sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 115 insertions, 0 deletions

diff --git a/device/lib/_ulong2fs.c b/device/lib/_ulong2fs.c
new file mode 100644
index 0000000..d3ddbdf
--- /dev/null
+++ b/device/lib/_ulong2fs.c
@@ -0,0 +1,115 @@
+/*-------------------------------------------------------------------------
+   _ulong2fs.c - Floating point library in optimized assembly for 8051
+
+   Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
+
+   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.
+-------------------------------------------------------------------------*/
+
+
+#define __SDCC_FLOAT_LIB
+#include <float.h>
+
+
+#ifdef FLOAT_ASM_MCS51
+
+// float long __ulong2fs (float x)
+static void dummy(void) __naked
+{
+	__asm
+	.globl	___ulong2fs
+___ulong2fs:
+	mov	r4, a
+	mov	r3, b
+	mov	r2, dph
+	mov	r1, dpl
+	mov	a, #158
+	.globl	ulong2fs_doit
+ulong2fs_doit:
+	clr	sign_a
+long2fs_doit:
+	mov	exp_a, a
+	lcall	fs_normalize_a
+	ljmp	fs_round_and_return
+	__endasm;
+}
+
+#else
+
+/*
+** 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
+*/
+
+/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
+
+union float_long
+  {
+    float f;
+    long l;
+  };
+
+float __ulong2fs (unsigned long a )
+{
+  unsigned char exp = 24 + EXCESS;
+  volatile union float_long fl;
+
+  if (!a)
+    {
+      return 0.0;
+    }
+
+  while (a < HIDDEN)
+    {
+      a <<= 1;
+      exp--;
+    }
+
+  while (a & NORM) 
+    {
+      // we lose accuracy here
+      if (a & 1)
+        a += 2;
+      a >>= 1;
+      exp++;
+    }
+  
+  a &= ~HIDDEN ;
+  /* pack up and go home */
+  fl.l = PACK(0,(unsigned long)exp, a);
+
+  return (fl.f);
+}
+
+#endif