math: use fnstsw consistently instead of fstsw in x87 asm

[musl] / src / math / exp10f.c

diff --git a/src/math/exp10f.c b/src/math/exp10f.c
index c952141..7a8d447 100644 (file)
--- a/src/math/exp10f.c
+++ b/src/math/exp10f.c
@@ -1,17 +1,23 @@
 #define _GNU_SOURCE
 #include <math.h>
+#include <stdint.h>
+#include "libc.h"
 
 float exp10f(float x)
 {
        static const float p10[] = {
-               1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1,
+               1e-7f, 1e-6f, 1e-5f, 1e-4f, 1e-3f, 1e-2f, 1e-1f,
                1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7
        };
        float n, y = modff(x, &n);
-       if (fabsf(n) < 8) {
+       union {float f; uint32_t i;} u = {n};
+       /* fabsf(n) < 8 without raising invalid on nan */
+       if ((u.i>>23 & 0xff) < 0x7f+3) {
                if (!y) return p10[(int)n+7];
                y = exp2f(3.32192809488736234787031942948939f * y);
                return y * p10[(int)n+7];
        }
        return exp2(3.32192809488736234787031942948939 * x);
 }
+
+weak_alias(exp10f, pow10f);