X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Fscalbnf.c;h=a5ad208b69929f24336fae40e6af37101c99a72f;hb=2fab90a71acd3698954c08b9062db67188443dd7;hp=e5c76db318e1925272605d577abc4b3a0b625e35;hpb=666271c105e4137bdfa195e217799d74143370d4;p=musl

diff --git a/src/math/scalbnf.c b/src/math/scalbnf.c
index e5c76db3..a5ad208b 100644
--- a/src/math/scalbnf.c
+++ b/src/math/scalbnf.c
@@ -1,35 +1,31 @@
-#include "libm.h"
+#include <math.h>
+#include <stdint.h>
 
 float scalbnf(float x, int n)
 {
-	/* make sure result is stored as double on overflow or underflow */
-	volatile float z;
-	float scale;
+	union {float f; uint32_t i;} u;
+	float_t y = x;
 
 	if (n > 127) {
-		x *= 0x1p127f;
+		y *= 0x1p127f;
 		n -= 127;
 		if (n > 127) {
-			x *= 0x1p127f;
+			y *= 0x1p127f;
 			n -= 127;
-			if (n > 127) {
-				z = x * 0x1p127f;
-				return z;
-			}
+			if (n > 127)
+				n = 127;
 		}
 	} else if (n < -126) {
-		x *= 0x1p-126f;
-		n += 126;
+		y *= 0x1p-126f * 0x1p24f;
+		n += 126 - 24;
 		if (n < -126) {
-			x *= 0x1p-126f;
-			n += 126;
-			if (n < -126) {
-				z = x * 0x1p-126f;
-				return z;
-			}
+			y *= 0x1p-126f * 0x1p24f;
+			n += 126 - 24;
+			if (n < -126)
+				n = -126;
 		}
 	}
-	SET_FLOAT_WORD(scale, (uint32_t)(0x7f+n)<<23);
-	z = x * scale;
-	return z;
+	u.i = (uint32_t)(0x7f+n)<<23;
+	x = y * u.f;
+	return x;
 }