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cuserid: don't return truncated results
[musl]
/
src
/
math
/
scalbnf.c
diff --git
a/src/math/scalbnf.c
b/src/math/scalbnf.c
index
e5c76db
..
a5ad208
100644
(file)
--- 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)
{
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) {
if (n > 127) {
-
x
*= 0x1p127f;
+
y
*= 0x1p127f;
n -= 127;
if (n > 127) {
n -= 127;
if (n > 127) {
-
x
*= 0x1p127f;
+
y
*= 0x1p127f;
n -= 127;
n -= 127;
- if (n > 127) {
- z = x * 0x1p127f;
- return z;
- }
+ if (n > 127)
+ n = 127;
}
} else if (n < -126) {
}
} else if (n < -126) {
-
x *= 0x1p-126
f;
- n += 126;
+
y *= 0x1p-126f * 0x1p24
f;
+ n += 126
- 24
;
if (n < -126) {
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
;
}
}