X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Filogb.c;h=5a1819d85f4c31e1de8302095586eddea260d21a;hb=c4359e01303da2755fe7e8033826b132eb3659b1;hp=c5915a0ca4b306e670af772b137d6a94a38a1077;hpb=b69f695acedd4ce2798ef9ea28d834ceccc789bd;p=musl

diff --git a/src/math/ilogb.c b/src/math/ilogb.c
index c5915a0c..5a1819d8 100644
--- a/src/math/ilogb.c
+++ b/src/math/ilogb.c
@@ -8,14 +8,17 @@ int ilogb(double x)
 
 	if (!e) {
 		u.bits <<= 12;
-		if (u.bits == 0)
+		if (u.bits == 0) {
+			FORCE_EVAL(0/0.0f);
 			return FP_ILOGB0;
+		}
 		/* subnormal x */
-		// FIXME: scale up subnormals with a *0x1p53 or find top set bit with a better method
 		for (e = -0x3ff; u.bits < (uint64_t)1<<63; e--, u.bits<<=1);
 		return e;
 	}
-	if (e == 0x7ff)
+	if (e == 0x7ff) {
+		FORCE_EVAL(0/0.0f);
 		return u.bits<<12 ? FP_ILOGBNAN : INT_MAX;
+	}
 	return e - 0x3ff;
 }