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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2013 Michael Sevakis (jhMikeS)
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#if !SPC_NOINTERP
#define SPC_GAUSSIAN_FAST_INTERP
static inline int gaussian_fast_interp( int16_t const* samples,
int32_t position,
int16_t const* fwd,
int16_t const* rev )
{
int output;
int t0, t1, t2, t3;
asm volatile (
"ldrh %[t0], [%[samp]] \n" /* t0=s0 */
"ldrh %[t2], [%[fwd]] \n" /* t2=f0 */
"ldrh %[t1], [%[samp], #2] \n" /* t1=s1 */
"ldrh %[t3], [%[fwd], #2] \n" /* r3=f1 */
"smulbb %[out], %[t0], %[t2] \n" /* out=s0*f0 */
"ldrh %[t2], [%[rev], #2] \n" /* r2=r1 */
"ldrh %[t0], [%[samp], #4] \n" /* t0=s2 */
"smlabb %[out], %[t1], %[t3], %[out] \n" /* out+=s1*f1 */
"ldrh %[t3], [%[rev]] \n" /* t3=r0 */
"ldrh %[t1], [%[samp], #6] \n" /* t1=s3 */
"smlabb %[out], %[t0], %[t2], %[out] \n" /* out+=s2*r1 */
"smlabb %[out], %[t1], %[t3], %[out] \n" /* out+=s3*r0 */
: [out]"=&r"(output),
[t0]"=&r"(t0), [t1]"=&r"(t1), [t2]"=&r"(t2), [t3]"=&r"(t3)
: [fwd]"r"(fwd), [rev]"r"(rev),
[samp]"r"(samples + (position >> 12)));
return output;
}
#define SPC_GAUSSIAN_FAST_AMP
static inline int gaussian_fast_amp( struct voice_t* voice, int output,
int* amp_0, int* amp_1 )
{
asm volatile (
"mov %[out], %[out], asr #15 \n"
"smulbb %[out], %[out], %[envx] \n"
: [out]"+r"(output)
: [envx]"r"(voice->envx));
asm volatile (
"mov %[out], %[out], asr #11 \n"
"smulbb %[a0], %[out], %[v0] \n"
"smulbb %[a1], %[out], %[v1] \n"
: [out]"+r"(output),
[a0]"=&r"(*amp_0), [a1]"=r"(*amp_1)
: [v0]"r"(voice->volume [0]),
[v1]"r"(voice->volume [1]));
return output;
}
#define SPC_GAUSSIAN_SLOW_INTERP
static inline int gaussian_slow_interp( int16_t const* samples,
int32_t position,
int16_t const* fwd,
int16_t const* rev )
{
int output;
int t0, t1, t2, t3;
asm volatile (
"ldrsh %[t0], [%[samp]] \n" /* t0=s0 */
"ldrh %[t2], [%[fwd]] \n" /* t2=f0 */
"ldrsh %[t1], [%[samp], #2] \n" /* t1=s1 */
"ldrh %[t3], [%[fwd], #2] \n" /* t3=f1 */
"smulwb %[out], %[t0], %[t2] \n" /* out=s0*f0>>16 */
"ldrsh %[t0], [%[samp], #4] \n" /* t0=s2 */
"ldrh %[t2], [%[rev], #2] \n" /* t2=r1 */
"smlawb %[out], %[t1], %[t3], %[out] \n" /* out+=s1*f1>>16 */
"ldrsh %[t1], [%[samp], #6] \n" /* t1=s3 */
"ldrh %[t3], [%[rev]] \n" /* t3=r0 */
"smlawb %[out], %[t0], %[t2], %[out] \n" /* out+=s2*r1>>16 */
"smulwb %[t0], %[t1], %[t3] \n" /* t0=s3*r0>>16 */
"mov %[out], %[out], asl #17 \n" /* out=(int16_t)(out*2) */
"mov %[t0], %[t0], asl #1 \n" /* out+=t0*2 */
"add %[out], %[t0], %[out], asr #16 \n"
: [out]"=&r"(output),
[t0]"=&r"(t0), [t1]"=&r"(t1), [t2]"=&r"(t2), [t3]"=&r"(t3)
: [fwd]"r"(fwd), [rev]"r"(rev),
[samp]"r"(samples + (position >> 12)));
return CLAMP16( output );
}
#define SPC_GAUSSIAN_SLOW_AMP
static inline int gaussian_slow_amp( struct voice_t* voice, int output,
int* amp_0, int* amp_1 )
{
asm volatile (
"smulbb %[out], %[out], %[envx]"
: [out]"+r"(output)
: [envx]"r"(voice->envx));
asm volatile (
"mov %[out], %[out], asr #11 \n"
"bic %[out], %[out], #0x1 \n"
"smulbb %[a0], %[out], %[v0] \n"
"smulbb %[a1], %[out], %[v1] \n"
: [out]"+r"(output),
[a0]"=&r"(*amp_0), [a1]"=r"(*amp_1)
: [v0]"r"(voice->volume [0]), [v1]"r"(voice->volume [1]));
return output;
}
#endif /* !SPC_NOINTERP */
#if !SPC_NOECHO
#define SPC_DSP_ECHO_APPLY
/* Echo filter history */
static int32_t fir_buf[FIR_BUF_CNT] IBSS_ATTR_SPC
