b397fe5ae3
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28666 a1c6a512-1295-4272-9138-f99709370657
265 lines
9.3 KiB
C
265 lines
9.3 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2005 by Pedro Vasconcelos
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/* asm routines for wide math on the MCF5249 */
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#include "os_types.h"
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#if defined(CPU_COLDFIRE)
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#ifndef _V_WIDE_MATH
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#define _V_WIDE_MATH
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#define MB()
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static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
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asm volatile ("mac.l %[x], %[y], %%acc0;" /* multiply & shift */
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"movclr.l %%acc0, %[x];" /* move & clear acc */
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"asr.l #1, %[x];" /* no overflow test */
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: [x] "+&d" (x)
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: [y] "r" (y)
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: "cc");
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return x;
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}
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static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
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asm volatile ("mac.l %[x], %[y], %%acc0;" /* multiply */
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"movclr.l %%acc0, %[x];" /* move and clear */
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: [x] "+&r" (x)
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: [y] "r" (y)
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: "cc");
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return x;
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}
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static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
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ogg_int32_t r;
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asm volatile ("mac.l %[x], %[y], %%acc0;" /* multiply */
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"mulu.l %[y], %[x];" /* get lower half, avoid emac stall */
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"movclr.l %%acc0, %[r];" /* get higher half */
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"swap %[r];" /* hi<<16, plus one free */
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"lsr.l #8, %[x];" /* (unsigned)lo >> 15 */
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"lsr.l #7, %[x];"
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"move.w %[x], %[r];" /* logical-or results */
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: [r] "=&d" (r), [x] "+d" (x)
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: [y] "d" (y)
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: "cc");
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return r;
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}
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#ifndef _V_VECT_OPS
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#define _V_VECT_OPS
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/* asm versions of vector operations for block.c, window.c */
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/* assumes MAC is initialized & accumulators cleared */
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static inline
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void vect_add_right_left(ogg_int32_t *x, const ogg_int32_t *y, int n)
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{
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/* align to 16 bytes */
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while(n>0 && (int)x&15) {
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*x++ += *y++;
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n--;
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}
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asm volatile ("bra 1f;"
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"0:" /* loop start */
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"movem.l (%[x]), %%d0-%%d3;" /* fetch values */
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"movem.l (%[y]), %%a0-%%a3;"
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/* add */
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"add.l %%a0, %%d0;"
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"add.l %%a1, %%d1;"
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"add.l %%a2, %%d2;"
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"add.l %%a3, %%d3;"
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/* store and advance */
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"movem.l %%d0-%%d3, (%[x]);"
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"lea.l (4*4, %[x]), %[x];"
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"lea.l (4*4, %[y]), %[y];"
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"subq.l #4, %[n];" /* done 4 elements */
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"1: cmpi.l #4, %[n];"
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"bge 0b;"
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: [n] "+d" (n), [x] "+a" (x), [y] "+a" (y)
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: : "%d0", "%d1", "%d2", "%d3", "%a0", "%a1", "%a2", "%a3",
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"cc", "memory");
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/* add final elements */
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while (n>0) {
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*x++ += *y++;
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n--;
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}
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}
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static inline
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void vect_add_left_right(ogg_int32_t *x, const ogg_int32_t *y, int n)
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{
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/* coldfire asm has symmetrical versions of vect_add_right_left
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and vect_add_left_right (since symmetrical versions of
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vect_mult_fw and vect_mult_bw i.e. both use MULT31) */
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vect_add_right_left(x, y, n );
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}
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static inline
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void vect_copy(ogg_int32_t *x, const ogg_int32_t *y, int n)
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{
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/* align to 16 bytes */
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while(n>0 && (int)x&15) {
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*x++ = *y++;
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n--;
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}
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asm volatile ("bra 1f;"
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"0:" /* loop start */
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"movem.l (%[y]), %%d0-%%d3;" /* fetch values */
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"movem.l %%d0-%%d3, (%[x]);" /* store */
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"lea.l (4*4, %[x]), %[x];" /* advance */
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"lea.l (4*4, %[y]), %[y];"
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"subq.l #4, %[n];" /* done 4 elements */
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"1: cmpi.l #4, %[n];"
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"bge 0b;"
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: [n] "+d" (n), [x] "+a" (x), [y] "+a" (y)
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: : "%d0", "%d1", "%d2", "%d3", "cc", "memory");
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/* copy final elements */
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while (n>0) {
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*x++ = *y++;
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n--;
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}
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}
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static inline
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void vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
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{
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/* ensure data is aligned to 16-bytes */
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while(n>0 && (int)data&15) {
