r4, r2
mov r5, r3 @ r4..r5 = -ct01
@ r2..r3 = -ct01
@ r4..r5 = -ct01
@ r6 = X1
@ r7 = X16
@ r8 = X7
@ r9 = X10
@ r10 = -K03
@ r11 = K02
@ r12 = -K14
@ lr = -K15
smlal r4, r5, r12, r7 @ r4..r5 = -ct01 + (X16 * -K14)
smlal r2, r3, lr, r9 @ r2..r3 = -ct01 + (X10 * -K15)
smlal r4, r5, r10, r8 @ r4..r5 += (X7 * -K03)
smlal r2, r3, r10, r7 @ r2..r3 += (X16 * -K03)
smlal r4, r5, r11, r9 @ r4..r5 += (X10 * K02)
smlal r2, r3, r12, r8 @ r2..r3 += (X7 * -K14)
rsb lr, lr, #0 @ lr = K15
rsb r11, r11, #0 @ r11 = -K02
smlal r4, r5, lr, r6 @ r4..r5 += (X1 * K15) = ct05
smlal r2, r3, r11, r6 @ r2..r3 += (X1 * -K02) = ct03
stmdb sp!, { r2, r3, r4, r5 } @ stack ct05_h, ct05_l, ct03_h, ct03_l
rsbs r4, r4, #0
rsc r5, r5, #0 @ r4..r5 = -ct05
stmdb sp!, { r4, r5 } @ stack -ct05_h, -ct05_l
ldr r2, [sp, #48] @ r2 = ct00_l
ldr r3, [sp, #52] @ r3 = ct00_h
rsb r10, r10, #0 @ r10 = K03
rsbs r4, r2, #0
rsc r5, r3, #0 @ r4..r5 = -ct00
@ r2..r3 = ct00
@ r4..r5 = -ct00
@ r6 = X1
@ r7 = X16
@ r8 = X7
@ r9 = X10
@ r10 = K03
@ r11 = -K02
@ r12 = -K14
@ lr = K15
smlal r4, r5, r10, r6 @ r4..r5 = -ct00 + (X1 * K03)
smlal r2, r3, r10, r9 @ r2..r3 = ct00 + (X10 * K03)
smlal r4, r5, r12, r9 @ r4..r5 += (X10 * -K14)
smlal r2, r3, r12, r6 @ r2..r3 += (X1 * -K14)
smlal r4, r5, r11, r7 @ r4..r5 += (X16 * -K02)
smlal r4, r5, lr, r8 @ r4..r5 += (X7 * K15) = ct07
rsb lr, lr, #0 @ lr = -K15
rsb r11, r11, #0 @ r11 = K02
smlal r2, r3, r11, r8 @ r2..r3 += (X7 * K02)
smlal r2, r3, lr, r7 @ r2..r3 += (X16 * -K15) = ct02
rsbs r6, r4, #0
rsc r7, r5, #0 @ r6..r7 = -ct07
stmdb sp!, { r2 - r7 } @ stack -ct07_h, -ct07_l, ct07_h, ct07_l, ct02_h, ct02_l
@----
add r2, pc, #(imdct36_long_karray-.-8) @ r2 = base address of Knn array (PIC safe ?)
