elf.h: add ELFCOMPRESS_ZSTD

[musl] / src / math / scalbnf.c

diff --git a/src/math/scalbnf.c b/src/math/scalbnf.c
index 243dafd..a5ad208 100644 (file)
--- a/src/math/scalbnf.c
+++ b/src/math/scalbnf.c
@@ -1,28 +1,31 @@
-#include "libm.h"
+#include <math.h>
+#include <stdint.h>
 
 float scalbnf(float x, int n)
 {
-       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)
-                               return x * 0x1p127f;
+                               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;
+                       y *= 0x1p-126f * 0x1p24f;
+                       n += 126 - 24;
                        if (n < -126)
-                               return x * 0x1p-126f;
+                               n = -126;
                }
        }
-       SET_FLOAT_WORD(scale, (uint32_t)(0x7f+n)<<23);
-       return x * scale;
+       u.i = (uint32_t)(0x7f+n)<<23;
+       x = y * u.f;
+       return x;
 }