nest-open-source / nest-cam / 4320010 / tremolo / refs/heads/master / . / tremolo / Tremolo / mdctARM.s

@ Tremolo library | |

@----------------------------------------------------------------------- | |

@ Copyright (C) 2002-2009, Xiph.org Foundation | |

@ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd | |

@ All rights reserved. | |

@ Redistribution and use in source and binary forms, with or without | |

@ modification, are permitted provided that the following conditions | |

@ are met: | |

@ * Redistributions of source code must retain the above copyright | |

@ notice, this list of conditions and the following disclaimer. | |

@ * Redistributions in binary form must reproduce the above | |

@ copyright notice, this list of conditions and the following disclaimer | |

@ in the documentation and/or other materials provided with the | |

@ distribution. | |

@ * Neither the names of the Xiph.org Foundation nor Pinknoise | |

@ Productions Ltd nor the names of its contributors may be used to | |

@ endorse or promote products derived from this software without | |

@ specific prior written permission. | |

@ | |

@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |

@ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |

@ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |

@ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |

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@ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |

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@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |

@ ---------------------------------------------------------------------- | |

.text | |

@ full accuracy version | |

.global mdct_backwardARM | |

.global mdct_shift_right | |

.global mdct_unroll_prelap | |

.global mdct_unroll_part2 | |

.global mdct_unroll_part3 | |

.global mdct_unroll_postlap | |

.extern sincos_lookup0 | |

.extern sincos_lookup1 | |

.hidden sincos_lookup0 | |

.hidden sincos_lookup1 | |

mdct_unroll_prelap: | |

@ r0 = out | |

@ r1 = post | |

@ r2 = r | |

@ r3 = step | |

STMFD r13!,{r4-r7,r14} | |

MVN r4, #0x8000 | |

MOV r3, r3, LSL #1 | |

SUB r1, r2, r1 @ r1 = r - post | |

SUBS r1, r1, #16 @ r1 = r - post - 16 | |

BLT unroll_over | |

unroll_loop: | |

LDMDB r2!,{r5,r6,r7,r12} | |

MOV r5, r5, ASR #9 @ r5 = (*--r)>>9 | |

MOV r6, r6, ASR #9 @ r6 = (*--r)>>9 | |

MOV r7, r7, ASR #9 @ r7 = (*--r)>>9 | |

MOV r12,r12,ASR #9 @ r12= (*--r)>>9 | |

MOV r14,r12,ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r12,r4, r14,ASR #31 | |

STRH r12,[r0], r3 | |

MOV r14,r7, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r7, r4, r14,ASR #31 | |

STRH r7, [r0], r3 | |

MOV r14,r6, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r6, r4, r14,ASR #31 | |

STRH r6, [r0], r3 | |

MOV r14,r5, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r5, r4, r14,ASR #31 | |

STRH r5, [r0], r3 | |

SUBS r1, r1, #16 | |

BGE unroll_loop | |

unroll_over: | |

ADDS r1, r1, #16 | |

BLE unroll_end | |

unroll_loop2: | |

LDR r5,[r2,#-4]! | |

@ stall | |

@ stall (Xscale) | |

MOV r5, r5, ASR #9 @ r5 = (*--r)>>9 | |

MOV r14,r5, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r5, r4, r14,ASR #31 | |

STRH r5, [r0], r3 | |

SUBS r1, r1, #4 | |

BGT unroll_loop2 | |

unroll_end: | |

LDMFD r13!,{r4-r7,PC} | |

mdct_unroll_postlap: | |

@ r0 = out | |

@ r1 = post | |

@ r2 = l | |

@ r3 = step | |

STMFD r13!,{r4-r7,r14} | |

MVN r4, #0x8000 | |

MOV r3, r3, LSL #1 | |

SUB r1, r1, r2 @ r1 = post - l | |

MOV r1, r1, ASR #1 @ r1 = (post - l)>>1 | |

SUBS r1, r1, #16 @ r1 = ((post - l)>>1) - 4 | |

BLT unroll_over3 | |

unroll_loop3: | |

LDR r12,[r2],#8 | |

LDR r7, [r2],#8 | |

LDR r6, [r2],#8 | |

LDR r5, [r2],#8 | |

RSB r12,r12,#0 | |

RSB r5, r5, #0 | |

RSB r6, r6, #0 | |

RSB r7, r7, #0 | |

MOV r12, r12,ASR #9 @ r12= (-*l)>>9 | |

MOV r5, r5, ASR #9 @ r5 = (-*l)>>9 | |

MOV r6, r6, ASR #9 @ r6 = (-*l)>>9 | |

MOV r7, r7, ASR #9 @ r7 = (-*l)>>9 | |

MOV r14,r12,ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r12,r4, r14,ASR #31 | |

STRH r12,[r0], r3 | |

MOV r14,r7, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r7, r4, r14,ASR #31 | |

STRH r7, [r0], r3 | |

MOV r14,r6, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r6, r4, r14,ASR #31 | |

STRH r6, [r0], r3 | |

MOV r14,r5, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r5, r4, r14,ASR #31 | |

STRH r5, [r0], r3 | |

SUBS r1, r1, #16 | |

BGE unroll_loop3 | |

unroll_over3: | |

ADDS r1, r1, #16 | |

BLE unroll_over4 | |

unroll_loop4: | |

LDR r5,[r2], #8 | |

@ stall | |

@ stall (Xscale) | |

RSB r5, r5, #0 | |

MOV r5, r5, ASR #9 @ r5 = (-*l)>>9 | |

MOV r14,r5, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r5, r4, r14,ASR #31 | |

STRH r5, [r0], r3 | |

SUBS r1, r1, #4 | |

BGT unroll_loop4 | |

unroll_over4: | |

LDMFD r13!,{r4-r7,PC} | |

mdct_unroll_part2: | |

@ r0 = out | |

@ r1 = post | |

@ r2 = l | |

@ r3 = r | |

@ <> = step | |

@ <> = wL | |

@ <> = wR | |

MOV r12,r13 | |

STMFD r13!,{r4,r6-r11,r14} | |

LDMFD r12,{r8,r9,r10} @ r8 = step | |

@ r9 = wL | |

@ r10= wR | |

MVN r4, #0x8000 | |

MOV r8, r8, LSL #1 | |

SUBS r1, r3, r1 @ r1 = (r - post) | |

BLE unroll_over5 | |

unroll_loop5: | |

LDR r12,[r2, #-8]! @ r12= *l (but l -= 2 first) | |

LDR r11,[r9],#4 @ r11= *wL++ | |

LDR r7, [r3, #-4]! @ r7 = *--r | |

LDR r6, [r10,#-4]! @ r6 = *--wR | |

@ Can save a cycle here, at the cost of 1bit errors in rounding | |

SMULL r14,r11,r12,r11 @ (r14,r11) = *l * *wL++ | |

SMULL r14,r6, r7, r6 @ (r14,r6) = *--r * *--wR | |

ADD r6, r6, r11 | |

MOV r6, r6, ASR #8 | |

MOV r14,r6, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r6, r4, r14,ASR #31 | |

