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Unified Diff: fusl/src/math/exp10f.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/math/exp10f.c
diff --git a/fusl/src/math/exp10f.c b/fusl/src/math/exp10f.c
new file mode 100644
index 0000000000000000000000000000000000000000..7a8d447033eb73d7456cff6ab95d813f28e015ca
--- /dev/null
+++ b/fusl/src/math/exp10f.c
@@ -0,0 +1,23 @@
+#define _GNU_SOURCE
+#include <math.h>
+#include <stdint.h>
+#include "libc.h"
+
+float exp10f(float x)
+{
+ static const float p10[] = {
+ 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);
+ 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);
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