Added mcs51 assembly float lib functions (add, sub, mul, div

[fw/sdcc] / device / lib / _fslt.c

diff --git a/device/lib/_fslt.c b/device/lib/_fslt.c
index 510d6352126cc2c87c47f9d84dec8dcfffbcb2b7..b5e4311f0a90b07c6532e22835847f158fed6d6f 100644 (file)
--- a/device/lib/_fslt.c
+++ b/device/lib/_fslt.c
@@ -1,3 +1,77 @@
+/* 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 __fslt (float a, float b)
+static void dummy(void) _naked
+{
+       _asm
+       .globl  ___fslt
+___fslt:
+       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, #0
+       ret
+a_negative:
+       jb      acc.7, ab_negative
+       // a is negative and b is positive, so a < b
+       mov     dpl, #1
+       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:
+       jb      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.
@@ -16,7 +90,6 @@
 
 /* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
 
-#include <float.h>
 
 union float_long
   {
@@ -42,3 +115,6 @@ char __fslt (float a1, float a2)
     return (1);
   return (0);
 }
+
+#endif
+