+/* 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
+
+// char __fsgt (float a, float b) __reentrant
+static void dummy(void) __naked
+{
+ __asm
+ .globl ___fsgt
+___fsgt:
+ mov r7, a
+ mov r0, sp
+ dec r0
+ dec r0
+ lcall fs_check_negative_zeros
+ setb sign_a
+ rlc a
+ mov a, @r0
+ jc a_negative
+a_positive:
+ jnb acc.7, ab_positive
+ // a is positive and b is negative, so a > b
+ mov dpl, #1
+ ret
+a_negative:
+ jb acc.7, ab_negative
+ // a is negative and b is positive, so a < b
+ mov dpl, #0
+ ret
+ab_positive:
+ clr sign_a
+ab_negative:
+ lcall fs_compare_uint32
+ mov a, r1
+ jnz ab_different
+ // a and b are equal
+ mov dpl, a
+ ret
+ab_different:
+ jnb sign_a, skip_invert
+ cpl c
+skip_invert:
+ clr a
+ rlc a
+ mov dpl, a
+ ret
+ __endasm;
+}
+
+#else
+
/*
** libgcc support for software floating point.
** Copyright (C) 1991 by Pipeline Associates, Inc. All rights reserved.
** 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))
+/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
union float_long
{
};
/* compare two floats */
-char
-__fsgt (float a1, float a2)
+char __fsgt (float a1, float a2)
{
volatile union float_long fl1, fl2;
fl1.f = a1;
fl2.f = a2;
- if (SIGN (fl1.l) && SIGN (fl2.l))
- {
- fl1.l ^= SIGNBIT;
- fl2.l ^= SIGNBIT;
- }
+ if (fl1.l<0 && fl2.l<0) {
+ if (fl2.l > fl1.l)
+ return (1);
+ return (0);
+ }
+
if (fl1.l > fl2.l)
return (1);
return (0);
}
+
+#endif