loop:
ldr r12, [r0, #X0]
ldmia r2!, { r5 - r11 } @ first 7 words from Karray element
smull r3, r4, r5, r12 @ sum = (Kxx * X0)
ldr r12, [r0, #X2]
ldr r5, [r0, #X3]
smlal r3, r4, r6, r12 @ sum += (Kxx * X2)
ldr r12, [r0, #X5]
ldr r6, [r0, #X6]
smlal r3, r4, r7, r5 @ sum += (Kxx * X3)
smlal r3, r4, r8, r12 @ sum += (Kxx * X5)
ldr r12, [r0, #X8]
ldr r5, [r0, #X9]
smlal r3, r4, r9, r6 @ sum += (Kxx * X6)
smlal r3, r4, r10, r12 @ sum += (Kxx * X8)
smlal r3, r4, r11, r5 @ sum += (Kxx * X9)
ldmia r2!, { r5 - r10 } @ final 6 words from Karray element
ldr r11, [r0, #X11]
ldr r12, [r0, #X12]
smlal r3, r4, r5, r11 @ sum += (Kxx * X11)
ldr r11, [r0, #X14]
ldr r5, [r0, #X15]
smlal r3, r4, r6, r12 @ sum += (Kxx * X12)
smlal r3, r4, r7, r11 @ sum += (Kxx * X14)
ldr r11, [r0, #X17]
smlal r3, r4, r8, r5 @ sum += (Kxx * X15)
smlal r3, r4, r9, r11 @ sum += (Kxx * X17)
add r5, sp, r10, lsr #16 @ create index back into stack for required ctxx
ldmia r5, { r6, r7 } @ r6..r7 = ctxx
mov r8, r10, lsl #16 @ push ctxx index off the top end
adds r3, r3, r6 @ add low words
adc r4, r4, r7 @ add high words, with carry
movs r3, r3, lsr #28
adc r3, r3, r4, lsl #4 @ r3 = bits[59..28] of r3..r4
str r3, [r1, r8, lsr #24] @ push completion flag off the bottom end
movs r8, r8, lsl #8 @ push result location index off the top end
beq loop @ loop back if completion flag not set
b imdct_l_windowing @ branch to windowing stage if looping finished
imdct36_long_karray:
.word K17, -K13, K10, -K06, -K05, K01, -K00, K04, -K07, K11, K12, -K16, 0x00000000
.word K13, K07, K16, K01, K10, -K05, K04, -K11, K00, -K17, K06, -K12, 0x00200800
.word K11, K17, K05, K12, -K01, K06, -K07, K00, -K13, K04, -K16, K10, 0x00200c00
.word K07, K00, -K12, K05, -K16, -K10, K11, -K17, K04, K13, K01, K06, 0x00001400
.word K05, K10, -K00, -K17, K07, -K13, K12, K06, -K16, K01, -K11, -K04, 0x00181800
.word K01, K05, -K07, -K11, K13, K17, -K16, -K12, K10, K06, -K04, -K00, 0x00102000
.word -K16, K12, -K11, K07, K04, -K00, -K01, K05, -K06, K10, K13, -K17, 0x00284800
.word -K12, K06, K17, -K00, -K11, K04, K05, -K10, K01, K16, -K07, -K13, 0x00085000
.word -K10, K16, K04, -K13, -K00, K07, K06, -K01, -K12, -K05, K17, K11, 0x00105400
.word -K06, -K01, K13, K04, K17, -K11, -K10, -K16, -K05, K12, K00, K07, 0x00185c00
.word -K04, -K11, -K01, K16, K06, K12, K13, -K07, -K17, -K00, -K10, -K05, 0x00006000
.word -K00, -K04, -K06, -K10, -K12, -K16, -K17, -K13, -K11, -K07, -K05, -K01, 0x00206801
@----
@-------------------------------------------------------------------------
@----
imdct_l_windowing:
ldr r11, [sp, #80] @ fetch function parameter 3 from out of the stack
ldmia r1!, { r0, r2 - r9 } @ load 9 words from x0, update pointer
@ r0 = x0
@ r1 = &x[9]
@ r2 = x1
@ r3 = x2
@ r4 = x3
@ r5 = x4
@ r6 = x5
@ r7 = x6
@ r8 = x7
@ r9 = x8
@ r10 = .
@ r11 = window mode: (0 == normal), (1 == start block), (3 == stop block)
@ r12 = .
@ lr = .
cmp r11, #BLOCK_MODE_STOP @ setup flags
rsb r10, r0, #0 @ r10 = -x0 (DONT change flags !!)
beq stop_block_x0_to_x17
@ start and normal blocks are treated the same for x[0]..x[17]
normal_block_x0_to_x17:
ldr r12, =WL9 @ r12 = window_l[9]
rsb r0, r9, #0 @ r0 = -x8
rsb r9, r2, #0 @ r9 = -x1
rsb r2, r8, #0 @ r2 = -x7
rsb r8, r3, #0 @ r8 = -x2
rsb r3, r7, #0 @ r3 = -x6
rsb r7, r4, #0 @ r7 = -x3
rsb r4, r6, #0 @ r4 = -x5
rsb r6, r5, #0 @ r6 = -x4
@ r0 = -x8
@ r1 = &x[9]
@ r2 = -x7
@ r3 = -x6
@ r4 = -x5
@ r5 = .
