forked from KolibriOS/kolibrios
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#ifndef _MINGWEX_FASTMATH_H_
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#define _MINGWEX_FASTMATH_H_
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/* Fast math inlines
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No range or domain checks. No setting of errno. No tweaks to
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protect precision near range limits. */
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/* For now this is an internal header with just the functions that
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are currently used in building libmingwex.a math components */
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/* FIXME: We really should get rid of the code duplication using euther
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C++ templates or tgmath-type macros. */
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static __inline__ double __fast_sqrt (double x)
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{
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double res;
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asm __volatile__ ("fsqrt" : "=t" (res) : "0" (x));
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return res;
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}
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static __inline__ long double __fast_sqrtl (long double x)
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{
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long double res;
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asm __volatile__ ("fsqrt" : "=t" (res) : "0" (x));
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return res;
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}
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static __inline__ float __fast_sqrtf (float x)
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{
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float res;
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asm __volatile__ ("fsqrt" : "=t" (res) : "0" (x));
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return res;
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}
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static __inline__ double __fast_log (double x)
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{
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double res;
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2x"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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static __inline__ long double __fast_logl (long double x)
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{
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long double res;
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2x"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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static __inline__ float __fast_logf (float x)
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{
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float res;
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2x"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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static __inline__ double __fast_log1p (double x)
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{
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double res;
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/* fyl2xp1 accurate only for |x| <= 1.0 - 0.5 * sqrt (2.0) */
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if (fabs (x) >= 1.0 - 0.5 * 1.41421356237309504880)
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res = __fast_log (1.0 + x);
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else
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2xp1"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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static __inline__ long double __fast_log1pl (long double x)
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{
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long double res;
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/* fyl2xp1 accurate only for |x| <= 1.0 - 0.5 * sqrt (2.0) */
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if (fabsl (x) >= 1.0L - 0.5L * 1.41421356237309504880L)
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res = __fast_logl (1.0L + x);
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else
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2xp1"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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static __inline__ float __fast_log1pf (float x)
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{
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float res;
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/* fyl2xp1 accurate only for |x| <= 1.0 - 0.5 * sqrt (2.0) */
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if (fabsf (x) >= 1.0 - 0.5 * 1.41421356237309504880)
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res = __fast_logf (1.0 + x);
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else
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asm __volatile__
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("fldln2\n\t"
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"fxch\n\t"
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"fyl2xp1"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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#endif
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