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math: cosh cleanup
[musl]
/
src
/
math
/
coshf.c
diff --git
a/src/math/coshf.c
b/src/math/coshf.c
index
97318f1
..
2bed125
100644
(file)
--- a/
src/math/coshf.c
+++ b/
src/math/coshf.c
@@
-15,43
+15,40
@@
#include "libm.h"
#include "libm.h"
-static const float huge = 1.0e30;
-
float coshf(float x)
{
float coshf(float x)
{
- float t, w;
- int32_t ix;
-
- GET_FLOAT_WORD(ix, x);
- ix &= 0x7fffffff;
+ union {float f; uint32_t i;} u = {.f = x};
+ uint32_t ix;
+ float t;
- /* x is INF or NaN */
- if (ix >= 0x7f800000)
- return x*x;
+ /* |x| */
+ u.i &= 0x7fffffff;
+ x = u.f;
+ ix = u.i;
/* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */
if (ix < 0x3eb17218) {
/* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */
if (ix < 0x3eb17218) {
- t = expm1f(fabsf(x));
- w = 1.0f+t;
- if (ix<0x39800000)
- return 1.0f; /* cosh(tiny) = 1 */
- return 1.0f + (t*t)/(w+w);
+ t = expm1f(x);
+ if (ix < 0x39800000)
+ return 1;
+ return 1 + t*t/(2*(1+t));
}
/* |x| in [0.5*ln2,9], return (exp(|x|)+1/exp(|x|))/2; */
if (ix < 0x41100000) {
}
/* |x| in [0.5*ln2,9], return (exp(|x|)+1/exp(|x|))/2; */
if (ix < 0x41100000) {
- t = expf(
fabsf(x)
);
+ t = expf(
x
);
return 0.5f*t + 0.5f/t;
}
/* |x| in [9, log(maxfloat)] return 0.5f*exp(|x|) */
if (ix < 0x42b17217)
return 0.5f*t + 0.5f/t;
}
/* |x| in [9, log(maxfloat)] return 0.5f*exp(|x|) */
if (ix < 0x42b17217)
- return 0.5f*expf(
fabsf(x)
);
+ return 0.5f*expf(
x
);
/* |x| in [log(maxfloat), overflowthresold] */
if (ix <= 0x42b2d4fc)
/* |x| in [log(maxfloat), overflowthresold] */
if (ix <= 0x42b2d4fc)
- return __expo2f(
fabsf(x)
);
+ return __expo2f(
x
);
- /* |x| > overflowthresold, cosh(x) overflow */
- return huge*huge;
+ /* |x| > overflowthresold or nan */
+ x *= 0x1p127f;
+ return x;
}
}