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/* Copyright (C) 2007 Thom Johansen */
/**
@file filters_cf.S
@brief Various analysis/synthesis filters (Coldfire version)
*/
/*
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 name of the Xiph.org Foundation 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 FOUNDATION 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
/* void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack) */
.global iir_mem16
iir_mem16:
lea.l (-44, %sp), %sp
movem.l %d2-%d7/%a2-%a6, (%sp)
movem.l (44+4, %sp), %a3-%a5 | a3 = x, a4 = den, a5 = y
movem.l (44+20, %sp), %d0/%a6 | d0 = ord, a6 = mem
moveq.l #8, %d1 | Jump to correct routine based on 'ord'
cmp.l %d1, %d0
jeq .order_8
moveq.l #10, %d1
cmp.l %d1, %d0
jeq .order_10
jra .exit
| d0 = y[i], d1-d7, a0 = mem[0] .. mem[7]
| a3 = x, a4 = den, a5 = y, a6 = temp
.order_8:
movem.l (%a6), %d1-%d7/%a0 | Fetch mem[] array
0:
moveq.l #13, %d0
add.l #4096, %d1
asr.l %d0, %d1 | mem[0] >> 13 with rounding
move.w (%a3)+, %d0
ext.l %d0
add.l %d1, %d0 | Add with x[i]
move.l #32767, %d1
move.l #65534, %a6
add.l %d1, %d0 | Bias result to [-1..65534]
cmp.l %a6, %d0 | Now do clip to [0..65534] range
jls 2f
jpl 1f
clr.l %d0 | Clip low
.word 0x51fa | trapf.w, shadow next insn
1:
move.l %a6, %d0 | Clip high
2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767]
move.w %d0, (%a5)+ | Write result to y[i]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
mac.w %a6u, %d0l, %acc2
mac.w %a6l, %d0l, (%a4)+, %a6, %acc3
movclr.l %acc0, %d1
add.l %d2, %d1 | mem[0] = mem[1] - den[0]*y[i]
movclr.l %acc1, %d2
add.l %d3, %d2 | mem[1] = mem[2] - den[1]*y[i]
movclr.l %acc2, %d3
add.l %d4, %d3 | mem[2] = mem[3] - den[2]*y[i]
movclr.l %acc3, %d4
add.l %d5, %d4 | mem[3] = mem[4] - den[3]*y[i]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
mac.w %a6u, %d0l, %acc2
mac.w %a6l, %d0l, %acc3
lea.l (-16, %a4), %a4 | wrap den pointer back to den[0]
movclr.l %acc0, %d5
add.l %d6, %d5 | mem[4] = mem[5] - den[4]*y[i]
movclr.l %acc1, %d6
add.l %d7, %d6 | mem[5] = mem[6] - den[5]*y[i]
movclr.l %acc2, %d7
add.l %a0, %d7 | mem[6] = mem[7] - den[6]*y[i]
movclr.l %acc3, %a0 | mem[7] = -den[7]*y[i]
subq.l #1, (44+16, %sp) | Have we done all samples?
jne 0b
move.l (44+24, %sp), %a6 | Fetch mem pointer
movem.l %d1-%d7/%a0, (%a6) | Save back mem[]
jra .exit
| d0 = y[i], d1-d7, a0-a2 = mem[0] .. mem[9]
| a3 = x, a4 = den, a5 = y, a6 = temp
.order_10:
movem.l (%a6), %d1-%d7/%a0-%a2 | Fetch mem[] array
0:
moveq.l #13, %d0
add.l #4096, %d1
asr.l %d0, %d1 | mem[0] >> 13 with rounding
move.w (%a3)+, %d0
ext.l %d0
add.l %d1, %d0 | Add with x[i]
move.l #32767, %d1
move.l #65534, %a6
add.l %d1, %d0 | Bias result to [-1..65534]
cmp.l %a6, %d0 | Now do clip to [0..65534] range
jls 2f
jpl 1f
clr.l %d0 | Clip low
