From e2fe959fe2a450f74271d4d3c4b0d9456f889125 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Tue, 13 Nov 2012 00:49:55 +0100 Subject: [PATCH] math: raise flags in logl.c on <= 0 arguments --- src/math/log2l.c | 3 +-- src/math/logl.c | 9 ++------- 2 files changed, 3 insertions(+), 9 deletions(-) diff --git a/src/math/log2l.c b/src/math/log2l.c index 76a7aacd..345b395d 100644 --- a/src/math/log2l.c +++ b/src/math/log2l.c @@ -108,8 +108,7 @@ static const long double S[4] = { long double log2l(long double x) { - long double z; - long double y; + long double y, z; int e; if (isnan(x)) diff --git a/src/math/logl.c b/src/math/logl.c index ffd81038..ef2b5515 100644 --- a/src/math/logl.c +++ b/src/math/logl.c @@ -50,11 +50,6 @@ * In the tests over the interval exp(+-10000), the logarithms * of the random arguments were uniformly distributed over * [-10000, +10000]. - * - * ERROR MESSAGES: - * - * log singularity: x = 0; returns -INFINITY - * log domain: x < 0; returns NAN */ #include "libm.h" @@ -121,8 +116,8 @@ long double logl(long double x) return x; if (x <= 0.0) { if (x == 0.0) - return -INFINITY; - return NAN; + return -1/(x+0); /* -inf with divbyzero */ + return 0/0.0f; /* nan with invalid */ } /* separate mantissa from exponent */ -- 2.25.1