diff options
Diffstat (limited to 'src/libmad/fixed.h')
| -rw-r--r-- | src/libmad/fixed.h | 499 |
1 files changed, 0 insertions, 499 deletions
diff --git a/src/libmad/fixed.h b/src/libmad/fixed.h index 4b58abf56..e69de29bb 100644 --- a/src/libmad/fixed.h +++ b/src/libmad/fixed.h @@ -1,499 +0,0 @@ -/* - * libmad - MPEG audio decoder library - * Copyright (C) 2000-2004 Underbit Technologies, Inc. - * - * 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 program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * $Id: fixed.h,v 1.38 2004/02/17 02:02:03 rob Exp $ - */ - -# ifndef LIBMAD_FIXED_H -# define LIBMAD_FIXED_H - -# if SIZEOF_INT >= 4 -typedef signed int mad_fixed_t; - -typedef signed int mad_fixed64hi_t; -typedef unsigned int mad_fixed64lo_t; -# else -typedef signed long mad_fixed_t; - -typedef signed long mad_fixed64hi_t; -typedef unsigned long mad_fixed64lo_t; -# endif - -# if defined(_MSC_VER) -# define mad_fixed64_t signed __int64 -# elif 1 || defined(__GNUC__) -# define mad_fixed64_t signed long long -# endif - -# if defined(FPM_FLOAT) -typedef double mad_sample_t; -# else -typedef mad_fixed_t mad_sample_t; -# endif - -/* - * Fixed-point format: 0xABBBBBBB - * A == whole part (sign + 3 bits) - * B == fractional part (28 bits) - * - * Values are signed two's complement, so the effective range is: - * 0x80000000 to 0x7fffffff - * -8.0 to +7.9999999962747097015380859375 - * - * The smallest representable value is: - * 0x00000001 == 0.0000000037252902984619140625 (i.e. about 3.725e-9) - * - * 28 bits of fractional accuracy represent about - * 8.6 digits of decimal accuracy. - * - * Fixed-point numbers can be added or subtracted as normal - * integers, but multiplication requires shifting the 64-bit result - * from 56 fractional bits back to 28 (and rounding.) - * - * Changing the definition of MAD_F_FRACBITS is only partially - * supported, and must be done with care. - */ - -# define MAD_F_FRACBITS 28 - -# if MAD_F_FRACBITS == 28 -# define MAD_F(x) ((mad_fixed_t) (x##L)) -# else -# if MAD_F_FRACBITS < 28 -# warning "MAD_F_FRACBITS < 28" -# define MAD_F(x) ((mad_fixed_t) \ - (((x##L) + \ - (1L << (28 - MAD_F_FRACBITS - 1))) >> \ - (28 - MAD_F_FRACBITS))) -# elif MAD_F_FRACBITS > 28 -# error "MAD_F_FRACBITS > 28 not currently supported" -# define MAD_F(x) ((mad_fixed_t) \ - ((x##L) << (MAD_F_FRACBITS - 28))) -# endif -# endif - -# define MAD_F_MIN ((mad_fixed_t) -0x80000000L) -# define MAD_F_MAX ((mad_fixed_t) +0x7fffffffL) - -# define MAD_F_ONE MAD_F(0x10000000) - -# define mad_f_tofixed(x) ((mad_fixed_t) \ - ((x) * (double) (1L << MAD_F_FRACBITS) + 0.5)) -# define mad_f_todouble(x) ((double) \ - ((x) / (double) (1L << MAD_F_FRACBITS))) - -# define mad_f_intpart(x) ((x) >> MAD_F_FRACBITS) -# define mad_f_fracpart(x) ((x) & ((1L << MAD_F_FRACBITS) - 1)) - /* (x should be positive) */ - -# define mad_f_fromint(x) ((x) << MAD_F_FRACBITS) - -# define mad_f_add(x, y) ((x) + (y)) -# define mad_f_sub(x, y) ((x) - (y)) - -# if defined(FPM_FLOAT) -# error "FPM_FLOAT not yet supported" - -# undef MAD_F -# define MAD_F(x) mad_f_todouble(x) - -# define mad_f_mul(x, y) ((x) * (y)) -# define mad_f_scale64 - -# undef ASO_ZEROCHECK - -# elif