X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Fmath%2Fscalbn.c;fp=src%2Fmath%2Fscalbn.c;h=42a2b2943e32bc9a0700f4d789bfda84d41547d0;hp=c9c7af804acb4059c7e26336a5a8f7521e671ef9;hb=666271c105e4137bdfa195e217799d74143370d4;hpb=662ed2006568f953290f5e0b40cce38252db78f4

diff --git a/src/math/scalbn.c b/src/math/scalbn.c
index c9c7af80..42a2b294 100644
--- a/src/math/scalbn.c
+++ b/src/math/scalbn.c
@@ -2,6 +2,8 @@
 
 double scalbn(double x, int n)
 {
+	/* make sure result is stored as double on overflow or underflow */
+	volatile double z;
 	double scale;
 
 	if (n > 1023) {
@@ -10,8 +12,10 @@ double scalbn(double x, int n)
 		if (n > 1023) {
 			x *= 0x1p1023;
 			n -= 1023;
-			if (n > 1023)
-				return x * 0x1p1023;
+			if (n > 1023) {
+				z = x * 0x1p1023;
+				return z;
+			}
 		}
 	} else if (n < -1022) {
 		x *= 0x1p-1022;
@@ -19,10 +23,13 @@ double scalbn(double x, int n)
 		if (n < -1022) {
 			x *= 0x1p-1022;
 			n += 1022;
-			if (n < -1022)
-				return x * 0x1p-1022;
+			if (n < -1022) {
+				z = x * 0x1p-1022;
+				return z;
+			}
 		}
 	}
 	INSERT_WORDS(scale, (uint32_t)(0x3ff+n)<<20, 0);
-	return x * scale;
+	z = x * scale;
+	return z;
 }