STRH r6, [r0], r8 | |

SUBS r1, r1, #4 | |

BGT unroll_loop5 | |

unroll_over5: | |

LDMFD r13!,{r4,r6-r11,PC} | |

mdct_unroll_part3: | |

@ r0 = out | |

@ r1 = post | |

@ r2 = l | |

@ r3 = r | |

@ <> = step | |

@ <> = wL | |

@ <> = wR | |

MOV r12,r13 | |

STMFD r13!,{r4,r6-r11,r14} | |

LDMFD r12,{r8,r9,r10} @ r8 = step | |

@ r9 = wL | |

@ r10= wR | |

MVN r4, #0x8000 | |

MOV r8, r8, LSL #1 | |

SUBS r1, r1, r3 @ r1 = (post - r) | |

BLE unroll_over6 | |

unroll_loop6: | |

LDR r12,[r2],#8 @ r12= *l (but l += 2 first) | |

LDR r11,[r9],#4 @ r11= *wL++ | |

LDR r7, [r3],#4 @ r7 = *r++ | |

LDR r6, [r10,#-4]! @ r6 = *--wR | |

@ Can save a cycle here, at the cost of 1bit errors in rounding | |

SMULL r14,r11,r12,r11 @ (r14,r11) = *l * *wL++ | |

SMULL r14,r6, r7, r6 @ (r14,r6) = *--r * *--wR | |

SUB r6, r6, r11 | |

MOV r6, r6, ASR #8 | |

MOV r14,r6, ASR #15 | |

TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range | |

EORNE r6, r4, r14,ASR #31 | |

STRH r6, [r0], r8 | |

SUBS r1, r1, #4 | |

BGT unroll_loop6 | |

unroll_over6: | |

LDMFD r13!,{r4,r6-r11,PC} | |

mdct_shift_right: | |

@ r0 = n | |

@ r1 = in | |

@ r2 = right | |

STMFD r13!,{r4-r11,r14} | |

MOV r0, r0, LSR #2 @ n >>= 2 | |

ADD r1, r1, #4 | |

SUBS r0, r0, #8 | |

BLT sr_less_than_8 | |

sr_loop: | |

LDR r3, [r1], #8 | |

LDR r4, [r1], #8 | |

LDR r5, [r1], #8 | |

LDR r6, [r1], #8 | |

LDR r7, [r1], #8 | |

LDR r8, [r1], #8 | |

LDR r12,[r1], #8 | |

LDR r14,[r1], #8 | |

SUBS r0, r0, #8 | |

STMIA r2!,{r3,r4,r5,r6,r7,r8,r12,r14} | |

BGE sr_loop | |

sr_less_than_8: | |

ADDS r0, r0, #8 | |

BEQ sr_end | |

sr_loop2: | |

LDR r3, [r1], #8 | |

SUBS r0, r0, #1 | |

STR r3, [r2], #4 | |

BGT sr_loop2 | |

sr_end: | |

LDMFD r13!,{r4-r11,PC} | |

mdct_backwardARM: | |

@ r0 = n | |

@ r1 = in | |

STMFD r13!,{r4-r11,r14} | |

MOV r2,#1<<4 @ r2 = 1<<shift | |

MOV r3,#13-4 @ r3 = 13-shift | |

find_shift_loop: | |

TST r0,r2 @ if (n & (1<<shift)) == 0 | |

MOV r2,r2,LSL #1 | |

SUBEQ r3,r3,#1 @ shift-- | |

BEQ find_shift_loop | |

MOV r2,#2 | |

MOV r2,r2,LSL r3 @ r2 = step = 2<<shift | |

@ presymmetry | |

@ r0 = n (a multiple of 4) | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