defined(FPM_64BIT) - -/* - * This version should be the most accurate if 64-bit types are supported by - * the compiler, although it may not be the most efficient. - */ -# if defined(OPT_ACCURACY) -# define mad_f_mul(x, y) \ - ((mad_fixed_t) \ - ((((mad_fixed64_t) (x) * (y)) + \ - (1L << (MAD_F_SCALEBITS - 1))) >> MAD_F_SCALEBITS)) -# else -# define mad_f_mul(x, y) \ - ((mad_fixed_t) (((mad_fixed64_t) (x) * (y)) >> MAD_F_SCALEBITS)) -# endif - -# define MAD_F_SCALEBITS MAD_F_FRACBITS - -/* --- Intel --------------------------------------------------------------- */ - -# elif defined(FPM_INTEL) - -# if defined(_MSC_VER) -# pragma warning(push) -# pragma warning(disable: 4035) /* no return value */ -static __forceinline -mad_fixed_t mad_f_mul_inline(mad_fixed_t x, mad_fixed_t y) -{ - enum { - fracbits = MAD_F_FRACBITS - }; - - __asm { - mov eax, x - imul y - shrd eax, edx, fracbits - } - - /* implicit return of eax */ -} -# pragma warning(pop) - -# define mad_f_mul mad_f_mul_inline -# define mad_f_scale64 -# else -/* - * This Intel version is fast and accurate; the disposition of the least - * significant bit depends on OPT_ACCURACY via mad_f_scale64(). - */ -# define MAD_F_MLX(hi, lo, x, y) \ - asm ("imull %3" \ - : "=a" (lo), "=d" (hi) \ - : "%a" (x), "rm" (y) \ - : "cc") - -# if defined(OPT_ACCURACY) -/* - * This gives best accuracy but is not very fast. - */ -# define MAD_F_MLA(hi, lo, x, y) \ - ({ mad_fixed64hi_t __hi; \ - mad_fixed64lo_t __lo; \ - MAD_F_MLX(__hi, __lo, (x), (y)); \ - asm ("addl %2,%0\n\t" \ - "adcl %3,%1" \ - : "=rm" (lo), "=rm" (hi) \ - : "r" (__lo), "r" (__hi), "0" (lo), "1" (hi) \ - : "cc"); \ - }) -# endif /* OPT_ACCURACY */ - -# if defined(OPT_ACCURACY) -/* - * Surprisingly, this is faster than SHRD followed by ADC. - */ -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed64hi_t __hi_; \ - mad_fixed64lo_t __lo_; \ - mad_fixed_t __result; \ - asm ("addl %4,%2\n\t" \ - "adcl %5,%3" \ - : "=rm" (__lo_), "=rm" (__hi_) \ - : "0" (lo), "1" (hi), \ - "ir" (1L << (MAD_F_SCALEBITS - 1)), "ir" (0) \ - : "cc"); \ - asm ("shrdl %3,%2,%1" \ - : "=rm" (__result) \ - : "0" (__lo_), "r" (__hi_), "I" (MAD_F_SCALEBITS) \ - : "cc"); \ - __result; \ - }) -# elif defined(OPT_INTEL) -/* - * Alternate Intel scaling that may or may not perform better. - */ -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed_t __result; \ - asm ("shrl %3,%1\n\t" \ - "shll %4,%2\n\t" \ - "orl %2,%1" \ - : "=rm" (__result) \ - : "0" (lo), "r" (hi), \ - "I" (MAD_F_SCALEBITS), "I" (32 - MAD_F_SCALEBITS) \ - : "cc"); \ - __result; \ - }) -# else -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed_t __result; \ - asm ("shrdl %3,%2,%1" \ - : "=rm" (__result) \ - : "0" (lo), "r" (hi), "I" (MAD_F_SCALEBITS) \ - : "cc"); \ - __result; \ - }) -# endif /* OPT_ACCURACY */ - -# define MAD_F_SCALEBITS MAD_F_FRACBITS -# endif - -/* --- ARM ----------------------------------------------------------------- */ - -# elif defined(FPM_ARM) - -/* - * This ARM V4 version is as accurate as FPM_64BIT but much faster. The - * least significant bit is properly rounded at no CPU cycle cost! - */ -# if 1 -/* - * This is faster than the default implementation via MAD_F_MLX() and - * mad_f_scale64(). - */ -# define mad_f_mul(x, y) \ - ({ mad_fixed64hi_t __hi; \ - mad_fixed64lo_t __lo; \ - mad_fixed_t __result; \ - asm ("smull %0, %1, %3, %4\n\t" \ - "movs %0, %0, lsr %5\n\t" \ - "adc %2, %0, %1, lsl %6" \ - : "=&r" (__lo), "=&r" (__hi), "=r" (__result) \ - : "%r" (x), "r" (y), \ - "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \ - : "cc"); \ - __result; \ - }) -# endif - -# define MAD_F_MLX(hi, lo, x, y) \ - asm ("smull %0, %1, %2, %3" \ - : "=&r" (lo), "=&r" (hi) \ - : "%r" (x), "r" (y)) - -# define MAD_F_MLA(hi, lo, x, y) \ - asm ("smlal %0, %1, %2, %3" \ - : "+r" (lo), "+r" (hi) \ - : "%r" (x), "r" (y)) - -# define MAD_F_MLN(hi, lo) \ - asm ("rsbs %0, %2, #0\n\t" \ - "rsc %1, %3, #0" \ - : "=r" (lo), "=r" (hi) \ - : "0" (lo), "1" (hi) \ - : "cc") - -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed_t __result; \ - asm ("movs %0, %1, lsr %3\n\t" \ - "adc %0, %0, %2, lsl %4" \ - : "=&r" (__result) \ - : "r" (lo), "r" (hi), \ - "M" (MAD_F_SCALEBITS), "M" (32 - MAD_F_SCALEBITS) \ - : "cc"); \ - __result; \ - }) - -# define MAD_F_SCALEBITS MAD_F_FRACBITS - -/* --- MIPS ---------------------------------------------------------------- */ - -# elif defined(FPM_MIPS) - -/* - * This MIPS version is fast and accurate; the disposition of the least - * significant bit depends on OPT_ACCURACY via mad_f_scale64(). - */ -# define MAD_F_MLX(hi, lo, x, y) \ - asm ("mult %2,%3" \ - : "=l" (lo), "=h" (hi) \ - : "%r" (x), "r" (y)) - -# if defined(HAVE_MADD_ASM) -# define MAD_F_MLA(hi, lo, x, y) \ - asm ("madd %2,%3" \ - : "+l" (lo), "+h" (hi) \ - : "%r" (x), "r" (y)) -# elif defined(HAVE_MADD16_ASM) -/* - * This loses significant accuracy due to the 16-bit integer limit in the - * multiply/accumulate instruction. - */ -# define MAD_F_ML0(hi, lo, x, y) \ - asm ("mult %2,%3" \ - : "=l" (lo), "=h" (hi) \ - : "%r" ((x) >> 12), "r" ((y) >> 16)) -# define MAD_F_MLA(hi, lo, x, y) \ - asm ("madd16 %2,%3" \ - : "+l" (lo), "+h" (hi) \ - : "%r" ((x) >> 12), "r" ((y) >> 16)) -# define MAD_F_MLZ(hi, lo) ((mad_fixed_t) (lo)) -# endif - -# if defined(OPT_SPEED) -# define mad_f_scale64(hi, lo) \ - ((mad_fixed_t) ((hi) << (32 - MAD_F_SCALEBITS))) -# define MAD_F_SCALEBITS MAD_F_FRACBITS -# endif - -/* --- SPARC --------------------------------------------------------------- */ - -# elif defined(FPM_SPARC) - -/* - * This SPARC V8 version is fast and accurate; the disposition of the least - * significant bit depends on OPT_ACCURACY via mad_f_scale64(). - */ -# define MAD_F_MLX(hi, lo, x, y) \ - asm ("smul %2, %3, %0\n\t" \ - "rd %%y, %1" \ - : "=r" (lo), "=r" (hi) \ - : "%r" (x), "rI" (y)) - -/* --- PowerPC ------------------------------------------------------------- */ - -# elif defined(FPM_PPC) - -/* - * This PowerPC version is fast and accurate; the disposition of the least - * significant bit depends on OPT_ACCURACY via mad_f_scale64(). - */ -# define MAD_F_MLX(hi, lo, x, y) \ - do { \ - asm ("mullw %0,%1,%2" \ - : "=r" (lo) \ - : "%r" (x), "r" (y)); \ - asm ("mulhw %0,%1,%2" \ - : "=r" (hi) \ - : "%r" (x), "r" (y)); \ - } \ - while (0) - -# if defined(OPT_ACCURACY) -/* - * This gives best accuracy but is not very fast. - */ -# define MAD_F_MLA(hi, lo, x, y) \ - ({ mad_fixed64hi_t __hi; \ - mad_fixed64lo_t __lo; \ - MAD_F_MLX(__hi, __lo, (x), (y)); \ - asm ("addc %0,%2,%3\n\t" \ - "adde %1,%4,%5" \ - : "=r" (lo), "=r" (hi) \ - : "%r" (lo), "r" (__lo), \ - "%r" (hi), "r" (__hi) \ - : "xer"); \ - }) -# endif - -# if defined(OPT_ACCURACY) -/* - * This is slower than the truncating version below it. - */ -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed_t __result, __round; \ - asm ("rotrwi %0,%1,%2" \ - : "=r" (__result) \ - : "r" (lo), "i" (MAD_F_SCALEBITS)); \ - asm ("extrwi %0,%1,1,0" \ - : "=r" (__round) \ - : "r" (__result)); \ - asm ("insrwi %0,%1,%2,0" \ - : "+r" (__result) \ - : "r" (hi), "i" (MAD_F_SCALEBITS)); \ - asm ("add %0,%1,%2" \ - : "=r" (__result) \ - : "%r" (__result), "r" (__round)); \ - __result; \ - }) -# else -# define mad_f_scale64(hi, lo) \ - ({ mad_fixed_t __result; \ - asm ("rotrwi %0,%1,%2" \ - : "=r" (__result) \ - : "r" (lo), "i" (MAD_F_SCALEBITS)); \ - asm ("insrwi %0,%1,%2,0" \ - : "+r" (__result) \ - : "r" (hi), "i" (MAD_F_SCALEBITS)); \ - __result; \ - }) -# endif - -# define MAD_F_SCALEBITS MAD_F_FRACBITS - -/* --- Default ------------------------------------------------------------- */ - -# elif defined(FPM_DEFAULT) - -/* - * This version is the most portable but it loses significant accuracy. - * Furthermore, accuracy is biased against the second argument, so care - * should be taken when ordering operands. - * - * The scale factors are constant as this is not used with SSO. - * - * Pre-rounding is required to stay within the limits of compliance. - */ -# if defined(OPT_SPEED) -# define mad_f_mul(x, y) (((x) >> 12) * ((y) >> 16)) -# else -# define mad_f_mul(x, y) ((((x) + (1L << 11)) >> 12) * \ - (((y) + (1L << 15)) >> 16)) -# endif - -/* ------------------------------------------------------------------------- */ - -# else -# error "no FPM selected" -# endif - -/* default implementations */ - -# if !defined(mad_f_mul) -# define mad_f_mul(x, y) \ - ({ register mad_fixed64hi_t __hi; \ - register mad_fixed64lo_t __lo; \ - MAD_F_MLX(__hi, __lo, (x), (y)); \ - mad_f_scale64(__hi, __lo); \ - }) -# endif - -# if !defined(MAD_F_MLA) -# define MAD_F_ML0(hi, lo, x, y) ((lo) = mad_f_mul((x), (y))) -# define MAD_F_MLA(hi, lo, x, y) ((lo) += mad_f_mul((x), (y))) -# define MAD_F_MLN(hi, lo) ((lo) = -(lo)) -# define MAD_F_MLZ(hi, lo) ((void) (hi), (mad_fixed_t) (lo)) -# endif - -# if !defined(MAD_F_ML0) -# define MAD_F_ML0(hi, lo, x, y) MAD_F_MLX((hi), (lo), (x), (y)) -# endif - -# if !defined(MAD_F_MLN) -# define MAD_F_MLN(hi, lo) ((hi) = ((lo) = -(lo)) ? ~(hi) : -(hi)) -# endif - -# if !defined(MAD_F_MLZ) -# define MAD_F_MLZ(hi, lo) mad_f_scale64((hi), (lo)) -# endif - -# if !defined(mad_f_scale64) -# if defined(OPT_ACCURACY) -# define mad_f_scale64(hi, lo) \ - ((((mad_fixed_t) \ - (((hi) << (32 - (MAD_F_SCALEBITS - 1))) | \ - ((lo) >> (MAD_F_SCALEBITS - 1)))) + 1) >> 1) -# else -# define mad_f_scale64(hi, lo) \ - ((mad_fixed_t) \ - (((hi) << (32 - MAD_F_SCALEBITS)) | \ - ((lo) >> MAD_F_SCALEBITS))) -# endif -# define MAD_F_SCALEBITS MAD_F_FRACBITS -# endif - -/* C routines */ - -mad_fixed_t mad_f_abs(mad_fixed_t); -mad_fixed_t mad_f_div(mad_fixed_t, mad_fixed_t); - -# endif |