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

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Side by Side Diff: fusl/src/math/roundf.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 "libm.h"

	2

	3 #if FLT_EVAL_METHOD==0

	4 #define EPS FLT_EPSILON

	5 #elif 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 float_t toint = 1/EPS;

	11

	12 float roundf(float x)

	13 {

	14 union {float f; uint32_t i;} u = {x};

	15 int e = u.i >> 23 & 0xff;

	16 float_t y;

	17

	18 if (e >= 0x7f+23)

	19 return x;

	20 if (u.i >> 31)

	21 x = -x;

	22 if (e < 0x7f-1) {

	23 FORCE_EVAL(x + toint);

	24 return 0*u.f;

	25 }

	26 y = x + toint - toint - x;

	27 if (y > 0.5f)

	28 y = y + x - 1;

	29 else if (y <= -0.5f)

	30 y = y + x + 1;

	31 else

	32 y = y + x;

	33 if (u.i >> 31)

	34 y = -y;

	35 return y;

	36 }

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