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Unified Diff: fusl/src/math/modff.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/modff.c
diff --git a/fusl/src/math/modff.c b/fusl/src/math/modff.c
new file mode 100644
index 0000000000000000000000000000000000000000..639514effafcc91997d53f4b8528e16b21440a9e
--- /dev/null
+++ b/fusl/src/math/modff.c
@@ -0,0 +1,34 @@
+#include "libm.h"
+
+float modff(float x, float *iptr)
+{
+ union {float f; uint32_t i;} u = {x};
+ uint32_t mask;
+ int e = (int)(u.i>>23 & 0xff) - 0x7f;
+
+ /* no fractional part */
+ if (e >= 23) {
+ *iptr = x;
+ if (e == 0x80 && u.i<<9 != 0) { /* nan */
+ return x;
+ }
+ u.i &= 0x80000000;
+ return u.f;
+ }
+ /* no integral part */
+ if (e < 0) {
+ u.i &= 0x80000000;
+ *iptr = u.f;
+ return x;
+ }
+
+ mask = 0x007fffff>>e;
+ if ((u.i & mask) == 0) {
+ *iptr = x;
+ u.i &= 0x80000000;
+ return u.f;
+ }
+ u.i &= ~mask;
+ *iptr = u.f;
+ return x - u.f;
+}
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