* device/lib/pic/libsdcc/fsdiv.c,

[fw/sdcc] / device / lib / pic / libsdcc / fsdiv.c

diff --git a/device/lib/pic/libsdcc/fsdiv.c b/device/lib/pic/libsdcc/fsdiv.c
index 7b5b4f5039004bc2ff5262d7d4541fc2bd710876..beb6607d216a8cb8878071b376dca4fee173d355 100644 (file)
--- a/device/lib/pic/libsdcc/fsdiv.c
+++ b/device/lib/pic/libsdcc/fsdiv.c
@@ -1,99 +1,106 @@
-/*
-** 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: fsdiv.c 3513 2004-10-01 14:49:51Z vrokas $
-*/
-
-/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
-
-#include <float.h>
-
-union float_long
-  {
-    float f;
-    long l;
-  };
-
-/* divide two floats */
-float __fsdiv (float a1, float a2) _FS_REENTRANT
-{
-  FS_STATIC volatile union float_long fl1, fl2;
-  long result;
-  unsigned long mask;
-  long mant1, mant2;
-  int exp ;
-  char sign;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  /* subtract exponents */
-  exp = EXP (fl1.l) ;
-  exp -= EXP (fl2.l);
-  exp += EXCESS;
-
-  /* compute sign */
-  sign = SIGN (fl1.l) ^ SIGN (fl2.l);
-
-  /* divide by zero??? */
-  if (!fl2.l)
-    /* return NaN or -NaN */
-    return (-1.0);
-
-  /* numerator zero??? */
-  if (!fl1.l)
-    return (0);
-
-  /* now get mantissas */
-  mant1 = MANT (fl1.l);
-  mant2 = MANT (fl2.l);
-
-  /* this assures we have 25 bits of precision in the end */
-  if (mant1 < mant2)
-    {
-      mant1 <<= 1;
-      exp--;
-    }
-
-  /* now we perform repeated subtraction of fl2.l from fl1.l */
-  mask = 0x1000000;
-  result = 0;
-  while (mask)
-    {
-      if (mant1 >= mant2)
-       {
-         result |= mask;
-         mant1 -= mant2;
-       }
-      mant1 <<= 1;
-      mask >>= 1;
-    }
-
-  /* round */
-  result += 1;
-
-  /* normalize down */
-  exp++;
-  result >>= 1;
-
-  result &= ~HIDDEN;
-
-  /* pack up and go home */
-  fl1.l = PACK (sign ? 1ul<<31 : 0, (unsigned long) exp, result);
-  return (fl1.f);
-}
-
+/*\r
+** libgcc support for software floating point.\r
+** Copyright (C) 1991 by Pipeline Associates, Inc.  All rights reserved.\r
+** Permission is granted to do *anything* you want with this file,\r
+** commercial or otherwise, provided this message remains intact.  So there!\r
+** I would appreciate receiving any updates/patches/changes that anyone\r
+** makes, and am willing to be the repository for said changes (am I\r
+** making a big mistake?).\r
+**\r
+** Pat Wood\r
+** Pipeline Associates, Inc.\r
+** pipeline!phw@motown.com or\r
+** sun!pipeline!phw or\r
+** uunet!motown!pipeline!phw\r
+*/\r
+\r
+/*\r
+** $Id: fsdiv.c 3513 2004-10-01 14:49:51Z vrokas $\r
+*/\r
+\r
+/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */\r
+\r
+#include <float.h>\r
+\r
+union float_long\r
+  {\r
+    float f;\r
+    long l;\r
+  };\r
+\r
+/* divide two floats */\r
+float __fsdiv (float a1, float a2) _FS_REENTRANT\r
+{\r
+  FS_STATIC volatile union float_long fl1, fl2;\r
+  long result;\r
+  unsigned long mask;\r
+  long mant1, mant2;\r
+  int exp ;\r
+  char sign;\r
+\r
+  fl1.f = a1;\r
+  fl2.f = a2;\r
+\r
+  /* subtract exponents */\r
+  exp = EXP (fl1.l) ;\r
+  exp -= EXP (fl2.l);\r
+  exp += EXCESS;\r
+\r
+  /* compute sign */\r
+  sign = SIGN (fl1.l) ^ SIGN (fl2.l);\r
+\r
+  /* divide by zero??? */\r
+  if (!fl2.l)\r
+    {/* return NaN or -NaN */\r
+      fl2.l = 0x7FC00000;\r
+      return (fl2.f);\r
+    }\r
+\r
+  /* numerator zero??? */\r
+  if (!fl1.l)\r
+    return (0);\r
+\r
+  /* now get mantissas */\r
+  mant1 = MANT (fl1.l);\r
+  mant2 = MANT (fl2.l);\r
+\r
+  /* this assures we have 25 bits of precision in the end */\r
+  if (mant1 < mant2)\r
+    {\r
+      mant1 <<= 1;\r
+      exp--;\r
+    }\r
+\r
+  /* now we perform repeated subtraction of fl2.l from fl1.l */\r
+  mask = 0x1000000;\r
+  result = 0;\r
+  while (mask)\r
+    {\r
+      if (mant1 >= mant2)\r
+       {\r
+         result |= mask;\r
+         mant1 -= mant2;\r
+       }\r
+      mant1 <<= 1;\r
+      mask >>= 1;\r
+    }\r
+\r
+  /* round */\r
+  result += 1;\r
+\r
+  /* normalize down */\r
+  exp++;\r
+  result >>= 1;\r
+\r
+  result &= ~HIDDEN;\r
+\r
+  /* pack up and go home */\r
+  if (exp >= 0x100)\r
+    fl1.l = (sign ? SIGNBIT : 0) | 0x7F800000;\r
+  else if (exp < 0)\r
+    fl1.l = 0;\r
+  else\r
+    fl1.l = PACK (sign ? SIGNBIT : 0 , exp, result);\r
+  return (fl1.f);\r
+}\r
+\r