@ 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
@ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
@ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
@ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
@ ----------------------------------------------------------------------
.text
@ low 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
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 r7, [r3, #-4]! @ r7 = *--r
LDRB r6, [r10,#-1]! @ r6 = *--wR
LDRB r11,[r9],#1 @ r11= *wL++
MOV r12, r12, ASR #8
@ Can save a cycle here, at the cost of 1bit errors in rounding
MUL r11,r12,r11 @ r11 = *l * *wL++
MOV r7, r7, ASR #8
MLA r6, r7, r6, r11 @ r6 = *--r * *--wR
MOV r6, r6, ASR #9
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 r7, [r3],#4 @ r7 = *r++
LDRB r11,[r9],#1 @ r11= *wL++
LDRB r6, [r10,#-1]! @ r6 = *--wR
@ Can save a cycle here, at the cost of 1bit errors in rounding
MOV r12,r12,ASR #8
MUL r11,r12,r11 @ (r14,r11) = *l * *wL++
MOV r7, r7, ASR #8
MUL r6, r7, r6 @ (r14,r6) = *--r * *--wR
SUB r6, r6, r11
MOV r6, r6, ASR #9
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
LDR r5, =sincos_lookup0 @ r5 = T=sincos_lookup0
presymmetry_loop1:
LDR r7, [r4,#8] @ r6 = s2 = aX[2]
LDRB r11,[r5,#1] @ r11= T[1]
LDR r6, [r4],#-16 @ r6 = s0 = aX[0]
LDRB r10,[r5],r2 @ r10= T[0] T += step
MOV r6, r6, ASR #8
MOV r7, r7, ASR #8
@ XPROD31(s0, s2, T[0], T[1], 0xaX[0], &ax[2])
MUL r9, r6, r10 @ r9 = s0*T[0]
RSB r6, r6, #0
MLA r9, r7, r11,r9 @ r9 += s2*T[1]
CMP r4, r14
MUL r12,r7, r10 @ r12 = s2*T[0]
STR r9, [r4,#16] @ aX[0] = r9
MLA r12,r6, r11,r12 @ r12 -= s0*T[1]
STR r12,[r4,#8+16] @ aX[2] = r12
BGE presymmetry_loop1 @ while (aX >= in+n4)
presymmetry_loop2:
LDR r6, [r4],#-16 @ r6 = s0 = aX[0]
LDRB r10,[r5,#1] @ r10= T[1]
LDR r7, [r4,#16+8] @ r6 = s2 = aX[2]
LDRB r11,[r5],-r2 @ r11= T[0] T -= step
MOV r6, r6, ASR #8
MOV r7, r7, ASR #8
@ XPROD31(s0, s2, T[1], T[0], 0xaX[0], &ax[2])
MUL r9, r6, r10 @ r9 = s0*T[1]
RSB r6, r6, #0
MLA r9, r7, r11,r9 @ r9 += s2*T[0]
CMP r4, r1
MUL r12,r7, r10 @ r12 = s2*T[1]
STR r9, [r4,#16] @ aX[0] = r9
MLA r12,r6, r11,r12 @ r12 -= s0*T[0]
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}
LDR r5, =sincos_lookup0 @ r5 = T=sincos_lookup0
ADD r4, r1, r0, LSL #1 @ r4 = aX = in+(n>>1)
SUB r4, r4, #4*4 @ r4 = aX = in+(n>>1)-4
LDRB r11,[r5,#1] @ r11= T[1]
LDRB r10,[r5],r2 @ 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],#-16 @ r6 = ri0 = aX[0]
LDR r7, [r4,#8+16] @ r7 = ri2 = aX[2]
MOV r8, r8, ASR #8
MOV r9, r9, ASR #8
MOV r6, r6, ASR #8
@ 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
MUL r12,r8, r11 @ r12 = ro0*T[1]
MOV r7, r7, ASR #8
MLA r12,r9, r10,r12 @ r12 += ro2*T[0]
RSB r8, r8, #0 @ r8 = -ro0
MUL r3, r9, r11 @ r3 = ro2*T[1]
LDRB r11,[r5,#1] @ r11= T[1]
MLA r3, r8, r10,r3 @ r3 -= ro0*T[0]
LDRB r10,[r5],r2 @ r10= T[0] T += step
STR r12,[r4,#16+8]
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
MUL r12,r6, r10 @ r12 = ri0*T[0]
RSB r6, r6, #0 @ r6 = -ri0
MLA r12,r7, r11,r12 @ r12 += ri2*T[1]
CMP r4, r1
MUL r3, r7, r10 @ r3 = ri2*T[0]
STR r12,[r1,#8-16]
MLA r3, r6, r11,r3 @ r3 -= ri0*T[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}
