72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
#ifndef _MATH_H
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#define _MATH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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// NOTE(orca): not doing anything fancy for float_t and double_t
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typedef float float_t;
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typedef double double_t;
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#define NAN __builtin_nanf("")
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#define INFINITY __builtin_inff()
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#define FP_NAN 0
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#define FP_INFINITE 1
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#define FP_ZERO 2
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#define FP_SUBNORMAL 3
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#define FP_NORMAL 4
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int __fpclassify(double);
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int __fpclassifyf(float);
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int __fpclassifyl(long double);
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static __inline unsigned __FLOAT_BITS(float __f)
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{
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union {float __f; unsigned __i;} __u;
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__u.__f = __f;
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return __u.__i;
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}
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static __inline unsigned long long __DOUBLE_BITS(double __f)
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{
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union {double __f; unsigned long long __i;} __u;
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__u.__f = __f;
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return __u.__i;
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}
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#define fpclassify(x) ( \
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sizeof(x) == sizeof(float) ? __fpclassifyf(x) : \
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sizeof(x) == sizeof(double) ? __fpclassify(x) : \
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__fpclassifyl(x) )
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#define isinf(x) ( \
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sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) == 0x7f800000 : \
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sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & -1ULL>>1) == 0x7ffULL<<52 : \
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__fpclassifyl(x) == FP_INFINITE)
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#define isnan(x) ( \
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sizeof(x) == sizeof(float) ? (__FLOAT_BITS(x) & 0x7fffffff) > 0x7f800000 : \
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sizeof(x) == sizeof(double) ? (__DOUBLE_BITS(x) & -1ULL>>1) > 0x7ffULL<<52 : \
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__fpclassifyl(x) == FP_NAN)
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double acos(double);
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double ceil(double);
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double fabs(double);
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double floor(double);
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double fmod(double, double);
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double pow(double, double);
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double sqrt(double);
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#ifdef __cplusplus
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}
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#endif
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#endif
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