math: minor scalbn*.c simplification

[musl] / src / math / scalbn.c

diff --git a/src/math/scalbn.c b/src/math/scalbn.c
index 42a2b29..1fec432 100644 (file)
--- a/src/math/scalbn.c
+++ b/src/math/scalbn.c
@@ -2,8 +2,6 @@
 
 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) {
@@ -12,10 +10,8 @@ double scalbn(double x, int n)
                if (n > 1023) {
                        x *= 0x1p1023;
                        n -= 1023;
-                       if (n > 1023) {
-                               z = x * 0x1p1023;
-                               return z;
-                       }
+                       if (n > 1023)
+                               n = 1023;
                }
        } else if (n < -1022) {
                x *= 0x1p-1022;
@@ -23,13 +19,11 @@ double scalbn(double x, int n)
                if (n < -1022) {
                        x *= 0x1p-1022;
                        n += 1022;
-                       if (n < -1022) {
-                               z = x * 0x1p-1022;
-                               return z;
-                       }
+                       if (n < -1022)
+                               n = -1022;
                }
        }
        INSERT_WORDS(scale, (uint32_t)(0x3ff+n)<<20, 0);
-       z = x * scale;
-       return z;
+       STRICT_ASSIGN(double, x, x * scale);
+       return x;
 }