sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 63 insertions, 0 deletions

diff --git a/device/lib/_modulonglong.c b/device/lib/_modulonglong.c
new file mode 100644
index 0000000..77d14b7
--- /dev/null
+++ b/device/lib/_modulonglong.c
@@ -0,0 +1,63 @@
+/*-------------------------------------------------------------------------
+   _modulonglong.c - routine for modulus of 64 bit unsigned long long
+
+   Copyright (C) 1999, Sandeep Dutta . sandeep.dutta@usa.net
+   Bug fixes by Martijn van Balen, aed@iae.nl
+   Copyright (C) 2014, Philipp Klaus Krause . pkk@spth.de
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License 
+   along with this library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+#include <stdint.h>
+
+#ifdef __SDCC_LONGLONG
+
+#define MSB_SET(x) ((x >> (8*sizeof(x)-1)) & 1)
+
+unsigned long long
+_modulonglong (unsigned long long a, unsigned long long b)
+{
+  unsigned char count = 0;
+
+  while (!MSB_SET(b))
+  {
+     b <<= 1;
+     if (b > a)
+     {
+        b >>=1;
+        break;
+     }
+     count++;
+  }
+  do
+  {
+    if (a >= b)
+      a -= b;
+    b >>= 1;
+  }
+  while (count--);
+
+  return a;
+}
+#endif
+