@ r6 = -x4
@ r7 = -x3
@ r8 = -x2
@ r9 = -x1
@ r10 = -x0
@ r11 = window mode: (0 == normal), (1 == start block), (3 == stop block)
@ r12 = window_l[9]
@ lr = .
smull r5, lr, r12, r0 @ r5..lr = (window_l[9] * (x[9] == -x[8]))
ldr r12, =WL10 @ r12 = window_l[10]
movs r5, r5, lsr #28
adc r0, r5, lr, lsl #4 @ r0 = bits[59..28] of windowed x9
smull r5, lr, r12, r2 @ r5..lr = (window_l[10] * (x[10] == -x[7]))
ldr r12, =WL11 @ r12 = window_l[11]
movs r5, r5, lsr #28
adc r2, r5, lr, lsl #4 @ r2 = bits[59..28] of windowed x10
smull r5, lr, r12, r3 @ r5..lr = (window_l[11] * (x[11] == -x[6]))
ldr r12, =WL12 @ r12 = window_l[12]
movs r5, r5, lsr #28
adc r3, r5, lr, lsl #4 @ r3 = bits[59..28] of windowed x11
smull r5, lr, r12, r4 @ r5..lr = (window_l[12] * (x[12] == -x[5]))
ldr r12, =WL13 @ r12 = window_l[13]
movs r5, r5, lsr #28
adc r4, r5, lr, lsl #4 @ r4 = bits[59..28] of windowed x12
smull r5, lr, r12, r6 @ r5..lr = (window_l[13] * (x[13] == -x[4]))
ldr r12, =WL14 @ r12 = window_l[14]
movs r5, r5, lsr #28
adc r6, r5, lr, lsl #4 @ r6 = bits[59..28] of windowed x13
smull r5, lr, r12, r7 @ r5..lr = (window_l[14] * (x[14] == -x[3]))
ldr r12, =WL15 @ r12 = window_l[15]
movs r5, r5, lsr #28
adc r7, r5, lr, lsl #4 @ r7 = bits[59..28] of windowed x14
smull r5, lr, r12, r8 @ r5..lr = (window_l[15] * (x[15] == -x[2]))
ldr r12, =WL16 @ r12 = window_l[16]
movs r5, r5, lsr #28
adc r8, r5, lr, lsl #4 @ r8 = bits[59..28] of windowed x15
smull r5, lr, r12, r9 @ r5..lr = (window_l[16] * (x[16] == -x[1]))
ldr r12, =WL17 @ r12 = window_l[17]
movs r5, r5, lsr #28
adc r9, r5, lr, lsl #4 @ r9 = bits[59..28] of windowed x16
smull r5, lr, r12, r10 @ r5..lr = (window_l[17] * (x[17] == -x[0]))
ldr r12, =WL0 @ r12 = window_l[0]
movs r5, r5, lsr #28
adc r10, r5, lr, lsl #4 @ r10 = bits[59..28] of windowed x17
stmia r1, { r0, r2 - r4, r6 - r10 } @ store windowed x[9] .. x[17]
ldmdb r1!, { r0, r2 - r9 } @ load 9 words downto (and including) x0
smull r10, lr, r12, r0 @ r10..lr = (window_l[0] * x[0])
ldr r12, =WL1 @ r12 = window_l[1]
movs r10, r10, lsr #28
adc r0, r10, lr, lsl #4 @ r0 = bits[59..28] of windowed x0
smull r10, lr, r12, r2 @ r10..lr = (window_l[1] * x[1])
ldr r12, =WL2 @ r12 = window_l[2]
movs r10, r10, lsr #28
adc r2, r10, lr, lsl #4 @ r2 = bits[59..28] of windowed x1
smull r10, lr, r12, r3 @ r10..lr = (window_l[2] * x[2])
ldr r12, =WL3 @ r12 = window_l[3]
movs r10, r10, lsr #28
adc r3, r10, lr, lsl #4 @ r3 = bits[59..28] of windowed x2
smull r10, lr, r12, r4 @ r10..lr = (window_l[3] * x[3])
ldr r12, =WL4 @ r12 = window_l[4]
movs r10, r10, lsr #28
adc r4, r10, lr, lsl #4 @ r4 = bits[59..28] of windowed x3
smull r10, lr, r12, r5 @ r10..lr = (window_l[4] * x[4])
ldr r12, =WL5 @ r12 = window_l[5]
movs r10, r10, lsr #28
adc r5, r10, lr, lsl #4 @ r5 = bits[59..28] of windowed x4
smull r10, lr, r12, r6 @ r10..lr = (window_l[5] * x[5])
ldr r12, =WL6 @ r12 = window_l[6]
movs r10, r10, lsr #28
adc r6, r10, lr, lsl #4 @ r6 = bits[59..28] of windowed x5
smull r10, lr, r12, r7 @ r10..lr = (window_l[6] * x[6])
ldr r12, =WL7 @ r12 = window_l[7]
movs r10, r10, lsr #28
adc r7, r10, lr, lsl #4 @ r7 = bits[59..28] of windowed x6
smull r10, lr, r12, r8 @ r10..lr = (window_l[7] * x[7])
ldr r12, =WL8 @ r12 = window_l[8]
movs r10, r10, lsr #28
adc r8, r10, lr, lsl #4 @ r8 = bits[59..28] of windowed x7
smull r10, lr, r12, r9 @ r10..lr = (window_l[8] * x[8])
movs r10, r10, lsr #28
adc r9, r10, lr, lsl #4 @ r9 = bits[59..28] of windowed x8
stmia r1, { r0, r2 - r9 } @ store windowed x[0] .. x[8]
cmp r11, #BLOCK_MODE_START
beq start_block_x18_to_x35
@----
normal_block_x18_to_x35:
ldr r11, =WL3 @ r11 = window_l[3]
ldr r12, =WL4 @ r12 = window_l[4]
add r1, r1, #(18*4) @ r1 = &x[18]
ldmia r1!, { r0, r2 - r4, r6 - r10 } @ load 9 words from x18, update pointer
@ r0 = x18
@ r1 = &x[27]
@ r2 = x19
@ r3 = x20
@ r4 = x21
@ r5 = .
