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Unified Diff: fusl/src/math/logb.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/logb.c
diff --git a/fusl/src/math/logb.c b/fusl/src/math/logb.c
new file mode 100644
index 0000000000000000000000000000000000000000..7f8bdfae19f8ca0a85b611d38a73695ccf588e43
--- /dev/null
+++ b/fusl/src/math/logb.c
@@ -0,0 +1,17 @@
+#include <math.h>
+
+/*
+special cases:
+ logb(+-0) = -inf, and raise divbyzero
+ logb(+-inf) = +inf
+ logb(nan) = nan
+*/
+
+double logb(double x)
+{
+ if (!isfinite(x))
+ return x * x;
+ if (x == 0)
+ return -1/(x*x);
+ return ilogb(x);
+}
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