* .version: bumped version number to 2.4.5

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

diff --git a/device/lib/pic16/libsdcc/float/fssub.c b/device/lib/pic16/libsdcc/float/fssub.c
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..a69e33269e1134d9f60f28193880cd8d40d927a9 100644 (file)
--- a/device/lib/pic16/libsdcc/float/fssub.c
+++ b/device/lib/pic16/libsdcc/float/fssub.c
@@ -0,0 +1,48 @@
+/*
+** 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;
+  };
+
+/* subtract two floats */
+float __fssub (float a1, float a2) _FS_REENTRANT
+{
+  volatile union float_long fl1, fl2;
+
+  fl1.f = a1;
+  fl2.f = a2;
+
+  /* check for zero args */
+  if (!fl2.l)
+    return (fl1.f);
+  if (!fl1.l)
+    return (-fl2.f);
+
+  /* twiddle sign bit and add */
+  fl2.l ^= SIGNBIT;
+  return fl1.f + fl2.f; 
+}