-/*
-** 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?).
-
-Warning! Only single-precision is actually implemented. This file
-won't really be much use until double-precision is supported.
-
-However, once that is done, this file might eventually become a
-replacement for libgcc1.c. It might also make possible
-cross-compilation for an IEEE target machine from a non-IEEE
-host such as a VAX.
-
-If you'd like to work on completing this, please talk to rms@gnu.ai.mit.edu.
-
-
-**
-** Pat Wood
-** Pipeline Associates, Inc.
-** pipeline!phw@motown.com or
-** sun!pipeline!phw or
-** uunet!motown!pipeline!phw
-**
-** 05/01/91 -- V1.0 -- first release to gcc mailing lists
-** 05/04/91 -- V1.1 -- added float and double prototypes and return values
-** -- fixed problems with adding and subtracting zero
-** -- fixed rounding in truncdfsf2
-** -- fixed SWAP define and tested on 386
-*/
-
-/*
-** The following are routines that replace the libgcc soft floating point
-** routines that are called automatically when -msoft-float is selected.
-** The support single and double precision IEEE format, with provisions
-** for byte-swapped machines (tested on 386). Some of the double-precision
-** routines work at full precision, but most of the hard ones simply punt
-** and call the single precision routines, producing a loss of accuracy.
-** long long support is not assumed or included.
-** Overall accuracy is close to IEEE (actually 68882) for single-precision
-** arithmetic. I think there may still be a 1 in 1000 chance of a bit
-** being rounded the wrong way during a multiply. I'm not fussy enough to
-** bother with it, but if anyone is, knock yourself out.
-**
-** Efficiency has only been addressed where it was obvious that something
-** would make a big difference. Anyone who wants to do this right for
-** best speed should go in and rewrite in assembler.
-**
-** I have tested this only on a 68030 workstation and 386/ix integrated
-** in with -msoft-float.
-*/
-
-/* the following deal with IEEE single-precision numbers */
-#define EXCESS 126
-#define SIGNBIT ((unsigned long)0x80000000)
-#define HIDDEN (unsigned long)(1 << 23)
-#define SIGN(fp) ((fp >> (8*sizeof(fp)-1)) & 1)
-#define EXP(fp) (((fp) >> 23) & (unsigned int) 0x00FF)
-#define MANT(fp) (((fp) & (unsigned long) 0x007FFFFF) | HIDDEN)
-#define PACK(s,e,m) ((s) | ((e) << 23) | (m))
-
-union float_long
- {
- float f;
- long l;
- };
-
-/* convert double to int */
-unsigned int
-__fs2uint (float a1)
+/* Floating point library in optimized assembly for 8051
+ * Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, 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 program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define SDCC_FLOAT_LIB
+#include <float.h>
+
+
+#ifdef FLOAT_ASM_MCS51
+
+// unsigned int __fs2uint (float x)
+static void dummy(void) __naked
{
- volatile union float_long fl1;
- volatile int exp;
- volatile long l;
-
- fl1.f = a1;
-
- if (!fl1.l)
- return (0);
-
- exp = EXP (fl1.l) - EXCESS - 24;
- l = MANT (fl1.l);
+ __asm
+ .globl ___fs2uint
+___fs2uint:
+ mov r7, #142
+ lcall fs2ulong_begin
+ mov dph, a
+ mov dpl, b
+ ret
+ __endasm;
+}
- if (exp > 0)
- return (0x7F | SIGN(fl1.l)); /* largest integer */
+#else
- /* shift down until exp = 0 or l = 0 */
- if (exp < 0 && exp > -25 && l)
- l >>= -exp;
- else
- return (0);
+unsigned long __fs2ulong (float a1);
- return (SIGN(fl1.l) ? -l : l);
+/* convert float to unsigned int */
+unsigned int __fs2uint (float f)
+{
+ unsigned long ul=__fs2ulong(f);
+ if (ul>=UINT_MAX) return UINT_MAX;
+ return ul;
}
+
+#endif
projects / fw / sdcc / blobdiff