@ r6 = x22
@ r7 = x23
@ r8 = x24
@ r9 = x25
@ r10 = x26
@ r11 = window_l[3]
@ r12 = window_l[4]
@ lr = .
smull r5, lr, r12, r6 @ r5..lr = (window_l[4] * (x[22] == x[31]))
movs r5, r5, lsr #28
adc r5, r5, lr, lsl #4 @ r5 = bits[59..28] of windowed x31
smull r6, lr, r11, r4 @ r5..lr = (window_l[3] * (x[21] == x[32]))
ldr r12, =WL5 @ r12 = window_l[5]
movs r6, r6, lsr #28
adc r6, r6, lr, lsl #4 @ r6 = bits[59..28] of windowed x32
smull r4, lr, r12, r7 @ r4..lr = (window_l[5] * (x[23] == x[30]))
ldr r11, =WL1 @ r11 = window_l[1]
ldr r12, =WL2 @ r12 = window_l[2]
movs r4, r4, lsr #28
adc r4, r4, lr, lsl #4 @ r4 = bits[59..28] of windowed x30
smull r7, lr, r12, r3 @ r7..lr = (window_l[2] * (x[20] == x[33]))
ldr r12, =WL6 @ r12 = window_l[6]
movs r7, r7, lsr #28
adc r7, r7, lr, lsl #4 @ r7 = bits[59..28] of windowed x33
smull r3, lr, r12, r8 @ r3..lr = (window_l[6] * (x[24] == x[29]))
movs r3, r3, lsr #28
adc r3, r3, lr, lsl #4 @ r3 = bits[59..28] of windowed x29
smull r8, lr, r11, r2 @ r7..lr = (window_l[1] * (x[19] == x[34]))
ldr r12, =WL7 @ r12 = window_l[7]
ldr r11, =WL8 @ r11 = window_l[8]
movs r8, r8, lsr #28
adc r8, r8, lr, lsl #4 @ r8 = bits[59..28] of windowed x34
smull r2, lr, r12, r9 @ r7..lr = (window_l[7] * (x[25] == x[28]))
ldr r12, =WL0 @ r12 = window_l[0]
movs r2, r2, lsr #28
adc r2, r2, lr, lsl #4 @ r2 = bits[59..28] of windowed x28
smull r9, lr, r12, r0 @ r3..lr = (window_l[0] * (x[18] == x[35]))
movs r9, r9, lsr #28
adc r9, r9, lr, lsl #4 @ r9 = bits[59..28] of windowed x35
smull r0, lr, r11, r10 @ r7..lr = (window_l[8] * (x[26] == x[27]))
ldr r11, =WL16 @ r11 = window_l[16]
ldr r12, =WL17 @ r12 = window_l[17]
movs r0, r0, lsr #28
adc r0, r0, lr, lsl #4 @ r0 = bits[59..28] of windowed x27
stmia r1, { r0, r2 - r9 } @ store windowed x[27] .. x[35]
ldmdb r1!, { r0, r2 - r9 } @ load 9 words downto (and including) x18
smull r10, lr, r12, r0 @ r10..lr = (window_l[17] * x[18])
movs r10, r10, lsr #28
adc r0, r10, lr, lsl #4 @ r0 = bits[59..28] of windowed x0
smull r10, lr, r11, r2 @ r10..lr = (window_l[16] * x[19])
ldr r11, =WL14 @ r11 = window_l[14]
ldr r12, =WL15 @ r12 = window_l[15]
movs r10, r10, lsr #28