.word 0x51fa | trapf.w, shadow next insn
1:
move.l %a6, %d0 | Clip high
2:
sub.l %d1, %d0 | Bias clipped result back to [-32767..32767]
move.w %d0, (%a5)+ | Write result to y[i]
neg.l %d0 | msac.w is bugged in gas, do this for now
move.l (%a4)+, %a6 | Fetch den[0] and den[1]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
mac.w %a6u, %d0l, %acc2
mac.w %a6l, %d0l, (%a4)+, %a6, %acc3
movclr.l %acc0, %d1
add.l %d2, %d1 | mem[0] = mem[1] - den[0]*y[i]
movclr.l %acc1, %d2
add.l %d3, %d2 | mem[1] = mem[2] - den[1]*y[i]
movclr.l %acc2, %d3
add.l %d4, %d3 | mem[2] = mem[3] - den[2]*y[i]
movclr.l %acc3, %d4
add.l %d5, %d4 | mem[3] = mem[4] - den[3]*y[i]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, (%a4)+, %a6, %acc1
mac.w %a6u, %d0l, %acc2
mac.w %a6l, %d0l, (%a4)+, %a6, %acc3
lea.l (-20, %a4), %a4 | wrap den pointer back to den[0]
movclr.l %acc0, %d5
add.l %d6, %d5 | mem[4] = mem[5] - den[4]*y[i]
movclr.l %acc1, %d6
add.l %d7, %d6 | mem[5] = mem[6] - den[5]*y[i]
movclr.l %acc2, %d7
add.l %a0, %d7 | mem[6] = mem[7] - den[6]*y[i]
movclr.l %acc3, %a0
add.l %a1, %a0 | mem[7] = mem[8] - den[7]*y[i]
mac.w %a6u, %d0l, %acc0
mac.w %a6l, %d0l, %acc1
movclr.l %acc0, %a1
add.l %a2, %a1 | mem[8] = mem[9] - den[8]*y[i]
movclr.l %acc1, %a2 | mem[9] = -den[9]*y[i]
subq.l #1, (44+16, %sp) | Have we done all samples?
jne 0b
move.l (44+24, %sp), %a6 | Fetch mem pointer
movem.l %d1-%d7/%a0-%a2, (%a6) | Save back mem[]
.exit:
movem.l (%sp), %d2-%d7/%a2-%a6
lea.l (44, %sp), %sp
rts
/* void qmf_synth(const spx_word16_t *x1, const spx_word16_t *x2, const spx_word16_t *a, spx_word16_t *y, int N, int M, spx_word32_t *mem1, spx_word32_t *mem2, char *stack) */
.global qmf_synth
qmf_synth:
lea.l (-44, %sp), %sp
movem.l %d2-%d7/%a2-%a6, (%sp)
movem.l (44+4, %sp), %a0-%a3 | a0 = x1, a1 = x2, a2 = a, a3 = y
movem.l (44+20, %sp), %d0-%d1/%a4-%a5 | d0 = N, d1 = M, a4 = mem1,a5 = mem2
move.l #0x80, %macsr | Enable saturation
| Comments make more sense when compared to the reference C version
move.l %a2, %d6 | Backup a
lsr.l #1, %d0 | N2 = N >> 1
lsr.l #1, %d1 | M2 = M >> 1
move.l %d1, %d7 | Backup M2
clr.l %d2
sub.l %d0, %d2
sub.l %d1, %d2 | d2 = -(N2 + M2)
lea.l (%sp, %d2.l*2), %a2 | Alloc two buffers of N2 + M2 shorts
lea.l (%a2, %d2.l*2), %a6 | a2 = xx1, a6 = xx2
move.l %sp, %d3
move.l %a6, %sp | Update sp
move.l %d3, -(%sp) | Stack old %sp
| Backwards copy x1 and x2 arrays to xx1 and xx2
| TODO: these copying loops probably have more potential for optimization
lea.l (%a0, %d0.l*2), %a0 | x1 += N2
lea.l (%a1, %d0.l*2), %a1 | x2 += N2
move.l %d0, %d2 | Loop counter is N2
0:
move.w -(%a0), (%a2)+
move.w -(%a1), (%a6)+
subq.l #1, %d2
jne 0b
| Copy alternate members of mem1 and mem2 to last part of xx1 and xx2
move.l %d1, %d2 | Loop counter is M2
addq.l #4, %a4 | a4 = &mem1[1]
addq.l #4, %a5 | a5 = &mem2[1]
