sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 97 insertions, 0 deletions

diff --git a/device/lib/_fs2schar.c b/device/lib/_fs2schar.c
new file mode 100644
index 0000000..3d990d3
--- /dev/null
+++ b/device/lib/_fs2schar.c
@@ -0,0 +1,97 @@
+/*-------------------------------------------------------------------------
+   _fs2schar.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
+
+// char __fs2schar (float x)
+static void dummy(void) __naked
+{
+        __asm
+        .globl  ___fs2schar
+___fs2schar:
+        lcall   ___fs2slong
+        jnz     fs2schar_not_zero
+        mov     a, dpl
+        orl     a, dph
+        orl     a, b
+        jnz     fs2schar_clr_a
+        ret
+fs2schar_clr_a:
+        clr a
+fs2schar_not_zero:
+        jnb     sign_a, fs2schar_pos
+fs2schar_neg:
+        cpl     a
+        jnz     fs2schar_maxval_neg
+        mov     a, b
+        cpl     a
+        jnz     fs2schar_maxval_neg
+        mov     a, dph
+        cpl     a
+        jnz     fs2schar_maxval_neg
+        mov     a, dpl
+        jnb     acc.7, fs2schar_maxval_neg
+        ret
+fs2schar_maxval_neg:
+        mov     dpl, #0x80
+        ret
+fs2schar_pos:
+        jnz     fs2schar_maxval_pos
+        mov     a, b
+        jnz     fs2schar_maxval_pos
+        mov     a, dph
+        jnz     fs2schar_maxval_pos
+        mov     a, dpl
+        jb      acc.7, fs2schar_maxval_pos
+        ret
+fs2schar_maxval_pos:
+        mov     dpl, #0x7F
+        ret
+        __endasm;
+}
+
+#else
+
+/* convert float to signed char */
+signed char __fs2schar (float f)
+{
+  signed long sl=__fs2slong(f);
+  if (sl>=SCHAR_MAX)
+    return SCHAR_MAX;
+  if (sl<=SCHAR_MIN)
+    return -SCHAR_MIN;
+  return sl;
+}
+
+#endif