fusl/src/math/rint.c - Issue 1573973002: Add a "fork" of musl as //fusl.

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Side by Side Diff: fusl/src/math/rint.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master

Patch Set: Created 4 years, 11 months ago

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	1 #include <float.h>

	2 #include <math.h>

	3 #include <stdint.h>

	4

	5 #if FLT_EVAL_METHOD==0 \|\| FLT_EVAL_METHOD==1

	6 #define EPS DBL_EPSILON

	7 #elif FLT_EVAL_METHOD==2

	8 #define EPS LDBL_EPSILON

	9 #endif

	10 static const double_t toint = 1/EPS;

	11

	12 double rint(double x)

	13 {

	14 union {double f; uint64_t i;} u = {x};

	15 int e = u.i>>52 & 0x7ff;

	16 int s = u.i>>63;

	17 double_t y;

	18

	19 if (e >= 0x3ff+52)

	20 return x;

	21 if (s)

	22 y = x - toint + toint;

	23 else

	24 y = x + toint - toint;

	25 if (y == 0)

	26 return s ? -0.0 : 0;

	27 return y;

	28 }

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