ADD r4, r1, r0, LSL #1 @ r4 = aX = in+(n>>1) | |

ADD r14,r1, r0 @ r14= in+(n>>2) | |

SUB r4, r4, #3*4 @ r4 = aX = in+n2-3 | |

ADRL r7, .Lsincos_lookup | |

LDR r5, [r7] @ r5 = T=sincos_lookup0 | |

ADD r5, r7 | |

presymmetry_loop1: | |

LDR r7, [r4,#8] @ r6 = s2 = aX[2] | |

LDR r11,[r5,#4] @ r11= T[1] | |

LDR r6, [r4] @ r6 = s0 = aX[0] | |

LDR r10,[r5],r2,LSL #2 @ r10= T[0] T += step | |

@ XPROD31(s0, s2, T[0], T[1], 0xaX[0], &ax[2]) | |

SMULL r8, r9, r7, r11 @ (r8, r9) = s2*T[1] | |

@ stall | |

@ stall ? | |

SMLAL r8, r9, r6, r10 @ (r8, r9) += s0*T[0] | |

RSB r6, r6, #0 | |

@ stall ? | |

SMULL r8, r12,r7, r10 @ (r8, r12) = s2*T[0] | |

MOV r9, r9, LSL #1 | |

@ stall ? | |

SMLAL r8, r12,r6, r11 @ (r8, r12) -= s0*T[1] | |

STR r9, [r4],#-16 @ aX[0] = r9 | |

CMP r4,r14 | |

MOV r12,r12,LSL #1 | |

STR r12,[r4,#8+16] @ aX[2] = r12 | |

BGE presymmetry_loop1 @ while (aX >= in+n4) | |

presymmetry_loop2: | |

LDR r6,[r4] @ r6 = s0 = aX[0] | |

LDR r10,[r5,#4] @ r10= T[1] | |

LDR r7,[r4,#8] @ r6 = s2 = aX[2] | |

LDR r11,[r5],-r2,LSL #2 @ r11= T[0] T -= step | |

@ XPROD31(s0, s2, T[1], T[0], 0xaX[0], &ax[2]) | |

SMULL r8, r9, r6, r10 @ (r8, r9) = s0*T[1] | |

@ stall | |

@ stall ? | |

SMLAL r8, r9, r7, r11 @ (r8, r9) += s2*T[0] | |

RSB r6, r6, #0 | |

@ stall ? | |

SMULL r8, r12,r7, r10 @ (r8, r12) = s2*T[1] | |

MOV r9, r9, LSL #1 | |

@ stall ? | |

SMLAL r8, r12,r6, r11 @ (r8, r12) -= s0*T[0] | |

STR r9, [r4],#-16 @ aX[0] = r9 | |

CMP r4,r1 | |

MOV r12,r12,LSL #1 | |

STR r12,[r4,#8+16] @ aX[2] = r12 | |

BGE presymmetry_loop2 @ while (aX >= in) | |

@ r0 = n | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

STMFD r13!,{r3} | |

ADRL r4, .Lsincos_lookup | |

LDR r5, [r4] @ r5 = T=sincos_lookup0 | |

ADD r5, r4 | |

ADD r4, r1, r0, LSL #1 @ r4 = aX = in+(n>>1) | |

SUB r4, r4, #4*4 @ r4 = aX = in+(n>>1)-4 | |

LDR r11,[r5,#4] @ r11= T[1] | |

LDR r10,[r5],r2, LSL #2 @ r10= T[0] T += step | |

presymmetry_loop3: | |

LDR r8,[r1],#16 @ r8 = ro0 = bX[0] | |

LDR r9,[r1,#8-16] @ r9 = ro2 = bX[2] | |

LDR r6,[r4] @ r6 = ri0 = aX[0] | |

@ XNPROD31( ro2, ro0, T[1], T[0], 0xaX[0], &aX[2] ) | |

@ aX[0] = (ro2*T[1] - ro0*T[0])>>31 aX[2] = (ro0*T[1] + ro2*T[0])>>31 | |

SMULL r14,r12,r8, r11 @ (r14,r12) = ro0*T[1] | |

RSB r8,r8,#0 @ r8 = -ro0 | |

@ Stall ? | |

SMLAL r14,r12,r9, r10 @ (r14,r12) += ro2*T[0] | |

LDR r7,[r4,#8] @ r7 = ri2 = aX[2] | |

@ Stall ? | |

SMULL r14,r3, r9, r11 @ (r14,r3) = ro2*T[1] | |

MOV r12,r12,LSL #1 | |

LDR r11,[r5,#4] @ r11= T[1] | |

SMLAL r14,r3, r8, r10 @ (r14,r3) -= ro0*T[0] | |

LDR r10,[r5],r2, LSL #2 @ r10= T[0] T += step | |

STR r12,[r4,#8] | |

MOV r3, r3, LSL #1 | |

STR r3, [r4],#-16 | |

@ XNPROD31( ri2, ri0, T[0], T[1], 0xbX[0], &bX[2] ) | |

@ bX[0] = (ri2*T[0] - ri0*T[1])>>31 bX[2] = (ri0*T[0] + ri2*T[1])>>31 | |

SMULL r14,r12,r6, r10 @ (r14,r12) = ri0*T[0] | |

RSB r6,r6,#0 @ r6 = -ri0 | |

@ stall ? | |

SMLAL r14,r12,r7, r11 @ (r14,r12) += ri2*T[1] | |

@ stall ? | |

@ stall ? | |

SMULL r14,r3, r7, r10 @ (r14,r3) = ri2*T[0] | |

MOV r12,r12,LSL #1 | |

@ stall ? | |

SMLAL r14,r3, r6, r11 @ (r14,r3) -= ri0*T[1] | |

CMP r4,r1 | |

STR r12,[r1,#8-16] | |

MOV r3, r3, LSL #1 | |

STR r3, [r1,#-16] | |

BGE presymmetry_loop3 | |

SUB r1,r1,r0 @ r1 = in -= n>>2 (i.e. restore in) | |

LDR r3,[r13] | |

STR r2,[r13,#-4]! | |

@ mdct_butterflies | |

@ r0 = n = (points * 2) | |

@ r1 = in = x | |

@ r2 = i | |

@ r3 = shift | |

STMFD r13!,{r0-r1} | |

ADRL r4, .Lsincos_lookup | |

LDR r5, [r4] | |

ADD r5, r4 | |

RSBS r4,r3,#6 @ r4 = stages = 7-shift then --stages | |

BLE no_generics | |

MOV r14,#4 @ r14= 4 (i=0) | |

MOV r6, r14,LSL r3 @ r6 = (4<<i)<<shift | |

mdct_butterflies_loop1: | |

MOV r0, r0, LSR #1 @ r0 = points>>i = POINTS | |

MOV r2, r14,LSR #2 @ r2 = (1<<i)-j (j=0) | |

STMFD r13!,{r4,r14} | |

mdct_butterflies_loop2: | |

@ mdct_butterfly_generic(x+POINTS*j, POINTS, 4<<(i+shift)) | |

@ mdct_butterfly_generic(r1, r0, r6) | |

@ r0 = points | |

@ r1 = x | |

@ preserve r2 (external loop counter) | |

@ preserve r3 | |

@ preserve r4 (external loop counter) | |

@ r5 = T = sincos_lookup0 | |

@ r6 = step | |

@ preserve r14 | |

STR r2,[r13,#-4]! @ stack r2 | |

ADD r1,r1,r0,LSL #1 @ r1 = x2+4 = x + (POINTS>>1) | |

ADD r7,r1,r0,LSL #1 @ r7 = x1+4 = x + POINTS | |

ADD r12,r5,#1024*4 @ r12= sincos_lookup0+1024 | |

mdct_bufferfly_generic_loop1: | |

LDMDB r7!,{r2,r3,r8,r11} @ r2 = x1[0] | |

@ r3 = x1[1] | |

@ r8 = x1[2] | |

@ r11= x1[3] x1 -= 4 | |

LDMDB r1!,{r4,r9,r10,r14} @ r4 = x2[0] | |

