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Unified Diff: fusl/src/math/ilogb.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/ilogb.c
diff --git a/fusl/src/math/ilogb.c b/fusl/src/math/ilogb.c
new file mode 100644
index 0000000000000000000000000000000000000000..64d40154d60ab065b8597d69faef4f76a2fac49d
--- /dev/null
+++ b/fusl/src/math/ilogb.c
@@ -0,0 +1,26 @@
+#include <limits.h>
+#include "libm.h"
+
+int ilogb(double x)
+{
+ #pragma STDC FENV_ACCESS ON
+ union {double f; uint64_t i;} u = {x};
+ uint64_t i = u.i;
+ int e = i>>52 & 0x7ff;
+
+ if (!e) {
+ i <<= 12;
+ if (i == 0) {
+ FORCE_EVAL(0/0.0f);
+ return FP_ILOGB0;
+ }
+ /* subnormal x */
+ for (e = -0x3ff; i>>63 == 0; e--, i<<=1);
+ return e;
+ }
+ if (e == 0x7ff) {
+ FORCE_EVAL(0/0.0f);
+ return i<<12 ? FP_ILOGBNAN : INT_MAX;
+ }
+ return e - 0x3ff;
+}
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