1 files changed, 108 insertions, 0 deletions
diff --git a/newlib/libm/common/s_llrint.c b/newlib/libm/common/s_llrint.c
new file mode 100644
index 000000000..2239c4667
--- /dev/null
+++ b/newlib/libm/common/s_llrint.c
@@ -0,0 +1,108 @@
+/* lrint adapted to be llrint for Newlib, 2009 by Craig Howland.  */
+/* @(#)s_lrint.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * llrint(x)
+ * Return x rounded to integral value according to the prevailing
+ * rounding mode.
+ * Method:
+ *	Using floating addition.
+ * Exception:
+ *	Inexact flag raised if x not equal to llrint(x).
+ */
+
+#include "fdlibm.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+static const double
+#else
+static double 
+#endif
+
+/* Adding a double, x, to 2^52 will cause the result to be rounded based on
+   the fractional part of x, according to the implementation's current rounding
+   mode.  2^52 is the smallest double that can be represented using all 52 significant
+   digits. */
+TWO52[2]={
+  4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
+ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
+};
+
+long long int
+#ifdef __STDC__
+	llrint(double x)
+#else
+	llrint(x)
+	double x;
+#endif
+{
+  __int32_t i0,j0,sx;
+  __uint32_t i1;
+  double t;
+  volatile double w;
+  long long int result;
+  
+  EXTRACT_WORDS(i0,i1,x);
+
+  /* Extract sign bit. */
+  sx = (i0>>31)&1;
+
+  /* Extract exponent field. */
+  j0 = ((i0 & 0x7ff00000) >> 20) - 1023;
+  
+  if(j0 < 20)
+    {
+      if(j0 < -1)
+        return 0;
+      else
+        {
+          w = TWO52[sx] + x;
+          t = w - TWO52[sx];
+          GET_HIGH_WORD(i0, t);
+          /* Detect the all-zeros representation of plus and
+             minus zero, which fails the calculation below. */
+          if ((i0 & ~(1 << 31)) == 0)
+              return 0;
+          j0 = ((i0 & 0x7ff00000) >> 20) - 1023;
+          i0 &= 0x000fffff;
+          i0 |= 0x00100000;
+          result = i0 >> (20 - j0);
+        }
+    }
+  else if (j0 < (int)(8 * sizeof (long long int)) - 1)
+    {
+      if (j0 >= 52)
+        result = ((long long int) ((i0 & 0x000fffff) | 0x0010000) << (j0 - 20)) | 
+                   (i1 << (j0 - 52));
+      else
+        {
+          w = TWO52[sx] + x;
+          t = w - TWO52[sx];
+          EXTRACT_WORDS (i0, i1, t);
+          j0 = ((i0 & 0x7ff00000) >> 20) - 1023;
+          i0 &= 0x000fffff;
+          i0 |= 0x00100000;
+          result = ((long long int) i0 << (j0 - 20)) | (i1 >> (52 - j0));
+        }
+    }
+  else
+    {
+      return (long long int) x;
+    }
+  
+  return sx ? -result : result;
+}
+
+#endif /* _DOUBLE_IS_32BITS */