@ r9 = x2[1] | |

@ r10= x2[2] | |

@ r14= x2[3] x2 -= 4 | |

SUB r2, r2, r3 @ r2 = s0 = x1[0] - x1[1] | |

ADD r3, r2, r3, LSL #1 @ r3 = x1[0] + x1[1] (-> x1[0]) | |

SUB r11,r11,r8 @ r11= s1 = x1[3] - x1[2] | |

ADD r8, r11,r8, LSL #1 @ r8 = x1[3] + x1[2] (-> x1[2]) | |

SUB r9, r9, r4 @ r9 = s2 = x2[1] - x2[0] | |

ADD r4, r9, r4, LSL #1 @ r4 = x2[1] + x2[0] (-> x1[1]) | |

SUB r14,r14,r10 @ r14= s3 = x2[3] - x2[2] | |

ADD r10,r14,r10,LSL #1 @ r10= x2[3] + x2[2] (-> x1[3]) | |

STMIA r7,{r3,r4,r8,r10} | |

@ r0 = points | |

@ r1 = x2 | |

@ r2 = s0 | |

@ r3 free | |

@ r4 free | |

@ r5 = T | |

@ r6 = step | |

@ r7 = x1 | |

@ r8 free | |

@ r9 = s2 | |

@ r10 free | |

@ r11= s1 | |

@ r12= limit | |

@ r14= s3 | |

LDR r8, [r5,#4] @ r8 = T[1] | |

LDR r10,[r5],r6,LSL #2 @ r10= T[0] T += step | |

@ XPROD31(s1, s0, T[0], T[1], &x2[0], &x2[2]) | |

@ x2[0] = (s1*T[0] + s0*T[1])>>31 x2[2] = (s0*T[0] - s1*T[1])>>31 | |

@ stall Xscale | |

SMULL r4, r3, r2, r8 @ (r4, r3) = s0*T[1] | |

SMLAL r4, r3, r11,r10 @ (r4, r3) += s1*T[0] | |

RSB r11,r11,#0 | |

SMULL r11,r4, r8, r11 @ (r11,r4) = -s1*T[1] | |

SMLAL r11,r4, r2, r10 @ (r11,r4) += s0*T[0] | |

MOV r2, r3, LSL #1 @ r2 = r3<<1 = Value for x2[0] | |

@ XPROD31(s2, s3, T[0], T[1], &x2[1], &x2[3]) | |

@ x2[1] = (s2*T[0] + s3*T[1])>>31 x2[3] = (s3*T[0] - s2*T[1])>>31 | |

SMULL r11,r3, r9, r10 @ (r11,r3) = s2*T[0] | |

MOV r4, r4, LSL #1 @ r4 = r4<<1 = Value for x2[2] | |

SMLAL r11,r3, r14,r8 @ (r11,r3) += s3*T[1] | |

RSB r9, r9, #0 | |

SMULL r10,r11,r14,r10 @ (r10,r11) = s3*T[0] | |

MOV r3, r3, LSL #1 @ r3 = r3<<1 = Value for x2[1] | |

SMLAL r10,r11,r9,r8 @ (r10,r11) -= s2*T[1] | |

CMP r5, r12 | |

MOV r11,r11,LSL #1 @ r11= r11<<1 = Value for x2[3] | |

STMIA r1,{r2,r3,r4,r11} | |

BLT mdct_bufferfly_generic_loop1 | |

SUB r12,r12,#1024*4 | |

mdct_bufferfly_generic_loop2: | |

LDMDB r7!,{r2,r3,r9,r10} @ r2 = x1[0] | |

@ r3 = x1[1] | |

@ r9 = x1[2] | |

@ r10= x1[3] x1 -= 4 | |

LDMDB r1!,{r4,r8,r11,r14} @ r4 = x2[0] | |

@ r8 = x2[1] | |

@ r11= x2[2] | |

@ r14= x2[3] x2 -= 4 | |

SUB r2, r2, r3 @ r2 = s0 = x1[0] - x1[1] | |

ADD r3, r2, r3, LSL #1 @ r3 = x1[0] + x1[1] (-> x1[0]) | |

SUB r9, r9,r10 @ r9 = s1 = x1[2] - x1[3] | |

ADD r10,r9,r10, LSL #1 @ r10= x1[2] + x1[3] (-> x1[2]) | |

SUB r4, r4, r8 @ r4 = s2 = x2[0] - x2[1] | |

ADD r8, r4, r8, LSL #1 @ r8 = x2[0] + x2[1] (-> x1[1]) | |

SUB r14,r14,r11 @ r14= s3 = x2[3] - x2[2] | |

ADD r11,r14,r11,LSL #1 @ r11= x2[3] + x2[2] (-> x1[3]) | |

STMIA r7,{r3,r8,r10,r11} | |

@ r0 = points | |

@ r1 = x2 | |

@ r2 = s0 | |

@ r3 free | |

@ r4 = s2 | |

@ r5 = T | |

@ r6 = step | |

@ r7 = x1 | |

@ r8 free | |

@ r9 = s1 | |

@ r10 free | |

@ r11 free | |

@ r12= limit | |

@ r14= s3 | |

LDR r8, [r5,#4] @ r8 = T[1] | |

LDR r10,[r5],-r6,LSL #2 @ r10= T[0] T -= step | |

@ XNPROD31(s0, s1, T[0], T[1], &x2[0], &x2[2]) | |

@ x2[0] = (s0*T[0] - s1*T[1])>>31 x2[2] = (s1*T[0] + s0*T[1])>>31 | |

@ stall Xscale | |

SMULL r3, r11,r2, r8 @ (r3, r11) = s0*T[1] | |

SMLAL r3, r11,r9, r10 @ (r3, r11) += s1*T[0] | |

RSB r9, r9, #0 | |

SMULL r3, r2, r10,r2 @ (r3, r2) = s0*T[0] | |

SMLAL r3, r2, r9, r8 @ (r3, r2) += -s1*T[1] | |

MOV r9, r11,LSL #1 @ r9 = r11<<1 = Value for x2[2] | |

@ XNPROD31(s3, s2, T[0], T[1], &x2[1], &x2[3]) | |

@ x2[1] = (s3*T[0] - s2*T[1])>>31 x2[3] = (s2*T[0] + s3*T[1])>>31 | |

SMULL r3, r11,r4, r10 @ (r3,r11) = s2*T[0] | |

MOV r2, r2, LSL #1 @ r2 = r2<<1 = Value for x2[0] | |

SMLAL r3, r11,r14,r8 @ (r3,r11) += s3*T[1] | |

RSB r4, r4, #0 | |

SMULL r10,r3,r14,r10 @ (r10,r3) = s3*T[0] | |

MOV r11,r11,LSL #1 @ r11= r11<<1 = Value for x2[3] | |

SMLAL r10,r3, r4, r8 @ (r10,r3) -= s2*T[1] | |

CMP r5, r12 | |

MOV r3, r3, LSL #1 @ r3 = r3<<1 = Value for x2[1] | |

STMIA r1,{r2,r3,r9,r11} | |

BGT mdct_bufferfly_generic_loop2 | |

LDR r2,[r13],#4 @ unstack r2 | |

ADD r1, r1, r0, LSL #2 @ r1 = x+POINTS*j | |

@ stall Xscale | |

SUBS r2, r2, #1 @ r2-- (j++) | |

BGT mdct_butterflies_loop2 | |

LDMFD r13!,{r4,r14} | |

LDR r1,[r13,#4] | |

SUBS r4, r4, #1 @ stages-- | |

MOV r14,r14,LSL #1 @ r14= 4<<i (i++) | |

MOV r6, r6, LSL #1 @ r6 = step <<= 1 (i++) | |

BGE mdct_butterflies_loop1 | |

LDMFD r13,{r0-r1} | |

no_generics: | |

@ mdct_butterflies part2 (loop around mdct_bufferfly_32) | |

@ r0 = points | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

mdct_bufferflies_loop3: | |

@ mdct_bufferfly_32 | |

@ block1 | |

ADD r4, r1, #16*4 @ r4 = &in[16] | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[16] | |

