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| author | Szabolcs Nagy <nsz@port70.net> | 2013-09-04 07:51:11 +0000 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2013-09-05 11:30:08 +0000 |
| commit | 39c910fb061114e6aa5c3bf2c94b1d7262d62221 (patch) | |
| tree | 5ca9b82746e8ac224f93dcda1b8d19f95b68eda2 /src/math/expl.c | |
| parent | ea9bb95a5b36c0a3d2ed8fb03808745b406c2633 (diff) | |
| download | musl-39c910fb061114e6aa5c3bf2c94b1d7262d62221.tar.gz musl-39c910fb061114e6aa5c3bf2c94b1d7262d62221.tar.xz musl-39c910fb061114e6aa5c3bf2c94b1d7262d62221.zip | |
math: fix underflow in exp*.c and long double handling in exp2l
* don't care about inexact flag * use double_t and float_t (faster, smaller, more precise on x86) * exp: underflow when result is zero or subnormal and not -inf * exp2: underflow when result is zero or subnormal and not exact * expm1: underflow when result is zero or subnormal * expl: don't underflow on -inf * exp2: fix incorrect comment * expm1: simplify special case handling and overflow properly * expm1: cleanup final scaling and fix negative left shift ub (twopk)
Diffstat (limited to 'src/math/expl.c')
| -rw-r--r-- | src/math/expl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/expl.c b/src/math/expl.c index 50a04297..b62980fa 100644 --- a/src/math/expl.c +++ b/src/math/expl.c @@ -100,7 +100,7 @@ long double expl(long double x) if (x > 11356.5234062941439488L) /* x > ln(2^16384 - 0.5) */ return x * 0x1p16383L; if (x < -11399.4985314888605581L) /* x < ln(2^-16446) */ - return 0x1p-10000L * 0x1p-10000L; + return -0x1p-16445L/x; /* Express e**x = e**f 2**k * = e**(f + k ln(2)) |