math: excess precision fix modf, modff, scalbn, scalbnf

[musl] / src / math / scalbn.c

diff --git a/src/math/scalbn.c b/src/math/scalbn.c
index 42a2b29..003141e 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) {
@@ -13,8 +11,8 @@ double scalbn(double x, int n)
                        x *= 0x1p1023;
                        n -= 1023;
                        if (n > 1023) {
-                               z = x * 0x1p1023;
-                               return z;
+                               STRICT_ASSIGN(double, x, x * 0x1p1023);
+                               return x;
                        }
                }
        } else if (n < -1022) {
@@ -24,12 +22,12 @@ double scalbn(double x, int n)
                        x *= 0x1p-1022;
                        n += 1022;
                        if (n < -1022) {
-                               z = x * 0x1p-1022;
-                               return z;
+                               STRICT_ASSIGN(double, x, x * 0x1p-1022);
+                               return x;
                        }
                }
        }
        INSERT_WORDS(scale, (uint32_t)(0x3ff+n)<<20, 0);
-       z = x * scale;
-       return z;
+       STRICT_ASSIGN(double, x, x * scale);
+       return x;
 }