@ r6 = x[17] | |

@ r9 = x[18] | |

@ r10= x[19] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] | |

@ r8 = x[1] | |

@ r11= x[2] | |

@ r12= x[3] | |

SUB r5, r5, r6 @ r5 = s0 = x[16] - x[17] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[16] + x[17] -> x[16] | |

SUB r9, r9, r10 @ r9 = s1 = x[18] - x[19] | |

ADD r10,r9, r10,LSL #1 @ r10= x[18] + x[19] -> x[18] | |

SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] | |

ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[17] | |

SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] | |

ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[19] | |

STMIA r4!,{r6,r7,r10,r11} | |

LDR r6,cPI1_8 | |

LDR r7,cPI3_8 | |

@ XNPROD31( s0, s1, cPI3_8, cPI1_8, &x[ 0], &x[ 2] ) | |

@ x[0] = s0*cPI3_8 - s1*cPI1_8 x[2] = s1*cPI3_8 + s0*cPI1_8 | |

@ stall Xscale | |

SMULL r14,r11,r5, r6 @ (r14,r11) = s0*cPI1_8 | |

SMLAL r14,r11,r9, r7 @ (r14,r11) += s1*cPI3_8 | |

RSB r9, r9, #0 | |

SMULL r14,r5, r7, r5 @ (r14,r5) = s0*cPI3_8 | |

SMLAL r14,r5, r9, r6 @ (r14,r5) -= s1*cPI1_8 | |

MOV r11,r11,LSL #1 | |

MOV r5, r5, LSL #1 | |

@ XPROD31 ( s2, s3, cPI1_8, cPI3_8, &x[ 1], &x[ 3] ) | |

@ x[1] = s2*cPI1_8 + s3*cPI3_8 x[3] = s3*cPI1_8 - s2*cPI3_8 | |

SMULL r14,r9, r8, r6 @ (r14,r9) = s2*cPI1_8 | |

SMLAL r14,r9, r12,r7 @ (r14,r9) += s3*cPI3_8 | |

RSB r8,r8,#0 | |

SMULL r14,r12,r6, r12 @ (r14,r12) = s3*cPI1_8 | |

SMLAL r14,r12,r8, r7 @ (r14,r12) -= s2*cPI3_8 | |

MOV r9, r9, LSL #1 | |

MOV r12,r12,LSL #1 | |

STMIA r1!,{r5,r9,r11,r12} | |

@ block2 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[20] | |

@ r6 = x[21] | |

@ r9 = x[22] | |

@ r10= x[23] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[4] | |

@ r8 = x[5] | |

@ r11= x[6] | |

@ r12= x[7] | |

SUB r5, r5, r6 @ r5 = s0 = x[20] - x[21] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[20] + x[21] -> x[20] | |

SUB r9, r9, r10 @ r9 = s1 = x[22] - x[23] | |

ADD r10,r9, r10,LSL #1 @ r10= x[22] + x[23] -> x[22] | |

SUB r8, r8, r7 @ r8 = s2 = x[ 5] - x[ 4] | |

ADD r7, r8, r7, LSL #1 @ r7 = x[ 5] + x[ 4] -> x[21] | |

SUB r12,r12,r11 @ r12= s3 = x[ 7] - x[ 6] | |

ADD r11,r12,r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[23] | |

LDR r14,cPI2_8 | |

STMIA r4!,{r6,r7,r10,r11} | |

SUB r5, r5, r9 @ r5 = s0 - s1 | |

ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 | |

SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 | |

SUB r12,r12,r8 @ r12= s3 - s2 | |

ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 | |

SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 | |

MOV r5, r5, LSL #1 | |

SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 | |

MOV r8, r8, LSL #1 | |

SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 | |

MOV r9, r9, LSL #1 | |

MOV r12,r12,LSL #1 | |

STMIA r1!,{r5,r8,r9,r12} | |

@ block3 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[24] | |

@ r6 = x[25] | |

@ r9 = x[25] | |

@ r10= x[26] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[8] | |

@ r8 = x[9] | |

@ r11= x[10] | |

@ r12= x[11] | |

SUB r5, r5, r6 @ r5 = s0 = x[24] - x[25] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[24] + x[25] -> x[25] | |

