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-rw-r--r--src/math/llrintl.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/src/math/llrintl.c b/src/math/llrintl.c
index ec2cf86b..f1cc47ed 100644
--- a/src/math/llrintl.c
+++ b/src/math/llrintl.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 long llrintl(long double x)
@@ -7,10 +9,22 @@ long long llrintl(long double x)
return llrint(x);
}
#else
-#define type long double
-#define roundit rintl
-#define dtype long long
-#define fn llrintl
+/*
+see comments in lrint.c
-#include "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)
+{
+ int e;
+
+ e = fetestexcept(FE_INEXACT);
+ x = rintl(x);
+ if (!e && (x > LLONG_MAX || x < LLONG_MIN))
+ feclearexcept(FE_INEXACT);
+ /* conversion */
+ return x;
+}
#endif