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Unified Diff: fusl/src/math/llrintl.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/llrintl.c
diff --git a/fusl/src/math/llrintl.c b/fusl/src/math/llrintl.c
new file mode 100644
index 0000000000000000000000000000000000000000..3449f6f2b400944f64076270433144626d9eb4b5
--- /dev/null
+++ b/fusl/src/math/llrintl.c
@@ -0,0 +1,36 @@
+#include <limits.h>
+#include <fenv.h>
+#include "libm.h"
+
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long long llrintl(long double x)
+{
+ return llrint(x);
+}
+#elif defined(FE_INEXACT)
+/*
+see comments in lrint.c
+
+Note that if LLONG_MAX == 0x7fffffffffffffff && LDBL_MANT_DIG == 64
+then x == 2**63 - 0.5 is the only input that overflows and
+raises inexact (with tonearest or upward rounding mode)
+*/
+long long llrintl(long double x)
+{
+ #pragma STDC FENV_ACCESS ON
+ int e;
+
+ e = fetestexcept(FE_INEXACT);
+ x = rintl(x);
+ if (!e && (x > LLONG_MAX || x < LLONG_MIN))
+ feclearexcept(FE_INEXACT);
+ /* conversion */
+ return x;
+}
+#else
+long long llrintl(long double x)
+{
+ return rintl(x);
+}
+#endif
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