SUB r9, r9, r10 @ r9 = s1 = x[26] - x[27] | |

ADD r10,r9, r10,LSL #1 @ r10= x[26] + x[27] -> x[26] | |

SUB r8, r8, r7 @ r8 = s2 = x[ 9] - x[ 8] | |

ADD r7, r8, r7, LSL #1 @ r7 = x[ 9] + x[ 8] -> x[25] | |

SUB r12,r12,r11 @ r12= s3 = x[11] - x[10] | |

ADD r11,r12,r11, LSL #1 @ r11= x[11] + x[10] -> x[27] | |

STMIA r4!,{r6,r7,r10,r11} | |

LDR r6,cPI3_8 | |

LDR r7,cPI1_8 | |

@ XNPROD31( s0, s1, cPI1_8, cPI3_8, &x[ 8], &x[10] ) | |

@ x[8] = s0*cPI1_8 - s1*cPI3_8 x[10] = s1*cPI1_8 + s0*cPI3_8 | |

@ stall Xscale | |

SMULL r14,r11,r5, r6 @ (r14,r11) = s0*cPI3_8 | |

SMLAL r14,r11,r9, r7 @ (r14,r11) += s1*cPI1_8 | |

RSB r9, r9, #0 | |

SMULL r14,r5, r7, r5 @ (r14,r5) = s0*cPI1_8 | |

SMLAL r14,r5, r9, r6 @ (r14,r5) -= s1*cPI3_8 | |

MOV r11,r11,LSL #1 | |

MOV r5, r5, LSL #1 | |

@ XPROD31 ( s2, s3, cPI3_8, cPI1_8, &x[ 9], &x[11] ) | |

@ x[9] = s2*cPI3_8 + s3*cPI1_8 x[11] = s3*cPI3_8 - s2*cPI1_8 | |

SMULL r14,r9, r8, r6 @ (r14,r9) = s2*cPI3_8 | |

SMLAL r14,r9, r12,r7 @ (r14,r9) += s3*cPI1_8 | |

RSB r8,r8,#0 | |

SMULL r14,r12,r6, r12 @ (r14,r12) = s3*cPI3_8 | |

SMLAL r14,r12,r8, r7 @ (r14,r12) -= s2*cPI1_8 | |

MOV r9, r9, LSL #1 | |

MOV r12,r12,LSL #1 | |

STMIA r1!,{r5,r9,r11,r12} | |

@ block4 | |

LDMIA r4,{r5,r6,r10,r11} @ r5 = x[28] | |

@ r6 = x[29] | |

@ r10= x[30] | |

@ r11= x[31] | |

LDMIA r1,{r8,r9,r12,r14} @ r8 = x[12] | |

@ r9 = x[13] | |

@ r12= x[14] | |

@ r14= x[15] | |

SUB r5, r5, r6 @ r5 = s0 = x[28] - x[29] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[28] + x[29] -> x[28] | |

SUB r7, r14,r12 @ r7 = s3 = x[15] - x[14] | |

ADD r12,r7, r12, LSL #1 @ r12= x[15] + x[14] -> x[31] | |

SUB r10,r10,r11 @ r10= s1 = x[30] - x[31] | |

ADD r11,r10,r11,LSL #1 @ r11= x[30] + x[31] -> x[30] | |

SUB r14, r8, r9 @ r14= s2 = x[12] - x[13] | |

ADD r9, r14, r9, LSL #1 @ r9 = x[12] + x[13] -> x[29] | |

STMIA r4!,{r6,r9,r11,r12} | |

STMIA r1!,{r5,r7,r10,r14} | |

@ mdct_butterfly16 (1st version) | |

@ block 1 | |

SUB r1,r1,#16*4 | |

ADD r4,r1,#8*4 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[ 8] | |

@ r6 = x[ 9] | |

@ r9 = x[10] | |

@ r10= x[11] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] | |

@ r8 = x[1] | |

@ r11= x[2] | |

@ r12= x[3] | |

SUB r5, r5, r6 @ r5 = s0 = x[ 8] - x[ 9] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[ 8] + x[ 9] -> x[ 8] | |

SUB r9, r9, r10 @ r9 = s1 = x[10] - x[11] | |

ADD r10,r9, r10,LSL #1 @ r10= x[10] + x[11] -> x[10] | |

SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] | |

ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[ 9] | |

SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] | |

ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[11] | |

LDR r14,cPI2_8 | |

STMIA r4!,{r6,r7,r10,r11} | |

SUB r5, r5, r9 @ r5 = s0 - s1 | |

ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 | |

SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 | |

SUB r12,r12,r8 @ r12= s3 - s2 | |

ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 | |

SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 | |

MOV r5, r5, LSL #1 | |

SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 | |

MOV r8, r8, LSL #1 | |

SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 | |

MOV r9, r9, LSL #1 | |

MOV r12,r12,LSL #1 | |

STMIA r1!,{r5,r8,r9,r12} | |

@ block4 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[12] | |

@ r6 = x[13] | |

@ r9 = x[14] | |

@ r10= x[15] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[ 4] | |

@ r8 = x[ 5] | |

@ r11= x[ 6] | |

@ r12= x[ 7] | |

SUB r14,r7, r8 @ r14= s0 = x[ 4] - x[ 5] | |

ADD r8, r14,r8, LSL #1 @ r8 = x[ 4] + x[ 5] -> x[13] | |

SUB r7, r12,r11 @ r7 = s1 = x[ 7] - x[ 6] | |

ADD r11,r7, r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[15] | |

SUB r5, r5, r6 @ r5 = s2 = x[12] - x[13] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[12] + x[13] -> x[12] | |

SUB r12,r9, r10 @ r12= s3 = x[14] - x[15] | |

ADD r10,r12,r10,LSL #1 @ r10= x[14] + x[15] -> x[14] | |

STMIA r4!,{r6,r8,r10,r11} | |

STMIA r1!,{r5,r7,r12,r14} | |

@ mdct_butterfly_8 | |

LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} | |

@ r6 = x[0] | |

@ r7 = x[1] | |

@ r8 = x[2] | |

@ r9 = x[3] | |

@ r10= x[4] | |

@ r11= x[5] | |

@ r12= x[6] | |

@ r14= x[7] | |

ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] | |

SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] | |

ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] | |

SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] | |

ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] | |

SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] | |

ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] | |

SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] | |

ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 | |

SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 | |

SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 | |

ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 | |

SUB r10,r10,r6 @ r10= x[4] = s4 - s0 | |

SUB r11,r12,r8 @ r11= x[5] = s6 - s2 | |

ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 | |

ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 | |

STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} | |

@ mdct_butterfly_8 | |

LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} | |

@ r6 = x[0] | |

@ r7 = x[1] | |

@ r8 = x[2] | |

@ r9 = x[3] | |

@ r10= x[4] | |

@ r11= x[5] | |

@ r12= x[6] | |

@ r14= x[7] | |

ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] | |

SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] | |

ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] | |

SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] | |

ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] | |

SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] | |

ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] | |

SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] | |

ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 | |

SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 | |

SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 | |

ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 | |

SUB r10,r10,r6 @ r10= x[4] = s4 - s0 | |

SUB r11,r12,r8 @ r11= x[5] = s6 - s2 | |

ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 | |

ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 | |

STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} | |

@ block 2 | |

ADD r1,r1,#16*4-8*4 | |

ADD r4,r1,#8*4 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[ 8] | |

@ r6 = x[ 9] | |

@ r9 = x[10] | |

@ r10= x[11] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] | |

@ r8 = x[1] | |

@ r11= x[2] | |

@ r12= x[3] | |

SUB r5, r5, r6 @ r5 = s0 = x[ 8] - x[ 9] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[ 8] + x[ 9] -> x[ 8] | |

