X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Ftanhf.c;h=10636fbd7be6c21d1c58326eba2bf7179b0dea8f;hb=062bb737de06c3906b4b4a07c7fc0fb286287efe;hp=8099ec3019a9ea3de0f88bfa98be977ac55d2e23;hpb=5d5ab51862cbd010bdf52dc3b04b0967450bcd1a;p=musl

diff --git a/src/math/tanhf.c b/src/math/tanhf.c
index 8099ec30..10636fbd 100644
--- a/src/math/tanhf.c
+++ b/src/math/tanhf.c
@@ -17,7 +17,7 @@ float tanhf(float x)
 		/* |x| > log(3)/2 ~= 0.5493 or nan */
 		if (w > 0x41200000) {
 			/* |x| > 10 */
-			t = 1 + 0/(x + 0x1p-120f);
+			t = 1 + 0/x;
 		} else {
 			t = expm1f(2*x);
 			t = 1 - 2/(t+2);
@@ -26,10 +26,14 @@ float tanhf(float x)
 		/* |x| > log(5/3)/2 ~= 0.2554 */
 		t = expm1f(2*x);
 		t = t/(t+2);
-	} else {
-		/* |x| is small */
+	} else if (w >= 0x00800000) {
+		/* |x| >= 0x1p-126 */
 		t = expm1f(-2*x);
 		t = -t/(t+2);
+	} else {
+		/* |x| is subnormal */
+		FORCE_EVAL(x*x);
+		t = x;
 	}
 	return sign ? -t : t;
 }