mirror of
https://github.com/cookiengineer/audacity
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500 lines
13 KiB
C
500 lines
13 KiB
C
/*
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* libmad - MPEG audio decoder library
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* Copyright (C) 2000-2004 Underbit Technologies, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: fixed.h,v 1.3 2008-02-02 11:37:37 richardash1981 Exp $
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*/
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# ifndef LIBMAD_FIXED_H
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# define LIBMAD_FIXED_H
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# if SIZEOF_INT >= 4
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typedef signed int mad_fixed_t;
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typedef signed int mad_fixed64hi_t;
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typedef unsigned int mad_fixed64lo_t;
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# else
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typedef signed long mad_fixed_t;
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typedef signed long mad_fixed64hi_t;
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typedef unsigned long mad_fixed64lo_t;
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# endif
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# if defined(_MSC_VER)
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# define mad_fixed64_t signed __int64
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# elif 1 || defined(__GNUC__)
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# define mad_fixed64_t signed long long
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# endif
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# if defined(FPM_FLOAT)
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typedef double mad_sample_t;
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# else
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typedef mad_fixed_t mad_sample_t;
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# endif
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/*
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* Fixed-point format: 0xABBBBBBB
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* A == whole part (sign + 3 bits)
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* B == fractional part (28 bits)
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*
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* Values are signed two's complement, so the effective range is:
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* 0x80000000 to 0x7fffffff
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* -8.0 to +7.9999999962747097015380859375
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*
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* The smallest representable value is:
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* 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9)
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*
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* 28 bits of fractional accuracy represent about
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* 8.6 digits of decimal accuracy.
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*
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* Fixed-point numbers can be added or subtracted as normal
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* integers, but multiplication requires shifting the 64-bit result
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* from 56 fractional bits back to 28 (and rounding.)
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*
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* Changing the definition of MAD_F_FRACBITS is only partially
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* supported, and must be done with care.
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*/
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# define MAD_F_FRACBITS 28
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# if MAD_F_FRACBITS == 28
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# define MAD_F(x) ((mad_fixed_t) (x##L))
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# else
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# if MAD_F_FRACBITS < 28
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# warning "MAD_F_FRACBITS < 28"
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# define MAD_F(x) ((mad_fixed_t) \
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(((x##L) + \
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(1L << (28 - MAD_F_FRACBITS - 1))) >> \
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(28 - MAD_F_FRACBITS)))
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# elif MAD_F_FRACBITS > 28
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# error "MAD_F_FRACBITS > 28 not currently supported"
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# define MAD_F(x) ((mad_fixed_t) \
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((x##L) << (MAD_F_FRACBITS - 28)))
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# endif
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# endif
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# define MAD_F_MIN ((mad_fixed_t) -0x80000000L)
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# define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL)
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# define MAD_F_ONE MAD_F(0x10000000)
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# define mad_f_tofixed(x) ((mad_fixed_t) \
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((x) * (double) (1L << MAD_F_FRACBITS) + 0.5))
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# define mad_f_todouble(x) ((double) \
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((x) / (double) (1L << MAD_F_FRACBITS)))
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# define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS)
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# define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1))
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/* (x should be positive) */
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# define mad_f_fromint(x) ((x) << MAD_F_FRACBITS)
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# define mad_f_add(x, y) ((x) + (y))
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# define mad_f_sub(x, y) ((x) - (y))
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# if defined(FPM_FLOAT)
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# error "FPM_FLOAT not yet supported"
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# undef MAD_F
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# define MAD_F(x) mad_f_todouble(x)
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# define mad_f_mul(x, y) ((x) * (y))
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# define mad_f_scale64
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# undef ASO_ZEROCHECK
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# elif defined(FPM_64BIT)
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/*
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* This version should be the most accurate if 64-bit types are supported by
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* the compiler, although it may not be the most efficient.
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*/
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# if defined(OPT_ACCURACY)
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# define mad_f_mul(x, y) \
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((mad_fixed_t) \
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((((mad_fixed64_t) (x) * (y)) + \
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(1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS))
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# else
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# define mad_f_mul(x, y) \
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((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS))
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# endif
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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/* --- Intel --------------------------------------------------------------- */
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# elif defined(FPM_INTEL) || defined (__i386__)
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# if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable: 4035) /* no return value */
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static __forceinline
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mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y)
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{
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enum {
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fracbits = MAD_F_FRACBITS
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};
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__asm {
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mov eax, x
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imul y
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shrd eax, edx, fracbits
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}
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/* implicit return of eax */
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}
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# pragma warning(pop)
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# define mad_f_mul mad_f_mul_inline
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# define mad_f_scale64
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# else
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/*
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* This Intel version is fast and accurate; the disposition of the least
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* significant bit depends on OPT_ACCURACY via mad_f_scale64().
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*/
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# define MAD_F_MLX(hi, lo, x, y) \
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asm ("imull %3" \
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: "=a" (lo), "=d" (hi) \
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: "%a" (x), "rm" (y) \
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: "cc")
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# if defined(OPT_ACCURACY)
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/*
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* This gives best accuracy but is not very fast.