SUB r9, r9, r10 @ r9 = s1 = x[10] - x[11] | |

ADD r10,r9, r10,LSL #1 @ r10= x[10] + x[11] -> x[10] | |

SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] | |

ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[ 9] | |

SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] | |

ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[11] | |

LDR r14,cPI2_8 | |

STMIA r4!,{r6,r7,r10,r11} | |

SUB r5, r5, r9 @ r5 = s0 - s1 | |

ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 | |

SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 | |

SUB r12,r12,r8 @ r12= s3 - s2 | |

ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 | |

SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 | |

MOV r5, r5, LSL #1 | |

SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 | |

MOV r8, r8, LSL #1 | |

SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 | |

MOV r9, r9, LSL #1 | |

MOV r12,r12,LSL #1 | |

STMIA r1!,{r5,r8,r9,r12} | |

@ block4 | |

LDMIA r4,{r5,r6,r9,r10} @ r5 = x[12] | |

@ r6 = x[13] | |

@ r9 = x[14] | |

@ r10= x[15] | |

LDMIA r1,{r7,r8,r11,r12} @ r7 = x[ 4] | |

@ r8 = x[ 5] | |

@ r11= x[ 6] | |

@ r12= x[ 7] | |

SUB r5, r5, r6 @ r5 = s2 = x[12] - x[13] | |

ADD r6, r5, r6, LSL #1 @ r6 = x[12] + x[13] -> x[12] | |

SUB r9, r9, r10 @ r9 = s3 = x[14] - x[15] | |

ADD r10,r9, r10,LSL #1 @ r10= x[14] + x[15] -> x[14] | |

SUB r14,r7, r8 @ r14= s0 = x[ 4] - x[ 5] | |

ADD r8, r14,r8, LSL #1 @ r8 = x[ 4] + x[ 5] -> x[13] | |

SUB r7, r12,r11 @ r7 = s1 = x[ 7] - x[ 6] | |

ADD r11,r7, r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[15] | |

STMIA r4!,{r6,r8,r10,r11} | |

STMIA r1!,{r5,r7,r9,r14} | |

@ mdct_butterfly_8 | |

LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} | |

@ r6 = x[0] | |

@ r7 = x[1] | |

@ r8 = x[2] | |

@ r9 = x[3] | |

@ r10= x[4] | |

@ r11= x[5] | |

@ r12= x[6] | |

@ r14= x[7] | |

ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] | |

SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] | |

ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] | |

SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] | |

ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] | |

SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] | |

ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] | |

SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] | |

ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 | |

SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 | |

SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 | |

ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 | |

SUB r10,r10,r6 @ r10= x[4] = s4 - s0 | |

SUB r11,r12,r8 @ r11= x[5] = s6 - s2 | |

ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 | |

ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 | |

STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} | |

@ mdct_butterfly_8 | |

LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} | |

@ r6 = x[0] | |

@ r7 = x[1] | |

@ r8 = x[2] | |

@ r9 = x[3] | |

@ r10= x[4] | |

@ r11= x[5] | |

@ r12= x[6] | |

@ r14= x[7] | |

ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] | |

SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] | |

ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] | |

SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] | |

ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] | |

SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] | |

ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] | |

SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] | |

ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 | |

SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 | |

SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 | |

ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 | |

SUB r10,r10,r6 @ r10= x[4] = s4 - s0 | |

SUB r11,r12,r8 @ r11= x[5] = s6 - s2 | |

ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 | |

ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 | |

STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} | |

ADD r1,r1,#8*4 | |

SUBS r0,r0,#64 | |

BGT mdct_bufferflies_loop3 | |

LDMFD r13,{r0-r3} | |

mdct_bitreverseARM: | |

@ r0 = points = n | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

MOV r4, #0 @ r4 = bit = 0 | |

ADD r5, r1, r0, LSL #1 @ r5 = w = x + (n>>1) | |

ADR r6, bitrev | |

SUB r5, r5, #8 | |

brev_lp: | |

LDRB r7, [r6, r4, LSR #6] | |

AND r8, r4, #0x3f | |

LDRB r8, [r6, r8] | |

ADD r4, r4, #1 @ bit++ | |

@ stall XScale | |

ORR r7, r7, r8, LSL #6 @ r7 = bitrev[bit] | |

MOV r7, r7, LSR r3 | |

ADD r9, r1, r7, LSL #2 @ r9 = xx = x + (b>>shift) | |

CMP r5, r9 @ if (w > xx) | |

LDR r10,[r5],#-8 @ r10 = w[0] w -= 2 | |

LDRGT r11,[r5,#12] @ r11 = w[1] | |

LDRGT r12,[r9] @ r12 = xx[0] | |

LDRGT r14,[r9,#4] @ r14 = xx[1] | |

STRGT r10,[r9] @ xx[0]= w[0] | |

STRGT r11,[r9,#4] @ xx[1]= w[1] | |

STRGT r12,[r5,#8] @ w[0] = xx[0] | |

STRGT r14,[r5,#12] @ w[1] = xx[1] | |

