summaryrefslogtreecommitdiff
path: root/src/math/__fpclassify.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/math/__fpclassify.c')
-rw-r--r--src/math/__fpclassify.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/src/math/__fpclassify.c b/src/math/__fpclassify.c
new file mode 100644
index 00000000..16051100
--- /dev/null
+++ b/src/math/__fpclassify.c
@@ -0,0 +1,14 @@
+#include <stdint.h>
+#include <math.h>
+
+int __fpclassify(double __x)
+{
+ union {
+ double __d;
+ __uint64_t __i;
+ } __y = { __x };
+ int __ee = __y.__i>>52 & 0x7ff;
+ if (!__ee) return __y.__i<<1 ? FP_SUBNORMAL : FP_ZERO;
+ if (__ee==0x7ff) return __y.__i<<12 ? FP_NAN : FP_INFINITE;
+ return FP_NORMAL;
+}