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*data = MULT31(*data, *window);
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data++;
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window++;
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n--;
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}
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asm volatile ("movem.l (%[d]), %%d0-%%d3;" /* loop start */
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"movem.l (%[w]), %%a0-%%a3;" /* pre-fetch registers */
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"lea.l (4*4, %[w]), %[w];"
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"bra 1f;" /* jump to loop condition */
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"0:" /* loop body */
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/* multiply and load next window values */
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"mac.l %%d0, %%a0, (%[w])+, %%a0, %%acc0;"
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"mac.l %%d1, %%a1, (%[w])+, %%a1, %%acc1;"
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"mac.l %%d2, %%a2, (%[w])+, %%a2, %%acc2;"
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"mac.l %%d3, %%a3, (%[w])+, %%a3, %%acc3;"
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"movclr.l %%acc0, %%d0;" /* get the products */
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"movclr.l %%acc1, %%d1;"
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"movclr.l %%acc2, %%d2;"
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"movclr.l %%acc3, %%d3;"
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/* store and advance */
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"movem.l %%d0-%%d3, (%[d]);"
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"lea.l (4*4, %[d]), %[d];"
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"movem.l (%[d]), %%d0-%%d3;"
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"subq.l #4, %[n];" /* done 4 elements */
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"1: cmpi.l #4, %[n];"
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"bge 0b;"
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/* multiply final elements */
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"tst.l %[n];"
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"beq 1f;" /* n=0 */
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"mac.l %%d0, %%a0, %%acc0;"
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"movclr.l %%acc0, %%d0;"
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"move.l %%d0, (%[d])+;"
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"subq.l #1, %[n];"
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"beq 1f;" /* n=1 */
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"mac.l %%d1, %%a1, %%acc0;"
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"movclr.l %%acc0, %%d1;"
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"move.l %%d1, (%[d])+;"
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"subq.l #1, %[n];"
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"beq 1f;" /* n=2 */
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/* otherwise n = 3 */
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"mac.l %%d2, %%a2, %%acc0;"
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"movclr.l %%acc0, %%d2;"
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"move.l %%d2, (%[d])+;"
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"1:"
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: [n] "+d" (n), [d] "+a" (data), [w] "+a" (window)
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: : "%d0", "%d1", "%d2", "%d3", "%a0", "%a1", "%a2", "%a3",
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"cc", "memory");
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}
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static inline
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void vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
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{
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/* ensure at least data is aligned to 16-bytes */
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while(n>0 && (int)data&15) {
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*data = MULT31(*data, *window);
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data++;
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window--;
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n--;
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}
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asm volatile ("lea.l (-3*4, %[w]), %[w];" /* loop start */
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"movem.l (%[d]), %%d0-%%d3;" /* pre-fetch registers */
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"movem.l (%[w]), %%a0-%%a3;"
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"bra 1f;" /* jump to loop condition */
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"0:" /* loop body */
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/* multiply and load next window value */
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"mac.l %%d0, %%a3, -(%[w]), %%a3, %%acc0;"
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"mac.l %%d1, %%a2, -(%[w]), %%a2, %%acc1;"
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"mac.l %%d2, %%a1, -(%[w]), %%a1, %%acc2;"
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"mac.l %%d3, %%a0, -(%[w]), %%a0, %%acc3;"
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"movclr.l %%acc0, %%d0;" /* get the products */
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"movclr.l %%acc1, %%d1;"
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"movclr.l %%acc2, %%d2;"
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"movclr.l %%acc3, %%d3;"
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/* store and advance */
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"movem.l %%d0-%%d3, (%[d]);"
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"lea.l (4*4, %[d]), %[d];"
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"movem.l (%[d]), %%d0-%%d3;"
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"subq.l #4, %[n];" /* done 4 elements */
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"1: cmpi.l #4, %[n];"
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"bge 0b;"
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/* multiply final elements */
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"tst.l %[n];"
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"beq 1f;" /* n=0 */
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"mac.l %%d0, %%a3, %%acc0;"
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"movclr.l %%acc0, %%d0;"
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"move.l %%d0, (%[d])+;"
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"subq.l #1, %[n];"
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"beq 1f;" /* n=1 */
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"mac.l %%d1, %%a2, %%acc0;"
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"movclr.l %%acc0, %%d1;"
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"move.l %%d1, (%[d])+;"
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"subq.l #1, %[n];"
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"beq 1f;" /* n=2 */
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/* otherwise n = 3 */
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"mac.l %%d2, %%a1, %%acc0;"
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"movclr.l %%acc0, %%d2;"
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"move.l %%d2, (%[d])+;"
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"1:"
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: [n] "+d" (n), [d] "+a" (data), [w] "+a" (window)
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: : "%d0", "%d1", "%d2", "%d3", "%a0", "%a1", "%a2", "%a3",
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"cc", "memory");
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}
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#endif
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#endif
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/* not used anymore */
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/*
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#ifndef _V_CLIP_MATH
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#define _V_CLIP_MATH
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static inline ogg_int32_t CLIP_TO_15(register ogg_int32_t x) {
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register ogg_int32_t hi=32767, lo=-32768;
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return (x>=hi ? hi : (x<=lo ? lo : x));
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}
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#endif
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*/
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#endif
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