CMP r5,r1 | |

BGT brev_lp | |

@ mdct_step7 | |

@ r0 = points | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

CMP r2, #4 @ r5 = T = (step>=4) ? | |

ADR r7, .Lsincos_lookup @ sincos_lookup0 + | |

ADDLT r7, #4 @ sincos_lookup1 | |

LDR r5, [r7] | |

ADD r5, r7 | |

ADD r7, r1, r0, LSL #1 @ r7 = w1 = x + (n>>1) | |

ADDGE r5, r5, r2, LSL #1 @ (step>>1) | |

ADD r8, r5, #1024*4 @ r8 = Ttop | |

step7_loop1: | |

LDR r6, [r1] @ r6 = w0[0] | |

LDR r9, [r1,#4] @ r9 = w0[1] | |

LDR r10,[r7,#-8]! @ r10= w1[0] w1 -= 2 | |

LDR r11,[r7,#4] @ r11= w1[1] | |

LDR r14,[r5,#4] @ r14= T[1] | |

LDR r12,[r5],r2,LSL #2 @ r12= T[0] T += step | |

ADD r6, r6, r10 @ r6 = s0 = w0[0] + w1[0] | |

SUB r10,r6, r10,LSL #1 @ r10= s1b= w0[0] - w1[0] | |

SUB r11,r11,r9 @ r11= s1 = w1[1] - w0[1] | |

ADD r9, r11,r9, LSL #1 @ r9 = s0b= w1[1] + w0[1] | |

@ Can save 1 cycle by using SMULL SMLAL - at the cost of being | |

@ 1 off. | |

SMULL r0, r3, r6, r14 @ (r0,r3) = s0*T[1] | |

SMULL r0, r4, r11,r12 @ (r0,r4) += s1*T[0] = s2 | |

ADD r3, r3, r4 | |

SMULL r0, r14,r11,r14 @ (r0,r14) = s1*T[1] | |

SMULL r0, r12,r6, r12 @ (r0,r12) += s0*T[0] = s3 | |

SUB r14,r14,r12 | |

@ r9 = s0b<<1 | |

@ r10= s1b<<1 | |

ADD r9, r3, r9, ASR #1 @ r9 = s0b + s2 | |

SUB r3, r9, r3, LSL #1 @ r3 = s0b - s2 | |

SUB r12,r14,r10,ASR #1 @ r12= s3 - s1b | |

ADD r10,r14,r10,ASR #1 @ r10= s3 + s1b | |

STR r9, [r1],#4 | |

STR r10,[r1],#4 @ w0 += 2 | |

STR r3, [r7] | |

STR r12,[r7,#4] | |

CMP r5,r8 | |

BLT step7_loop1 | |

step7_loop2: | |

LDR r6, [r1] @ r6 = w0[0] | |

LDR r9, [r1,#4] @ r9 = w0[1] | |

LDR r10,[r7,#-8]! @ r10= w1[0] w1 -= 2 | |

LDR r11,[r7,#4] @ r11= w1[1] | |

LDR r14,[r5,-r2,LSL #2]! @ r12= T[1] T -= step | |

LDR r12,[r5,#4] @ r14= T[0] | |

ADD r6, r6, r10 @ r6 = s0 = w0[0] + w1[0] | |

SUB r10,r6, r10,LSL #1 @ r10= s1b= w0[0] - w1[0] | |

SUB r11,r11,r9 @ r11= s1 = w1[1] - w0[1] | |

ADD r9, r11,r9, LSL #1 @ r9 = s0b= w1[1] + w0[1] | |

@ Can save 1 cycle by using SMULL SMLAL - at the cost of being | |

@ 1 off. | |

SMULL r0, r3, r6, r14 @ (r0,r3) = s0*T[0] | |

SMULL r0, r4, r11,r12 @ (r0,r4) += s1*T[1] = s2 | |

ADD r3, r3, r4 | |

SMULL r0, r14,r11,r14 @ (r0,r14) = s1*T[0] | |

SMULL r0, r12,r6, r12 @ (r0,r12) += s0*T[1] = s3 | |

SUB r14,r14,r12 | |

@ r9 = s0b<<1 | |

@ r10= s1b<<1 | |

ADD r9, r3, r9, ASR #1 @ r9 = s0b + s2 | |

SUB r3, r9, r3, LSL #1 @ r3 = s0b - s2 | |

SUB r12,r14,r10,ASR #1 @ r12= s3 - s1b | |

ADD r10,r14,r10,ASR #1 @ r10= s3 + s1b | |

STR r9, [r1],#4 | |

STR r10,[r1],#4 @ w0 += 2 | |

STR r3, [r7] | |

STR r12,[r7,#4] | |

CMP r1,r7 | |

BLT step7_loop2 | |

LDMFD r13!,{r0-r3} | |

@ r0 = points | |

@ r1 = in | |

@ r2 = step | |

@ r3 = shift | |

MOV r2, r2, ASR #2 @ r2 = step >>= 2 | |

CMP r2, #0 | |

CMPNE r2, #1 | |

BEQ mdct_end | |

@ step > 1 (default case) | |

CMP r2, #4 @ r5 = T = (step>=4) ? | |

ADR r7, .Lsincos_lookup @ sincos_lookup0 + | |

ADDLT r7, #4 @ sincos_lookup1 | |

LDR r5, [r7] | |

ADD r5, r7 | |

ADD r7, r1, r0, LSL #1 @ r7 = iX = x + (n>>1) | |

ADDGE r5, r5, r2, LSL #1 @ (step>>1) | |

mdct_step8_default: | |

LDR r6, [r1],#4 @ r6 = s0 = x[0] | |

LDR r8, [r1],#4 @ r8 = -s1 = x[1] | |

LDR r12,[r5,#4] @ r12= T[1] | |

LDR r14,[r5],r2,LSL #2 @ r14= T[0] T += step | |

RSB r8, r8, #0 @ r8 = s1 | |

@ XPROD31(s0, s1, T[0], T[1], x, x+1) | |

@ x[0] = s0 * T[0] + s1 * T[1] x[1] = s1 * T[0] - s0 * T[1] | |

SMULL r9, r10, r8, r12 @ (r9,r10) = s1 * T[1] | |

CMP r1, r7 | |

SMLAL r9, r10, r6, r14 @ (r9,r10) += s0 * T[0] | |

RSB r6, r6, #0 @ r6 = -s0 | |

SMULL r9, r11, r8, r14 @ (r9,r11) = s1 * T[0] | |

MOV r10,r10,LSL #1 | |

SMLAL r9, r11, r6, r12 @ (r9,r11) -= s0 * T[1] | |

STR r10,[r1,#-8] | |

MOV r11,r11,LSL #1 | |

STR r11,[r1,#-4] | |

BLT mdct_step8_default | |

mdct_end: | |

MOV r0, r2 | |

LDMFD r13!,{r4-r11,PC} | |

cPI1_8: | |

.word 0x7641af3d | |

cPI2_8: | |

.word 0x5a82799a | |

cPI3_8: | |

.word 0x30fbc54d | |

bitrev: | |

.byte 0 | |

.byte 32 | |

.byte 16 | |

.byte 48 | |

.byte 8 | |

.byte 40 | |

.byte 24 | |

.byte 56 | |

.byte 4 | |

.byte 36 | |

.byte 20 | |

.byte 52 | |

.byte 12 | |

.byte 44 | |

.byte 28 | |

.byte 60 | |

.byte 2 | |

.byte 34 | |

.byte 18 | |

.byte 50 | |

.byte 10 | |

.byte 42 | |

.byte 26 | |

.byte 58 | |

.byte 6 | |

.byte 38 | |

.byte 22 | |

.byte 54 | |

.byte 14 | |

.byte 46 | |

.byte 30 | |

.byte 62 | |

.byte 1 | |

.byte 33 | |

.byte 17 | |

.byte 49 | |

.byte 9 | |

.byte 41 | |

.byte 25 | |

.byte 57 | |

.byte 5 | |

.byte 37 | |

.byte 21 | |

.byte 53 | |

.byte 13 | |

.byte 45 | |

.byte 29 | |

.byte 61 | |

.byte 3 | |

.byte 35 | |

.byte 19 | |

.byte 51 | |

.byte 11 | |

.byte 43 | |

.byte 27 | |

.byte 59 | |

.byte 7 | |

.byte 39 | |

.byte 23 | |

.byte 55 | |

.byte 15 | |

.byte 47 | |

.byte 31 | |

.byte 63 | |

.Lsincos_lookup: | |

.word sincos_lookup0-.Lsincos_lookup | |

.word sincos_lookup1-(.Lsincos_lookup+4) | |

@ END |