81 lines
1.7 KiB
C
81 lines
1.7 KiB
C
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#include <types.h>
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typedef double double_t;
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#ifndef fp_force_evalf
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#define fp_force_evalf fp_force_evalf
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static inline void fp_force_evalf(float x)
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{
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volatile float y;
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y = x;
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}
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#endif
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#ifndef fp_force_eval
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#define fp_force_eval fp_force_eval
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static inline void fp_force_eval(double x)
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{
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volatile double y;
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y = x;
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}
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#endif
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#ifndef fp_force_evall
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#define fp_force_evall fp_force_evall
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static inline void fp_force_evall(long double x)
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{
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volatile long double y;
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y = x;
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}
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#endif
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#define FORCE_EVAL(x) do { \
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if (sizeof(x) == sizeof(float)) { \
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fp_force_evalf(x); \
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} else if (sizeof(x) == sizeof(double)) { \
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fp_force_eval(x); \
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} else { \
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fp_force_evall(x); \
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} \
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} while(0)
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#define DBL_TRUE_MIN 4.94065645841246544177e-324
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#define DBL_MIN 2.22507385850720138309e-308
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#define DBL_MAX 1.79769313486231570815e+308
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#define DBL_EPSILON 2.22044604925031308085e-16
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#if FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 1
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#define EPS DBL_EPSILON
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#elif FLT_EVAL_METHOD == 2
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#define EPS LDBL_EPSILON
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#endif
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static const double_t toint = 1 / EPS;
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double ceil(double x)
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{
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union
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{
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double f;
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uint64_t i;
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} u = {x};
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int e = u.i >> 52 & 0x7ff;
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double_t y;
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if (e >= 0x3ff + 52 || x == 0)
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return x;
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/* y = int(x) - x, where int(x) is an integer neighbor of x */
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if (u.i >> 63)
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y = x - toint + toint - x;
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else
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y = x + toint - toint - x;
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/* special case because of non-nearest rounding modes */
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if (e <= 0x3ff - 1)
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{
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FORCE_EVAL(y);
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return u.i >> 63 ? -0.0 : 1;
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}
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if (y < 0)
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return x + y + 1;
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return x + y;
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}
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