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| author | Szabolcs Nagy <nsz@port70.net> | 2012-11-12 23:41:48 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2012-11-12 23:41:48 +0100 |
| commit | 6f64505df37c41d7496612dffe86048765339a7a (patch) | |
| tree | 807810ffbaa29337466fbd8c5fd5e66ee7e9c68b /src | |
| parent | b03c19a4b946b28dec03cf0820dc9d066fd143ce (diff) | |
| download | musl-6f64505df37c41d7496612dffe86048765339a7a.tar.gz | |
math: fix exception behaviour of expm1l.c on inf and nan
Diffstat (limited to 'src')
| -rw-r--r-- | src/math/expm1l.c | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/src/math/expm1l.c b/src/math/expm1l.c index ca0d141f..21a86c00 100644 --- a/src/math/expm1l.c +++ b/src/math/expm1l.c @@ -44,13 +44,7 @@ * * Relative error: * arithmetic domain # trials peak rms - * IEEE -45,+MAXLOG 200,000 1.2e-19 2.5e-20 - * - * ERROR MESSAGES: - * - * message condition value returned - * expm1l overflow x > MAXLOG MAXNUM - * + * IEEE -45,+maxarg 200,000 1.2e-19 2.5e-20 */ #include "libm.h" @@ -61,7 +55,6 @@ long double expm1l(long double x) return expm1(x); } #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 -static const long double MAXLOGL = 1.1356523406294143949492E4L; /* exp(x) - 1 = x + 0.5 x^2 + x^3 P(x)/Q(x) -.5 ln 2 < x < .5 ln 2 @@ -83,19 +76,20 @@ C1 = 6.93145751953125E-1L, C2 = 1.428606820309417232121458176568075500134E-6L, /* ln 2^-65 */ minarg = -4.5054566736396445112120088E1L, -huge = 0x1p10000L; +/* ln 2^16384 */ +maxarg = 1.1356523406294143949492E4L; long double expm1l(long double x) { long double px, qx, xx; int k; - /* Overflow. */ - if (x > MAXLOGL) - return huge*huge; /* overflow */ + if (isnan(x)) + return x; + if (x > maxarg) + return x*0x1p16383L; /* overflow, unless x==inf */ if (x == 0.0) return x; - /* Minimum value.*/ if (x < minarg) return -1.0; |