fabbeba59a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31054 a1c6a512-1295-4272-9138-f99709370657
231 lines
8.7 KiB
C
231 lines
8.7 KiB
C
/*
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Copyright (c) 2005, The Musepack Development Team
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of the The Musepack Development Team nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/// \file math.h
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/// Libmpcdec internal math routines.
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#ifndef _mpcdec_math_h_
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#define _mpcdec_math_h_
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#include "mpc_types.h"
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#define MPC_FIXED_POINT_SHIFT 16
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#ifdef MPC_FIXED_POINT
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#ifdef _WIN32_WCE
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#include <cmnintrin.h>
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#define MPC_HAVE_MULHIGH
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#endif
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typedef mpc_int64_t MPC_SAMPLE_FORMAT_MULTIPLY;
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#define MAKE_MPC_SAMPLE(X) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<MPC_FIXED_POINT_FRACTPART))
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#define MAKE_MPC_SAMPLE_EX(X,Y) (MPC_SAMPLE_FORMAT)((double)(X) * (double)(((mpc_int64_t)1)<<(Y)))
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#define MPC_SHR_RND(X, Y) ((X+(1<<(Y-1)))>>Y)
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#if defined(CPU_COLDFIRE)
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#define MPC_MULTIPLY(X,Y) mpc_multiply((X), (Y))
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#define MPC_MULTIPLY_EX(X,Y,Z) mpc_multiply_ex((X), (Y), (Z))
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static inline MPC_SAMPLE_FORMAT mpc_multiply(MPC_SAMPLE_FORMAT x,
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MPC_SAMPLE_FORMAT y)
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{
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MPC_SAMPLE_FORMAT t1, t2;
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asm volatile (
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"mac.l %[x],%[y],%%acc0\n" /* multiply */
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"mulu.l %[y],%[x] \n" /* get lower half, avoid emac stall */
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"movclr.l %%acc0,%[t1] \n" /* get higher half */
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"moveq.l #17,%[t2] \n"
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"asl.l %[t2],%[t1] \n" /* hi <<= 17, plus one free */
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"moveq.l #14,%[t2] \n"
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"lsr.l %[t2],%[x] \n" /* (unsigned)lo >>= 14 */
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"or.l %[x],%[t1] \n" /* combine result */
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: /* outputs */
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[t1]"=&d"(t1),
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[t2]"=&d"(t2),
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[x] "+d" (x)
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: /* inputs */
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[y] "d" (y)
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);
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return t1;
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}
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static inline MPC_SAMPLE_FORMAT mpc_multiply_ex(MPC_SAMPLE_FORMAT x,
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MPC_SAMPLE_FORMAT y,
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unsigned shift)
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{
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MPC_SAMPLE_FORMAT t1, t2;
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asm volatile (
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"mac.l %[x],%[y],%%acc0\n" /* multiply */
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"mulu.l %[y],%[x] \n" /* get lower half, avoid emac stall */
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"movclr.l %%acc0,%[t1] \n" /* get higher half */
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"moveq.l #31,%[t2] \n"
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"sub.l %[sh],%[t2] \n" /* t2 = 31 - shift */
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"ble.s 1f \n"
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"asl.l %[t2],%[t1] \n" /* hi <<= 31 - shift */
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"lsr.l %[sh],%[x] \n" /* (unsigned)lo >>= shift */
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"or.l %[x],%[t1] \n" /* combine result */
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"bra.s 2f \n"
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"1: \n"
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"neg.l %[t2] \n" /* t2 = shift - 31 */
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"asr.l %[t2],%[t1] \n" /* hi >>= t2 */
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"2: \n"
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: /* outputs */
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[t1]"=&d"(t1),
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[t2]"=&d"(t2),
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[x] "+d" (x)
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: /* inputs */
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[y] "d" (y),
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[sh]"d" (shift)
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);
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return t1;
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}
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#elif defined(CPU_ARM)
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/* Calculate: result = (X*Y)>>14 */
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#define MPC_MULTIPLY(X,Y) \
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({ \
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MPC_SAMPLE_FORMAT lo; \
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MPC_SAMPLE_FORMAT hi; \
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asm volatile ( \
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"smull %[lo], %[hi], %[x], %[y] \n\t" /* multiply */ \
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"mov %[lo], %[lo], lsr #14 \n\t" /* lo >>= 14 */ \
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"orr %[lo], %[lo], %[hi], lsl #18" /* lo |= (hi << 18) */ \
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: [lo]"=&r"(lo), [hi]"=&r"(hi) \
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: [x]"r"(X), [y]"r"(Y)); \
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lo; \
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})
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/* Calculate: result = (X*Y)>>Z */
