faster lrint and llrint functions

[musl] / src / math / lrintl.c

diff --git a/src/math/lrintl.c b/src/math/lrintl.c
index c076326..0e579bc 100644 (file)
--- a/src/math/lrintl.c
+++ b/src/math/lrintl.c
@@ -1,5 +1,7 @@
-#include <math.h>
-#include <float.h>
+#include <limits.h>
+#include <fenv.h>
+#include "libm.h"
+
 
 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
 long lrintl(long double x)
@@ -7,10 +9,22 @@ long lrintl(long double x)
        return lrint(x);
 }
 #else
-#define type            long double
-#define roundit         rintl
-#define dtype           long
-#define fn              lrintl
+/*
+see comments in lrint.c
 
-#include "lrint.c"
+Note that if LONG_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 lrintl(long double x)
+{
+       int e;
+
+       e = fetestexcept(FE_INEXACT);
+       x = rintl(x);
+       if (!e && (x > LONG_MAX || x < LONG_MIN))
+               feclearexcept(FE_INEXACT);
+       /* conversion */
+       return x;
+}
 #endif