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Diffstat (limited to 'imdct_l_arm.S')
| -rw-r--r-- | imdct_l_arm.S | 1000 |
1 files changed, 1000 insertions, 0 deletions
diff --git a/imdct_l_arm.S b/imdct_l_arm.S new file mode 100644 index 0000000..badec5b --- /dev/null +++ b/imdct_l_arm.S @@ -0,0 +1,1000 @@ +/***************************************************************************** +* 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 1.7 2001/03/25 20:03:34 rob Rel $ +* +* 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 + @---- + |