X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Flogl.c;h=ef2b55156ad57f18f1b9223054440ea4e1569d5f;hb=9448b0513e2eec020fbca9c10412b83df5027a16;hp=ee7ca64a8201a44fdc1bbc04b522947bc9ad4cd5;hpb=9e2a895aaaa4a3985e94ae4f3e24c1af65f9bb34;p=musl

diff --git a/src/math/logl.c b/src/math/logl.c
index ee7ca64a..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"
@@ -119,10 +114,10 @@ long double logl(long double x)
 		return x;
 	if (x == INFINITY)
 		return x;
-	if (x <= 0.0L) {
-		if (x == 0.0L)
-			return -INFINITY;
-		return NAN;
+	if (x <= 0.0) {
+		if (x == 0.0)
+			return -1/(x+0); /* -inf with divbyzero */
+		return 0/0.0f; /* nan with invalid */
 	}
 
 	/* separate mantissa from exponent */
@@ -137,12 +132,12 @@ long double logl(long double x)
 	if (e > 2 || e < -2) {
 		if (x < SQRTH) {  /* 2(2x-1)/(2x+1) */
 			e -= 1;
-			z = x - 0.5L;
-			y = 0.5L * z + 0.5L;
+			z = x - 0.5;
+			y = 0.5 * z + 0.5;
 		} else {  /*  2 (x-1)/(x+1)   */
-			z = x - 0.5L;
-			z -= 0.5L;
-			y = 0.5L * x  + 0.5L;
+			z = x - 0.5;
+			z -= 0.5;
+			y = 0.5 * x  + 0.5;
 		}
 		x = z / y;
 		z = x*x;
@@ -156,14 +151,14 @@ long double logl(long double x)
 	/* logarithm using log(1+x) = x - .5x**2 + x**3 P(x)/Q(x) */
 	if (x < SQRTH) {
 		e -= 1;
-		x = ldexpl(x, 1) - 1.0L; /*  2x - 1  */
+		x = 2.0*x - 1.0;
 	} else {
-		x = x - 1.0L;
+		x = x - 1.0;
 	}
 	z = x*x;
 	y = x * (z * __polevll(x, P, 6) / __p1evll(x, Q, 6));
 	y = y + e * C2;
-	z = y - ldexpl(z, -1);   /*  y - 0.5 * z  */
+	z = y - 0.5*z;
 	/* Note, the sum of above terms does not exceed x/4,
 	 * so it contributes at most about 1/4 lsb to the error.
 	 */