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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id:
*
* Copyright (C) 2009 by Andree Buschmann
*
* 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.
*
****************************************************************************/
.section .text, "ax", %progbits
/****************************************************************************
* void atrac3_iqmf_matrixing(int32_t *dest,
* int32_t *inlo,
* int32_t *inhi,
* unsigned int count);
*
* Matrixing step within iqmf of atrac3 synthesis. Reference implementation:
*
* for(i=0; i<counter; i+=2){
* dest[2*i+0] = inlo[i ] + inhi[i ];
* dest[2*i+1] = inlo[i ] - inhi[i ];
* dest[2*i+2] = inlo[i+1] + inhi[i+1];
* dest[2*i+3] = inlo[i+1] - inhi[i+1];
* }
* Note: r12 is a scratch register and can be used without restorage.
****************************************************************************/
.align 2
.global atrac3_iqmf_matrixing
.type atrac3_iqmf_matrixing, %function
atrac3_iqmf_matrixing:
/* r0 = dest */
/* r1 = inlo */
/* r2 = inhi */
/* r3 = counter */
stmfd sp!, {r4-r9, lr} /* save non-scratch registers */
.iqmf_matrixing_loop:
ldmia r1!, { r4, r6, r8, r12} /* load inlo[0...3] */
ldmia r2!, { r5, r7, r9, lr } /* load inhi[0...3] */
add r4, r4, r5 /* r4 = inlo[0] + inhi[0] */
sub r5, r4, r5, asl #1 /* r5 = inlo[0] - inhi[0] */
add r6, r6, r7 /* r6 = inlo[1] + inhi[1] */
sub r7, r6, r7, asl #1 /* r7 = inlo[1] - inhi[1] */
add r8, r8, r9 /* r8 = inlo[2] + inhi[2] */
sub r9, r8, r9, asl #1 /* r9 = inlo[2] - inhi[2] */
add r12, r12, lr /* r12 = inlo[3] + inhi[3] */
sub lr , r12, lr, asl #1 /* lr = inlo[3] - inhi[3] */
stmia r0!, {r4-r9, r12, lr} /* store results to dest */
subs r3, r3, #4 /* counter -= 4 */
bgt .iqmf_matrixing_loop
ldmfd sp!, {r4-r9, pc} /* restore registers */
.atrac3_iqmf_matrixing_end:
.size atrac3_iqmf_matrixing,.atrac3_iqmf_matrixing_end-atrac3_iqmf_matrixing
/****************************************************************************
* atrac3_iqmf_dewindowing(int32_t *out,
* int32_t *in,
* int32_t *win,
* unsigned int nIn);
*
* Dewindowing step within iqmf of atrac3 synthesis. Reference implementation:
*
* for (j = nIn; j != 0; j--) {
* s1 = fixmul32(in[0], win[0]);
* s2 = fixmul32(in[1], win[1]);
* for (i = 2; i < 48; i += 2) {
* s1 += fixmul32(in[i ], win[i ]);
* s2 += fixmul32(in[i+1], win[i+1]);
* }
* out[0] = s2 << 1;
* out[1] = s1 << 1;
* in += 2;
* out += 2;
* }
* Note: r12 is a scratch register and can be used without restorage.
****************************************************************************/
.align 2
.global atrac3_iqmf_dewindowing
.type atrac3_iqmf_dewindowing, %function
atrac3_iqmf_dewindowing:
/* r0 = dest */
/* r1 = input samples */
/* r2 = window coefficients */
/* r3 = counter */
stmfd sp!, {r4-r10, lr} /* save non-scratch registers */
.iqmf_dewindow_outer_loop: /* outer loop 0...counter-1 */
ldmia r2!, {r5, r6} /* load win[0..1] */
ldmia r1!, {r7, r8} /* load in[0..1] */
smull lr , r10, r5, r7 /* s1 = win[0] * in[0] */
smull r12, r9 , r6, r8 /* s2 = win[1] * in[1] */
mov r4, #46 /* r4 = 46 */
.iqmf_dewindow_inner_loop: /* inner loop i=2...48 */
ldmia r2!, {r5, r6} /* load win[i...i+1] */
ldmia r1!, {r7, r8} /* load in[i...i+1] */
smlal lr , r10, r5, r7 /* s1 = win[i ] * in[i ] */
smlal r12, r9 , r6, r8 /* s2 = win[i+1] * in[i+1] */
subs r4, r4, #2 /* inner loop -= 2*/
bgt .iqmf_dewindow_inner_loop
mov lr , lr , lsr #31
orr r10, lr , r10, lsl #1 /* s1 = low>>31 || hi<<1 */
mov r12, r12, lsr #31
orr r9 , r12, r9 , lsl #1 /* s2 = low>>31 || hi<<1 */
stmia r0!, {r9, r10} /* store result out[0]=s2, out[1]=s1 */
sub r1, r1, #184 /* roll back 64 entries = 184 bytes */
sub r2, r2, #192 /* roll back 48 entries = 192 bytes = win[0] */
subs r3, r3, #1 /* outer loop -= 1 */
bgt .iqmf_dewindow_outer_loop
ldmfd sp!, {r4-r10, pc} /* restore registers */
.atrac3_iqmf_dewindowing_end:
.size atrac3_iqmf_dewindowing,.atrac3_iqmf_dewindowing_end-atrac3_iqmf_dewindowing
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