adc r2, r10, lr, lsl #4 @ r2 = bits[59..28] of windowed x1
smull r10, lr, r12, r3 @ r10..lr = (window_l[15] * x[20])
movs r10, r10, lsr #28
adc r3, r10, lr, lsl #4 @ r3 = bits[59..28] of windowed x2
smull r10, lr, r11, r4 @ r10..lr = (window_l[14] * x[21])
ldr r11, =WL12 @ r11 = window_l[12]
ldr r12, =WL13 @ r12 = window_l[13]
movs r10, r10, lsr #28
adc r4, r10, lr, lsl #4 @ r4 = bits[59..28] of windowed x3
smull r10, lr, r12, r5 @ r10..lr = (window_l[13] * x[22])
movs r10, r10, lsr #28
adc r5, r10, lr, lsl #4 @ r5 = bits[59..28] of windowed x4
smull r10, lr, r11, r6 @ r10..lr = (window_l[12] * x[23])
ldr r11, =WL10 @ r12 = window_l[10]
ldr r12, =WL11 @ r12 = window_l[11]
movs r10, r10, lsr #28
adc r6, r10, lr, lsl #4 @ r6 = bits[59..28] of windowed x5
smull r10, lr, r12, r7 @ r10..lr = (window_l[11] * x[24])
movs r10, r10, lsr #28
adc r7, r10, lr, lsl #4 @ r7 = bits[59..28] of windowed x6
smull r10, lr, r11, r8 @ r10..lr = (window_l[10] * x[25])
ldr r12, =WL9 @ r12 = window_l[9]
movs r10, r10, lsr #28
adc r8, r10, lr, lsl #4 @ r8 = bits[59..28] of windowed x7
smull r10, lr, r12, r9 @ r10..lr = (window_l[9] * x[26])
movs r10, r10, lsr #28
adc r9, r10, lr, lsl #4 @ r9 = bits[59..28] of windowed x8
stmia r1, { r0, r2 - r9 } @ store windowed x[18] .. x[26]
@----
@ NB there are 2 possible exits from this function - this is only one of them
@----
add sp, sp, #(21*4) @ return stack frame
ldmia sp!, { r4 - r11, pc } @ restore callee saved regs, and return
@----
stop_block_x0_to_x17:
@ r0 = x0
@ r1 = &x[9]
@ r2 = x1
@ r3 = x2
@ r4 = x3
@ r5 = x4
@ r6 = x5
@ r7 = x6
@ r8 = x7
@ r9 = x8
@ r10 = -x0
@ r11 = window mode: (0 == normal), (1 == start block), (3 == stop block)
@ r12 = .
@ lr = .
rsb r0, r6, #0 @ r0 = -x5
rsb r6, r2, #0 @ r6 = -x1
rsb r2, r5, #0 @ r2 = -x4
rsb r5, r3, #0 @ r5 = -x2
rsb r3, r4, #0 @ r3 = -x3
add r1, r1, #(3*4) @ r1 = &x[12]
stmia r1, { r0, r2, r3, r5, r6, r10 } @ store unchanged x[12] .. x[17]
ldr r0, =WL1 @ r0 = window_l[1] == window_s[0]
rsb r10, r9, #0 @ r10 = -x8
rsb r12, r8, #0 @ r12 = -x7
rsb lr, r7, #0 @ lr = -x6
@ r0 = WL1
@ r1 = &x[12]
@ r2 = .
@ r3 = .
@ r4 = .
@ r5 = .
@ r6 = .