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#define MPC_MULTIPLY_EX(X,Y,Z) \
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({ \
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MPC_SAMPLE_FORMAT lo; \
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MPC_SAMPLE_FORMAT hi; \
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asm volatile ( \
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"smull %[lo], %[hi], %[x], %[y] \n\t" /* multiply */ \
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"mov %[lo], %[lo], lsr %[shr] \n\t" /* lo >>= Z */ \
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"orr %[lo], %[lo], %[hi], lsl %[shl]" /* lo |= (hi << (32-Z)) */ \
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: [lo]"=&r"(lo), [hi]"=&r"(hi) \
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: [x]"r"(X), [y]"r"(Y), [shr]"r"(Z), [shl]"r"(32-Z)); \
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lo; \
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})
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#else /* libmusepack standard */
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#define MPC_MULTIPLY_NOTRUNCATE(X,Y) \
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(((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> MPC_FIXED_POINT_FRACTPART)
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#define MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z) \
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(((MPC_SAMPLE_FORMAT_MULTIPLY)(X) * (MPC_SAMPLE_FORMAT_MULTIPLY)(Y)) >> (Z))
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#ifdef _DEBUG
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static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2)
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{
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MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_NOTRUNCATE(item1,item2);
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assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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return (MPC_SAMPLE_FORMAT)temp;
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}
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static inline MPC_SAMPLE_FORMAT MPC_MULTIPLY_EX(MPC_SAMPLE_FORMAT item1,MPC_SAMPLE_FORMAT item2,unsigned shift)
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{
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MPC_SAMPLE_FORMAT_MULTIPLY temp = MPC_MULTIPLY_EX_NOTRUNCATE(item1,item2,shift);
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assert(temp == (MPC_SAMPLE_FORMAT_MULTIPLY)(MPC_SAMPLE_FORMAT)temp);
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return (MPC_SAMPLE_FORMAT)temp;
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}
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#else
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#define MPC_MULTIPLY(X,Y) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_NOTRUNCATE(X,Y))
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#define MPC_MULTIPLY_EX(X,Y,Z) ((MPC_SAMPLE_FORMAT)MPC_MULTIPLY_EX_NOTRUNCATE(X,Y,Z))
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#endif
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#endif
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#ifdef MPC_HAVE_MULHIGH
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#define MPC_MULTIPLY_FRACT(X,Y) _MulHigh(X,Y)
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#else
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#if defined(CPU_COLDFIRE)
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/* loses one bit of accuracy. The rest of the macros won't be as easy as this... */
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#define MPC_MULTIPLY_FRACT(X,Y) \
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({ \
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MPC_SAMPLE_FORMAT t; \
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asm volatile ( \
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"mac.l %[A], %[B], %%acc0\n\t" \
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"movclr.l %%acc0, %[t] \n\t" \
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"asr.l #1, %[t] \n\t" \
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: [t] "=d" (t) \
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: [A] "r" ((X)), [B] "r" ((Y))); \
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t; \
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})
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#elif defined(CPU_ARM)
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/* Calculate: result = (X*Y)>>32, without need for >>32 */
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#define MPC_MULTIPLY_FRACT(X,Y) \
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({ \
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MPC_SAMPLE_FORMAT lo; \
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MPC_SAMPLE_FORMAT hi; \
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asm volatile ( \
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"smull %[lo], %[hi], %[x], %[y]" /* hi = result */ \
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: [lo]"=&r"(lo), [hi]"=&r"(hi) \
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: [x]"r"(X), [y]"r"(Y)); \
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hi; \
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})
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#else
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#define MPC_MULTIPLY_FRACT(X,Y) MPC_MULTIPLY_EX(X,Y,32)
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#endif
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#endif
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#define MPC_MAKE_FRACT_CONST(X) (MPC_SAMPLE_FORMAT)((X) * (double)(((mpc_int64_t)1)<<32) )
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#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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#else
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//in floating-point mode, decoded samples are in -1...1 range
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typedef float MPC_SAMPLE_FORMAT;
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#define MAKE_MPC_SAMPLE(X) ((MPC_SAMPLE_FORMAT)(X))
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#define MAKE_MPC_SAMPLE_EX(X,Y) ((MPC_SAMPLE_FORMAT)(X))
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#define MPC_MULTIPLY_FRACT(X,Y) ((X)*(Y))
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#define MPC_MAKE_FRACT_CONST(X) (X)
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#define MPC_MULTIPLY_FLOAT_INT(X,Y) ((X)*(Y))
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#define MPC_MULTIPLY(X,Y) ((X)*(Y))
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#define MPC_MULTIPLY_EX(X,Y,Z) ((X)*(Y))
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#define MPC_SHR_RND(X, Y) (X)
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#endif
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#endif // _mpcdec_math_h_
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