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Unified Diff: fusl/src/math/round.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/round.c
diff --git a/fusl/src/math/round.c b/fusl/src/math/round.c
new file mode 100644
index 0000000000000000000000000000000000000000..130d58d2571e77cc15a67b355010e11c5ebebe91
--- /dev/null
+++ b/fusl/src/math/round.c
@@ -0,0 +1,35 @@
+#include "libm.h"
+
+#if FLT_EVAL_METHOD==0 || FLT_EVAL_METHOD==1
+#define EPS DBL_EPSILON
+#elif FLT_EVAL_METHOD==2
+#define EPS LDBL_EPSILON
+#endif
+static const double_t toint = 1/EPS;
+
+double round(double x)
+{
+ union {double f; uint64_t i;} u = {x};
+ int e = u.i >> 52 & 0x7ff;
+ double_t y;
+
+ if (e >= 0x3ff+52)
+ return x;
+ if (u.i >> 63)
+ x = -x;
+ if (e < 0x3ff-1) {
+ /* raise inexact if x!=0 */
+ FORCE_EVAL(x + toint);
+ return 0*u.f;
+ }
+ y = x + toint - toint - x;
+ if (y > 0.5)
+ y = y + x - 1;
+ else if (y <= -0.5)
+ y = y + x + 1;
+ else
+ y = y + x;
+ if (u.i >> 63)
+ y = -y;
+ return y;
+}
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