RSBS r4,r3,#6 @ r4 = stages = 7-shift then --stages
LDR r5,=sincos_lookup0
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 @ 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
LDRB r8, [r5,#1] @ r8 = T[1]
LDRB r10,[r5],r6 @ r10= T[0] T += step
MOV r2, r2, ASR #8
MOV r11,r11,ASR #8
MOV r9, r9, ASR #8
MOV r14,r14,ASR #8
@ 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
MUL r3, r2, r8 @ r3 = s0*T[1]
MLA r3, r11,r10,r3 @ r3 += s1*T[0]
RSB r11,r11,#0
MUL r4, r8, r11 @ r4 = -s1*T[1]
MLA r4, r2, r10,r4 @ r4 += s0*T[0] = Value for x2[2]
MOV r2, r3 @ r2 = r3 = 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
MUL r3, r9, r10 @ r3 = s2*T[0]
MLA r3, r14,r8, r3 @ r3 += s3*T[1] = Value for x2[1]
RSB r9, r9, #0
MUL r11,r14,r10 @ r11 = s3*T[0]
MLA r11,r9, r8, r11 @ r11 -= s2*T[1] = Value for x2[3]
CMP r5, r12
STMIA r1,{r2,r3,r4,r11}
BLT mdct_bufferfly_generic_loop1
SUB r12,r12,#1024
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
LDRB r8, [r5,#1] @ r8 = T[1]
LDRB r10,[r5],-r6 @ r10= T[0] T -= step
MOV r2, r2, ASR #8
MOV r9, r9, ASR #8
MOV r4, r4, ASR #8
MOV r14,r14,ASR #8
@ 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
MUL r11,r2, r8 @ r11 = s0*T[1]
MLA r11,r9, r10,r11 @ r11 += s1*T[0]
RSB r9, r9, #0
MUL r2, r10,r2 @ r2 = s0*T[0]
MLA r2, r9, r8, r2 @ r2 += -s1*T[1] = Value for x2[0]
MOV r9, r11 @ r9 = r11 = 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
MUL r11,r4, r10 @ r11 = s2*T[0]
MLA r11,r14,r8, r11 @ r11 += s3*T[1] = Value for x2[3]
RSB r4, r4, #0
MUL r3, r14,r10 @ r3 = s3*T[0]
MLA r3, r4, r8, r3 @ r3 -= s2*T[1] = Value for x2[1]
CMP r5, r12
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}
MOV r6,#0xed @ r6 =cPI1_8
MOV r7,#0x62 @ r7 =cPI3_8
MOV r5, r5, ASR #8
MOV r9, r9, ASR #8
MOV r8, r8, ASR #8
MOV r12,r12,ASR #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
MUL r11,r5, r6 @ r11 = s0*cPI1_8
MLA r11,r9, r7, r11 @ r11 += s1*cPI3_8
RSB r9, r9, #0
MUL r5, r7, r5 @ r5 = s0*cPI3_8
MLA r5, r9, r6, r5 @ r5 -= s1*cPI1_8
@ 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
MUL r9, r8, r6 @ r9 = s2*cPI1_8
MLA r9, r12,r7, r9 @ r9 += s3*cPI3_8
RSB r8,r8,#0
MUL r12,r6, r12 @ r12 = s3*cPI1_8
MLA r12,r8, r7, r12 @ r12 -= s2*cPI3_8
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]
MOV r14,#0xb5 @ cPI2_8
STMIA r4!,{r6,r7,r10,r11}
SUB r5, r5, r9 @ r5 = s0 - s1
ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1
MOV r5, r5, ASR #8
MUL r5, r14,r5 @ r5 = (s0-s1)*cPI2_8
SUB r12,r12,r8 @ r12= s3 - s2
ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2
MOV r8, r8, ASR #8
MUL r8, r14,r8 @ r8 = (s3+s2)*cPI2_8
MOV r9, r9, ASR #8
MUL r9, r14,r9 @ r9 = (s0+s1)*cPI2_8
MOV r12,r12,ASR #8
MUL r12,r14,r12 @ r12 = (s3-s2)*cPI2_8
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}
MOV r6,#0x62 @ r6 = cPI3_8
MOV r7,#0xED @ 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
MOV r5, r5, ASR #8
MUL r11,r5, r6 @ r11 = s0*cPI3_8
MOV r9, r9, ASR #8
MLA r11,r9, r7, r11 @ r11 += s1*cPI1_8
RSB r9, r9, #0
MUL r5, r7, r5 @ r5 = s0*cPI1_8
MLA r5, r9, r6, r5 @ r5 -= s1*cPI3_8
@ 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
MOV r8, r8, ASR #8
MUL r9, r8, r6 @ r9 = s2*cPI3_8
