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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: imdct_l_arm.S,v 1.1 2003/08/14 03:57:13 shank Exp $
+*
+* 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
+ @----
+