* .version: bumped version number to 2.4.5

[fw/sdcc] / device / lib / pic16 / libsdcc / float / ulong2fs.c

diff --git a/device/lib/pic16/libsdcc/float/ulong2fs.c b/device/lib/pic16/libsdcc/float/ulong2fs.c
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..90322f28fc454c969872e5321baf7a8638a8023a 100644 (file)
--- a/device/lib/pic16/libsdcc/float/ulong2fs.c
+++ b/device/lib/pic16/libsdcc/float/ulong2fs.c
@@ -0,0 +1,75 @@
+/*
+** libgcc support for software floating point.
+** Copyright (C) 1991 by Pipeline Associates, Inc.  All rights reserved.
+** Permission is granted to do *anything* you want with this file,
+** commercial or otherwise, provided this message remains intact.  So there!
+** I would appreciate receiving any updates/patches/changes that anyone
+** makes, and am willing to be the repository for said changes (am I
+** making a big mistake?).
+**
+** Pat Wood
+** Pipeline Associates, Inc.
+** pipeline!phw@motown.com or
+** sun!pipeline!phw or
+** uunet!motown!pipeline!phw
+*/
+
+/*
+** $Id$
+*/
+
+/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
+
+#include <float.h>
+
+union float_long
+  {
+    float f;
+    long l;
+  };
+
+float __ulong2fs (unsigned long a ) _FS_REENTRANT
+{
+  int exp = 24 + EXCESS;
+  volatile union float_long fl;
+
+  if (!a)
+    {
+      return 0.0;
+    }
+
+  while (a & NORM) 
+    {
+      // we lose accuracy here
+      a >>= 1;
+      exp++;
+    }
+  
+
+  if(a < HIDDEN) {
+       do {
+               a<<=1;
+               exp--;
+       } while (a > HIDDEN);
+  }
+
+#if 0
+  while (a < HIDDEN) {
+      a <<= 1;
+      exp--;
+    }
+#endif
+
+#if 1
+  if ((a&0x7fffff)==0x7fffff) {
+    a=0;
+    exp++;
+  }
+#endif
+
+  a &= ~HIDDEN ;
+  /* pack up and go home */
+  fl.l = PACK(0,(unsigned long)exp, a);
+
+  return (fl.f);
+}