MOV r12,r12,ASR #8
MLA r9, r12,r7, r9 @ r9 += s3*cPI1_8
RSB r8,r8,#0
MUL r12,r6, r12 @ r12 = s3*cPI3_8
MLA r12,r8, r7, r12 @ r12 -= s2*cPI1_8
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]
MOV r14,#0xB5 @ 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
MOV r5, r5, ASR #8
MUL r5, r14,r5 @ r5 = (s0-s1)*cPI2_8
SUB r12,r12,r8 @ r12= s3 - s2
ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2
MOV r8, r8, ASR #8
MUL r8, r14,r8 @ r8 = (s3+s2)*cPI2_8
MOV r9, r9, ASR #8
MUL r9, r14,r9 @ r9 = (s0+s1)*cPI2_8
MOV r12,r12,ASR #8
MUL r12,r14,r12 @ r12 = (s3-s2)*cPI2_8
STMIA r1!,{r5,r8,r9,r12}
@ block2
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}
@ mdct_butterfly16 (2nd version)
@ block 1
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]
MOV r14,#0xb5 @ 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
MOV r5, r5, ASR #8
MUL r5, r14,r5 @ r5 = (s0-s1)*cPI2_8
SUB r12,r12,r8 @ r12= s3 - s2
ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2
MOV r8, r8, ASR #8
MUL r8, r14,r8 @ r8 = (s3+s2)*cPI2_8
MOV r9, r9, ASR #8
MUL r9, r14,r9 @ r9 = (s0+s1)*cPI2_8
MOV r12,r12,ASR #8
MUL r12,r14,r12 @ r12 = (s3-s2)*cPI2_8
STMIA r1!,{r5,r8,r9,r12}
@ block2
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
@ 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 r3, r3, #2 @ r3 = shift -= 2
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]
ADD r9, r1, r7, LSR r3 @ 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-2
CMP r2, #4 @ r5 = T = (step>=4) ?
LDRGE r5, =sincos_lookup0 @ sincos_lookup0 +
LDRLT r5, =sincos_lookup1 @ sincos_lookup0 +
ADD r7, r1, r0, LSL #1 @ r7 = w1 = x + (n>>1)
ADDGE r5, r5, r2, LSR #1 @ (step>>1)
ADD r8, r5, #1024 @ 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]
LDRB r14,[r5,#1] @ r14= T[1]
LDRB r12,[r5],r2 @ 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]
MOV r6, r6, ASR #9
MUL r3, r6, r14 @ r3 = s0*T[1]
MOV r11,r11,ASR #9
MUL r4, r11,r12 @ r4 += s1*T[0] = s2
ADD r3, r3, r4
MUL r14,r11,r14 @ r14 = s1*T[1]
MUL r12,r6, r12 @ 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]
LDRB r14,[r5,-r2]! @ r12= T[1] T -= step
LDRB r12,[r5,#1] @ 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]
MOV r6, r6, ASR #9
MUL r3, r6, r14 @ r3 = s0*T[0]
MOV r11,r11,ASR #9
MUL r4, r11,r12 @ r4 += s1*T[1] = s2
ADD r3, r3, r4
MUL r14,r11,r14 @ r14 = s1*T[0]
MUL r12,r6, r12 @ 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) ?
LDRGE r5, =sincos_lookup0 @ sincos_lookup0 +
LDRLT r5, =sincos_lookup1 @ sincos_lookup1
ADD r7, r1, r0, LSL #1 @ r7 = iX = x + (n>>1)
ADDGE r5, r5, r2, LSR #1 @ (step>>1)
mdct_step8_default:
LDR r6, [r1],#4 @ r6 = s0 = x[0]
LDR r8, [r1],#4 @ r8 = -s1 = x[1]
LDRB r12,[r5,#1] @ r12= T[1]
LDRB r14,[r5],r2 @ 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]
MOV r6, r6, ASR #8
MOV r8, r8, ASR #8
MUL r10,r8, r12 @ r10 = s1 * T[1]
CMP r1, r7
MLA r10,r6, r14,r10 @ r10 += s0 * T[0]
RSB r6, r6, #0 @ r6 = -s0
MUL r11,r8, r14 @ r11 = s1 * T[0]
MLA r11,r6, r12,r11 @ r11 -= s0 * T[1]
STR r10,[r1,#-8]
STR r11,[r1,#-4]
BLT mdct_step8_default
mdct_end:
MOV r0, r2
LDMFD r13!,{r4-r11,PC}
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
@ END