mirror of
https://github.com/Rockbox/rockbox.git
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0133a4f052
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26560 a1c6a512-1295-4272-9138-f99709370657
79 lines
2 KiB
C
79 lines
2 KiB
C
#ifndef __M_FIXED_H__
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#define __M_FIXED_H__
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#ifdef ROCKBOX
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#include "plugin.h"
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#endif
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typedef int t_sample;
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#define t_fixed int
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#define fix1 18 /* (18) number of bits after comma */
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#define fixfac ((float)(1<<fix1)) /* float factor (for scaling ftofix ..) */
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/* fixed point multiplication and division */
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#if defined(ROCKBOX) && !defined(SIMULATOR)
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#if defined(CPU_ARM)
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#define mult(A,B) \
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({ \
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t_fixed lo; \
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t_fixed 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 >>= fix1 */ \
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"orr %[lo], %[lo], %[hi], lsl %[shl]" /* lo |= (hi << (32-fix1)) */ \
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: [lo]"=&r"(lo), [hi]"=&r"(hi) \
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: [x]"r"(A), [y]"r"(B), [shr]"r"(fix1), [shl]"r"(32-fix1)); \
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lo; \
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})
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#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
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#else /* CPU_... */
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#define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1)
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#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
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#endif /* CPU_... */
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#else /* ROCKBOX && !SIMULATOR */
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#define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1)
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#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
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#endif /* ROCKBOX && !SIMULATOR */
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/* conversion macros */
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#define itofix(a) ((a) << fix1)
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#define ftofix(a) ((t_fixed)( (a) *(double)fixfac + 0.5))
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#define fixtof(a) ((double) (a) * 1./(fixfac-0.5))
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#define fixtoi(a) ((a) >>fix1)
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/* Not working !! */
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#define fnum(a) ( (a) >>(fix1-16))
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#define ffrac(a) (0)
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/* mapping of fft functions */
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#ifdef FIXEDPOINT
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#define mayer_realifft imayer_realifft
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#define mayer_realfft imayer_realfft
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#define mayer_fft imayer_fft
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#define mayer_ifft imayer_ifft
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#endif
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#ifdef FIXEDPOINT
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#define SCALE16(x) (x>>(fix1-15))
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#define SCALE32(x) (x<<(32-fix1))
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#define INVSCALE16(x) (x<<8)
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#else
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#define SCALE16(x) (32767.*x)
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#define SCALE32(x) (2147483648.*x)
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#define INVSCALE16(x) ((float)3.051850e-05*x)
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#endif
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#endif
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