__attribute__(( aligned(FIR_BUF_ALIGN*1) ));
static inline void echo_init( struct Spc_Dsp* this )
{
this->fir.ptr = fir_buf;
ci->memset( fir_buf, 0, sizeof fir_buf );
}
static inline void echo_apply( struct Spc_Dsp* this, uint8_t *echo_ptr,
int* out_0, int* out_1 )
{
/* Keep last 8 samples */
int32_t* fir_ptr;
int t0;
asm volatile (
"ldr %[t0], [%[ep]] \n"
"add %[p], %[t_p], #4 \n"
"bic %[t_p], %[p], %[mask] \n"
"str %[t0], [%[p], #-4] \n"
/* duplicate at +8 eliminates wrap checking below */
"str %[t0], [%[p], #28] \n"
: [p]"=&r"(fir_ptr), [t_p]"+r"(this->fir.ptr),
[t0]"=&r"(t0)
: [ep]"r"(echo_ptr), [mask]"i"(~FIR_BUF_MASK));
int32_t* fir_coeff = (int32_t *)this->fir.coeff;
asm volatile (
"ldmia %[c]!, { r0-r1 } \n" /* C0C1-C2C3 = r0-r1 */
"ldmia %[p]!, { r2-r5 } \n" /* L1R1-L4R4 = r2-r5 */
"smulbb %[acc0], %[t0], r0 \n" /* acc0 = L0*C0 */
"smultb %[acc1], %[t0], r0 \n" /* acc1 = R0*C0 */
"smlabt %[acc0], r2, r0, %[acc0] \n" /* acc0 += L1*C1 */
"smlatt %[acc1], r2, r0, %[acc1] \n" /* acc1 += R1*C1 */
"smlabb %[acc0], r3, r1, %[acc0] \n" /* acc0 += L2*C2 */
"smlatb %[acc1], r3, r1, %[acc1] \n" /* acc1 += R2*C2 */
"smlabt %[acc0], r4, r1, %[acc0] \n" /* acc0 += L3*C3 */
"smlatt %[acc1], r4, r1, %[acc1] \n" /* acc1 += R3*C3 */
"ldmia %[c], { r0-r1 } \n" /* C4C5-C6C7 = r0-r1 */
"ldmia %[p], { r2-r4 } \n" /* L5R5-L7R7 = r2-r5 */
"smlabb %[acc0], r5, r0, %[acc0] \n" /* acc0 += L4*C4 */
"smlatb %[acc1], r5, r0, %[acc1] \n" /* acc1 += R4*C4 */
"smlabt %[acc0], r2, r0, %[acc0] \n" /* acc0 += L5*C5 */
"smlatt %[acc1], r2, r0, %[acc1] \n" /* acc1 += R5*C5 */
"smlabb %[acc0], r3, r1, %[acc0] \n" /* acc0 += L6*C6 */
"smlatb %[acc1], r3, r1, %[acc1] \n" /* acc1 += R6*C6 */
"smlabt %[acc0], r4, r1, %[acc0] \n" /* acc0 += L7*C7 */
"smlatt %[acc1], r4, r1, %[acc1] \n" /* acc1 += R7*C7 */
: [t0]"+r"(t0), [acc0]"=&r"(*out_0), [acc1]"=&r"(*out_1),
[p]"+r"(fir_ptr), [c]"+r"(fir_coeff)
:
: "r0", "r1", "r2", "r3", "r4", "r5");
}
#define SPC_DSP_ECHO_FEEDBACK
static inline void echo_feedback(struct Spc_Dsp* this, uint8_t* echo_ptr,
int echo_0, int echo_1, int fb_0, int fb_1)
{
int e0, e1;
asm volatile (
"mov %[e0], %[ei0], asl #7 \n"
"mov %[e1], %[ei1], asl #7 \n"
"mla %[e0], %[fb0], %[ef], %[e0] \n"
"mla %[e1], %[fb1], %[ef], %[e1] \n"
: [e0]"=&r"(e0), [e1]"=&r"(e1)
: [ei0]"r"(echo_0), [ei1]"r"(echo_1),
[fb0]"r"(fb_0), [fb1]"r"(fb_1),
[ef]"r"((int)this->r.g.echo_feedback));
e0 = CLAMP16( e0 >> 14 );
SET_LE16A( echo_ptr , e0 );
e1 = CLAMP16( e1 >> 14 );
SET_LE16A( echo_ptr + 2, e1 );
}
#define SPC_DSP_GENERATE_OUTPUT
static inline void echo_output( struct Spc_Dsp* this, int global_muting,
int global_vol_0, int global_vol_1, int chans_0, int chans_1,
int fb_0, int fb_1, int* out_0, int* out_1 )
{
int t0, t1;
asm volatile (
"mul %[t0], %[gv0], %[ch0] \n"
"mul %[t1], %[gv1], %[ch1] \n"
: [t0]"=&r"(t0), [t1]"=r"(t1)
: [gv0]"r"(global_vol_0), [gv1]"r"(global_vol_1),
[ch0]"r"(chans_0), [ch1]"r"(chans_1));
asm volatile (
"mla %[t0], %[i0], %[ev0], %[t0] \n"
"mla %[t1], %[i1], %[ev1], %[t1] \n"
: [t0]"+r"(t0), [t1]"+r"(t1)
: [i0]"r"(fb_0), [i1]"r"(fb_1),
[ev0]"r"((int)this->r.g.echo_volume_0),
[ev1]"r"((int)this->r.g.echo_volume_1));
asm volatile (
"mov %[o0], %[t0], asr %[gm] \n"
"mov %[o1], %[t1], asr %[gm] \n"
: [o0]"=&r"(*out_0), [o1]"=r"(*out_1)
: [t0]"r"(t0), [t1]"r"(t1),
[gm]"r"(global_muting));
}
#endif /* SPC_NOECHO */
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