move.l %a4, %d3 | Backup mem1 and mem2
move.l %a5, %d4
0:
move.l (%a4), %d5
move.w %d5, (%a2)+
move.l (%a5), %d5
move.w %d5, (%a6)+
addq.l #8, %a4
addq.l #8, %a5
subq.l #1, %d2
jne 0b
move.l %d3, %a4 | a4 = &mem1[1]
move.l %d4, %a5 | a5 = &mem2[1]
clr.l %d2
sub.l %d1, %d2 | d2 = -M2
lea.l (-4, %a2, %d2.l*2), %a0 | a0 = &xx1[N2 - 2]
lea.l (-4, %a6, %d2.l*2), %a1 | a1 = &xx2[N2 - 2]
move.l %d6, %a2 | a2 = a
| Main loop, register usage:
| d0 = N2 counter, d1 = M2 counter, d7 = M2 backup
| d2 = x10, d3 = x11, d4 = x20, d5 = x21, d6 = [a0, a1]
| a0 = xx1, a1 = xx2, a2 = a, a3 = y, a4 = mem1, a5 = mem2
0: | Outerloop
move.l #32768, %d2 | Rounding constant
move.l %d2, %acc0
move.l %d2, %acc1
move.l %d2, %acc2
move.l %d2, %acc3
move.w (%a0)+, %d2 | d2 = x10
move.w (%a1)+, %d4 | d4 = x20
move.l (%a2)+, %d6 | d6 = [a0, a1]
1: | Innerloop
move.w (%a0)+, %d3 | d3 = x11
move.w (%a1)+, %d5 | d5 = x21
mac.w %d6u, %d3l, #1, %acc0 | acc0 += a0*x11
msac.w %d6u, %d5l, #1, %acc0 | acc0 -= a0*x21
mac.w %d6l, %d3l, #1, %acc1 | acc1 += a1*x11
mac.w %d6l, %d5l, #1, %acc1 | acc1 += a1*x21
mac.w %d6u, %d2l, #1, %acc2 | acc2 += a0*x10
msac.w %d6u, %d4l, #1, %acc2 | acc2 -= a0*x20
mac.w %d6l, %d2l, #1, %acc3 | acc3 += a1*x10
mac.w %d6l, %d4l, #1, (%a2)+, %d6, %acc3 | acc3 += a1*x20
move.w (%a0)+, %d2 | d2 = x10
move.w (%a1)+, %d4 | d4 = x20
mac.w %d6u, %d2l, #1, %acc0 | acc0 += a0*x10
msac.w %d6u, %d4l, #1, %acc0 | acc0 -= a0*x20
mac.w %d6l, %d2l, #1, %acc1 | acc1 += a1*x10
mac.w %d6l, %d4l, #1, %acc1 | acc1 += a1*x20
mac.w %d6u, %d3l, #1, %acc2 | acc2 += a0*x11
msac.w %d6u, %d5l, #1, %acc2 | acc2 -= a0*x21
mac.w %d6l, %d3l, #1, %acc3 | acc3 += a1*x11
mac.w %d6l, %d5l, #1, (%a2)+, %d6, %acc3 | acc3 += a1*x21
subq.l #2, %d1
jne 1b
sub.l %d7, %d1 | d1 = -M2
lea.l (-4, %a2, %d1.l*4), %a2 | a2 = &a[0]
lea.l (-6, %a0, %d1.l*2), %a0 | a0 = &xx1[N2 - 2 - i]
lea.l (-6, %a1, %d1.l*2), %a1 | a1 = &xx2[N2 - 2 - i]
neg.l %d1 | d1 = M2
movclr.l %acc0, %d2
movclr.l %acc1, %d3
movclr.l %acc2, %d4
movclr.l %acc3, %d5
swap.w %d2 | Shift 16 right
swap.w %d3
swap.w %d4
swap.w %d5
| Thanks to the extra shift in the mac chain, we get clipping for free.
| The clipping will be [-32768..32767], not Speex standard [-32767..32767],
| but since qmf_synth() is called so late in the signal chain, it should
| work fine.
move.w %d2, (%a3)+ | Write results to y[]
move.w %d3, (%a3)+
move.w %d4, (%a3)+
move.w %d5, (%a3)+
subq.l #2, %d0
jne 0b
| Copy start of xx1 and xx2 back to alternate mem1 and mem2 entries
addq.l #4, %a0 | a0 = &xx1[0]
addq.l #4, %a1 | a1 = &xx2[0]
0:
move.w (%a0)+, %d2
move.w (%a1)+, %d3
ext.l %d2
ext.l %d3
move.l %d2, (%a4)
move.l %d3, (%a5)
addq.l #8, %a4
addq.l #8, %a5
subq.l #1, %d1
jne 0b
move.l #0, %macsr
move.l (%sp), %sp
movem.l (%sp), %d2-%d7/%a2-%a6
lea.l (44, %sp), %sp
rts
|
