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math: fix expm1f overflow threshold

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the threshold was wrong so expm1f overflowed to inf a bit too early
and on most targets uint32_t compare is faster than float compare so
use that.

this also fixes sinhf incorrectly returning nan for some values where
the internal expm1f overflowed.
This commit is contained in:
Szabolcs Nagy 2021-02-05 19:51:36 +00:00 • committed by Rich Felker
parent c4c38e6364
commit 964104f9f0
1 changed files with 1 additions and 2 deletions
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3
src/math/expm1f.c
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@ -16,7 +16,6 @@
#include "libm.h"
static const float
o_threshold = 8.8721679688e+01, /* 0x42b17180 */
ln2_hi = 6.9313812256e-01, /* 0x3f317180 */
ln2_lo = 9.0580006145e-06, /* 0x3717f7d1 */
invln2 = 1.4426950216e+00, /* 0x3fb8aa3b */
@ -41,7 +40,7 @@ float expm1f(float x)
return x;
if (sign)
return -1;
if (x > o_threshold) {
if (hx > 0x42b17217) { /* x > log(FLT_MAX) */
x *= 0x1p127f;
return x;
}