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-rw-r--r--sysdeps/libm-ieee754/s_cbrtf.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/sysdeps/libm-ieee754/s_cbrtf.c b/sysdeps/libm-ieee754/s_cbrtf.c
index f9f687c011..fa0fef9987 100644
--- a/sysdeps/libm-ieee754/s_cbrtf.c
+++ b/sysdeps/libm-ieee754/s_cbrtf.c
@@ -46,8 +46,10 @@ __cbrtf (float x)
xm = __frexpf (fabsf (x), &xe);
/* If X is not finite or is null return it (with raising exceptions
- if necessary. */
- if (xe == 0)
+ if necessary.
+ Note: *Our* version of `frexp' sets XE to zero if the argument is
+ Inf or NaN. This is not portable but faster. */
+ if (xe == 0 && fpclassify (x) <= FP_ZERO)
return x + x;
u = (0.492659620528969547 + (0.697570460207922770