@ r7 = x6
@ r8 = x7
@ r9 = x8
@ r10 = -x8
@ r11 = window mode: (0 == normal), (1 == start block), (3 == stop block)
@ r12 = -x7
@ lr = -x6
smull r5, r6, r0, r7 @ r5..r6 = (window_l[1] * x[6])
ldr r2, =WL4 @ r2 = window_l[4] == window_s[1]
movs r5, r5, lsr #28
adc r7, r5, r6, lsl #4 @ r7 = bits[59..28] of windowed x6
smull r5, r6, r2, r8 @ r5..r6 = (window_l[4] * x[7])
ldr r3, =WL7 @ r3 = window_l[7] == window_s[2]
movs r5, r5, lsr #28
adc r8, r5, r6, lsl #4 @ r8 = bits[59..28] of windowed x7
smull r5, r6, r3, r9 @ r5..r6 = (window_l[7] * x[8])
ldr r4, =WL10 @ r4 = window_l[10] == window_s[3]
movs r5, r5, lsr #28
adc r9, r5, r6, lsl #4 @ r9 = bits[59..28] of windowed x8
smull r5, r6, r4, r10 @ r5..r6 = (window_l[10] * (x[9] == -x[8]))
ldr r0, =WL13 @ r0 = window_l[13] == window_s[4]
movs r5, r5, lsr #28
adc r10, r5, r6, lsl #4 @ r10 = bits[59..28] of windowed x9
smull r5, r6, r0, r12 @ r5..r6 = (window_l[13] * (x[10] == -x[7]))
ldr r2, =WL16 @ r2 = window_l[16] == window_s[5]
movs r5, r5, lsr #28
adc r12, r5, r6, lsl #4 @ r10 = bits[59..28] of windowed x9
smull r5, r6, r2, lr @ r5..r6 = (window_l[16] * (x[11] == -x[6]))
ldr r0, =0x00
movs r5, r5, lsr #28
adc lr, r5, r6, lsl #4 @ r10 = bits[59..28] of windowed x9
stmdb r1!, { r7 - r10, r12, lr } @ store windowed x[6] .. x[11]
ldr r5, =0x00
ldr r6, =0x00
ldr r2, =0x00
ldr r3, =0x00
ldr r4, =0x00
stmdb r1!, { r0, r2 - r6 } @ store windowed x[0] .. x[5]
b normal_block_x18_to_x35
@----
start_block_x18_to_x35:
ldr r4, =WL1 @ r0 = window_l[1] == window_s[0]
add r1, r1, #(24*4) @ r1 = &x[24]
ldmia r1, { r0, r2, r3 } @ load 3 words from x24, dont update pointer
@ r0 = x24
@ r1 = &x[24]
@ r2 = x25
@ r3 = x26
@ r4 = WL1
@ r5 = WL4
@ r6 = WL7
@ r7 = WL10
@ r8 = WL13
@ r9 = WL16
@ r10 = .
@ r11 = .
@ r12 = .
@ lr = .
ldr r5, =WL4 @ r5 = window_l[4] == window_s[1]
smull r10, r11, r4, r0 @ r10..r11 = (window_l[1] * (x[24] == x[29]))
ldr r6, =WL7 @ r6 = window_l[7] == window_s[2]
movs r10, r10, lsr #28
adc lr, r10, r11, lsl #4 @ lr = bits[59..28] of windowed x29
smull r10, r11, r5, r2 @ r10..r11 = (window_l[4] * (x[25] == x[28]))
ldr r7, =WL10 @ r7 = window_l[10] == window_s[3]
movs r10, r10, lsr #28
adc r12, r10, r11, lsl #4 @ r12 = bits[59..28] of windowed x28
smull r10, r11, r6, r3 @ r10..r11 = (window_l[7] * (x[26] == x[27]))
ldr r8, =WL13 @ r8 = window_l[13] == window_s[4]
movs r10, r10, lsr #28
adc r4, r10, r11, lsl #4 @ r4 = bits[59..28] of windowed x27
smull r10, r11, r7, r3 @ r10..r11 = (window_l[10] * x[26])
ldr r9, =WL16 @ r9 = window_l[16] == window_s[5]
movs r10, r10, lsr #28
adc r3, r10, r11, lsl #4 @ r3 = bits[59..28] of windowed x26
smull r10, r11, r8, r2 @ r10..r11 = (window_l[13] * x[25])
ldr r5, =0x00
movs r10, r10, lsr #28
adc r2, r10, r11, lsl #4 @ r2 = bits[59..28] of windowed x25
smull r10, r11, r9, r0 @ r10..r11 = (window_l[16] * x[24])
ldr r6, =0x00
movs r10, r10, lsr #28
adc r0, r10, r11, lsl #4 @ r0 = bits[59..28] of windowed x24
stmia r1!, { r0, r2, r3, r4, r12, lr } @ store windowed x[24] .. x[29]
ldr r7, =0x00
ldr r8, =0x00
ldr r9, =0x00
ldr r10, =0x00
stmia r1!, { r5 - r10 } @ store windowed x[30] .. x[35]
@----
@ NB there are 2 possible exits from this function - this is only one of them
@----
add sp, sp, #(21*4) @ return stack frame
ldmia sp!, { r4 - r11, pc } @ restore callee saved regs, and return
@----
@END
@----
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