1 files changed, 68 insertions, 0 deletions
diff --git a/newlib/libm/common/s_llround.c b/newlib/libm/common/s_llround.c
new file mode 100644
index 000000000..923f885ca
--- /dev/null
+++ b/newlib/libm/common/s_llround.c
@@ -0,0 +1,68 @@
+/* lround adapted to be llround for Newlib, 2009 by Craig Howland.  */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#include "fdlibm.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+long long int
+llround(double x)
+{
+  __int32_t sign, exponent_less_1023;
+  /* Most significant word, least significant word. */
+  __uint32_t msw, lsw;
+  long long int result;
+  
+  EXTRACT_WORDS(msw, lsw, x);
+
+  /* Extract sign. */
+  sign = ((msw & 0x80000000) ? -1 : 1);
+  /* Extract exponent field. */
+  exponent_less_1023 = ((msw & 0x7ff00000) >> 20) - 1023;
+  msw &= 0x000fffff;
+  msw |= 0x00100000;
+
+  if (exponent_less_1023 < 20)
+    {
+      if (exponent_less_1023 < 0)
+        {
+          if (exponent_less_1023 < -1)
+            return 0;
+          else
+            return sign;
+        }
+      else
+        {
+          msw += 0x80000 >> exponent_less_1023;
+          result = msw >> (20 - exponent_less_1023);
+        }
+    }
+  else if (exponent_less_1023 < (8 * sizeof (long long int)) - 1)
+    {
+      if (exponent_less_1023 >= 52)
+        result = ((long long int) msw << (exponent_less_1023 - 20)) | (lsw << (exponent_less_1023 - 52));
+      else
+        {
+          unsigned int tmp = lsw + (0x80000000 >> (exponent_less_1023 - 20));
+          if (tmp < lsw)
+            ++msw;
+          result = ((long long int) msw << (exponent_less_1023 - 20)) | (tmp >> (52 - exponent_less_1023));
+        }
+    }
+  else
+    /* Result is too large to be represented by a long long int. */
+    return (long long int)x;
+
+  return sign * result;
+}
+
+#endif /* _DOUBLE_IS_32BITS */