X-Git-Url: https://git.gag.com/?a=blobdiff_plain;ds=sidebyside;f=device%2Flib%2F_fslt.c;h=b5e4311f0a90b07c6532e22835847f158fed6d6f;hb=f1007d04010ff2955d4d962c89616311ff4719d6;hp=510d6352126cc2c87c47f9d84dec8dcfffbcb2b7;hpb=095a5ba9b6e64697315954c9e489aa8ebf1a3aed;p=fw%2Fsdcc

diff --git a/device/lib/_fslt.c b/device/lib/_fslt.c
index 510d6352..b5e4311f 100644
--- 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
+