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*/
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# define MAD_F_MLA(hi, lo, x, y) \
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({ mad_fixed64hi_t __hi; \
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mad_fixed64lo_t __lo; \
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MAD_F_MLX(__hi, __lo, (x), (y)); \
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asm ("addl %2,%0\n\t" \
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"adcl %3,%1" \
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: "=rm" (lo), "=rm" (hi) \
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: "r" (__lo), "r" (__hi), "0" (lo), "1" (hi) \
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: "cc"); \
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})
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# endif /* OPT_ACCURACY */
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# if defined(OPT_ACCURACY)
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/*
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* Surprisingly, this is faster than SHRD followed by ADC.
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*/
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed64hi_t __hi_; \
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mad_fixed64lo_t __lo_; \
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mad_fixed_t __result; \
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asm ("addl %4,%2\n\t" \
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"adcl %5,%3" \
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: "=rm" (__lo_), "=rm" (__hi_) \
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: "0" (lo), "1" (hi), \
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"ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0) \
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: "cc"); \
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asm ("shrdl %3,%2,%1" \
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: "=rm" (__result) \
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: "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# elif defined(OPT_INTEL)
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/*
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* Alternate Intel scaling that may or may not perform better.
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*/
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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asm ("shrl %3,%1\n\t" \
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"shll %4,%2\n\t" \
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"orl %2,%1" \
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: "=rm" (__result) \
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: "0" (lo), "r" (hi), \
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"I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# else
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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asm ("shrdl %3,%2,%1" \
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: "=rm" (__result) \
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: "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# endif /* OPT_ACCURACY */
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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# endif
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/* --- ARM ----------------------------------------------------------------- */
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# elif defined(FPM_ARM)
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/*
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* This ARM V4 version is as accurate as FPM_64BIT but much faster. The
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* least significant bit is properly rounded at no CPU cycle cost!
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*/
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# if 1
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/*
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* This is faster than the default implementation via MAD_F_MLX() and
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* mad_f_scale64().
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*/
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# define mad_f_mul(x, y) \
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({ mad_fixed64hi_t __hi; \
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mad_fixed64lo_t __lo; \
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mad_fixed_t __result; \
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asm ("smull %0, %1, %3, %4\n\t" \
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"movs %0, %0, lsr %5\n\t" \
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"adc %2, %0, %1, lsl %6" \
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: "=&r" (__lo), "=&r" (__hi), "=r" (__result) \
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: "%r" (x), "r" (y), \
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"M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# endif
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# define MAD_F_MLX(hi, lo, x, y) \
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asm ("smull %0, %1, %2, %3" \
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: "=&r" (lo), "=&r" (hi) \
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: "%r" (x), "r" (y))
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# define MAD_F_MLA(hi, lo, x, y) \
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asm ("smlal %0, %1, %2, %3" \
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: "+r" (lo), "+r" (hi) \
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: "%r" (x), "r" (y))
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# define MAD_F_MLN(hi, lo) \
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asm ("rsbs %0, %2, #0\n\t" \
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"rsc %1, %3, #0" \
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: "=r" (lo), "=r" (hi) \
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: "0" (lo), "1" (hi) \
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: "cc")
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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asm ("movs %0, %1, lsr %3\n\t" \
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"adc %0, %0, %2, lsl %4" \
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: "=&r" (__result) \
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: "r" (lo), "r" (hi), \
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"M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \
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: "cc"); \
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__result; \
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})
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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/* --- MIPS ---------------------------------------------------------------- */
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# elif defined(FPM_MIPS)
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/*
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* This MIPS version is fast and accurate; the disposition of the least
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* significant bit depends on OPT_ACCURACY via mad_f_scale64().
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*/
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# define MAD_F_MLX(hi, lo, x, y) \
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asm ("mult %2,%3" \
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: "=l" (lo), "=h" (hi) \
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: "%r" (x), "r" (y))
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# if defined(HAVE_MADD_ASM)
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# define MAD_F_MLA(hi, lo, x, y) \
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asm ("madd %2,%3" \
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: "+l" (lo), "+h" (hi) \
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: "%r" (x), "r" (y))
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# elif defined(HAVE_MADD16_ASM)
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/*
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* This loses significant accuracy due to the 16-bit integer limit in the
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* multiply/accumulate instruction.
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*/
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# define MAD_F_ML0(hi, lo, x, y) \
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asm ("mult %2,%3" \
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: "=l" (lo), "=h" (hi) \
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: "%r" ((x) >> 12), "r" ((y) >> 16))
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# define MAD_F_MLA(hi, lo, x, y) \
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asm ("madd16 %2,%3" \
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: "+l" (lo), "+h" (hi) \
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: "%r" ((x) >> 12), "r" ((y) >> 16))
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# define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo))
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# endif
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# if defined(OPT_SPEED)
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# define mad_f_scale64(hi, lo) \
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((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS)))
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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# endif
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/* --- SPARC --------------------------------------------------------------- */
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# elif defined(FPM_SPARC)
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/*
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* This SPARC V8 version is fast and accurate; the disposition of the least
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* significant bit depends on OPT_ACCURACY via mad_f_scale64().
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*/
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# define MAD_F_MLX(hi, lo, x, y) \
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asm ("smul %2, %3, %0\n\t" \
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"rd %%y, %1" \
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: "=r" (lo), "=r" (hi) \
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: "%r" (x), "rI" (y))
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/* --- PowerPC ------------------------------------------------------------- */
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# elif defined(FPM_PPC) || defined(__ppc__)
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/*
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* This PowerPC version is fast and accurate; the disposition of the least
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* significant bit depends on OPT_ACCURACY via mad_f_scale64().
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*/
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# define MAD_F_MLX(hi, lo, x, y) \
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do { \
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asm ("mullw %0,%1,%2" \
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: "=r" (lo) \
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: "%r" (x), "r" (y)); \
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asm ("mulhw %0,%1,%2" \
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: "=r" (hi) \
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: "%r" (x), "r" (y)); \
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} \
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while (0)
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# if defined(OPT_ACCURACY)
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/*
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* This gives best accuracy but is not very fast.
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*/
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# define MAD_F_MLA(hi, lo, x, y) \
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({ mad_fixed64hi_t __hi; \
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mad_fixed64lo_t __lo; \
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MAD_F_MLX(__hi, __lo, (x), (y)); \
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asm ("addc %0,%2,%3\n\t" \
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"adde %1,%4,%5" \
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: "=r" (lo), "=r" (hi) \
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: "%r" (lo), "r" (__lo), \
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"%r" (hi), "r" (__hi) \
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: "xer"); \
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})
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# endif
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# if defined(OPT_ACCURACY)
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/*
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* This is slower than the truncating version below it.
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*/
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result, __round; \
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asm ("rotrwi %0,%1,%2" \
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: "=r" (__result) \
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: "r" (lo), "i" (MAD_F_SCALEBITS)); \
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asm ("extrwi %0,%1,1,0" \
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: "=r" (__round) \
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: "r" (__result)); \
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asm ("insrwi %0,%1,%2,0" \
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: "+r" (__result) \
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: "r" (hi), "i" (MAD_F_SCALEBITS)); \
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asm ("add %0,%1,%2" \
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: "=r" (__result) \
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: "%r" (__result), "r" (__round)); \
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__result; \
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})
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# else
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# define mad_f_scale64(hi, lo) \
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({ mad_fixed_t __result; \
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asm ("rotrwi %0,%1,%2" \
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: "=r" (__result) \
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: "r" (lo), "i" (MAD_F_SCALEBITS)); \
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asm ("insrwi %0,%1,%2,0" \
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: "+r" (__result) \
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: "r" (hi), "i" (MAD_F_SCALEBITS)); \
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__result; \
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})
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# endif
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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/* --- Default ------------------------------------------------------------- */
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# elif defined(FPM_DEFAULT)
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/*
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* This version is the most portable but it loses significant accuracy.
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* Furthermore, accuracy is biased against the second argument, so care
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* should be taken when ordering operands.
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*
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* The scale factors are constant as this is not used with SSO.
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*
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* Pre-rounding is required to stay within the limits of compliance.
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*/
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# if defined(OPT_SPEED)
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# define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16))
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# else
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# define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \
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(((y) + (1L << 15)) >> 16))
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# endif
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/* ------------------------------------------------------------------------- */
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# else
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# error "no FPM selected"
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# endif
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/* default implementations */
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# if !defined(mad_f_mul)
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# define mad_f_mul(x, y) \
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({ register mad_fixed64hi_t __hi; \
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register mad_fixed64lo_t __lo; \
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MAD_F_MLX(__hi, __lo, (x), (y)); \
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mad_f_scale64(__hi, __lo); \
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})
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# endif
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# if !defined(MAD_F_MLA)
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# define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y)))
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# define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y)))
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# define MAD_F_MLN(hi, lo) ((lo) = -(lo))
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# define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo))
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# endif
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# if !defined(MAD_F_ML0)
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# define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y))
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# endif
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# if !defined(MAD_F_MLN)
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# define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi))
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# endif
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# if !defined(MAD_F_MLZ)
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# define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo))
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# endif
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# if !defined(mad_f_scale64)
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# if defined(OPT_ACCURACY)
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# define mad_f_scale64(hi, lo) \
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((((mad_fixed_t) \
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(((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \
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((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1)
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# else
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# define mad_f_scale64(hi, lo) \
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((mad_fixed_t) \
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(((hi) << (32 - MAD_F_SCALEBITS)) | \
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((lo) >> MAD_F_SCALEBITS)))
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# endif
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# define MAD_F_SCALEBITS MAD_F_FRACBITS
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# endif
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/* C routines */
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mad_fixed_t mad_f_abs(mad_fixed_t);
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mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t);
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# endif
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