sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 129 insertions, 0 deletions

diff --git a/device/lib/_fslt.c b/device/lib/_fslt.c
new file mode 100644
index 0000000..4059e26
--- /dev/null
+++ b/device/lib/_fslt.c
@@ -0,0 +1,129 @@
+/*-------------------------------------------------------------------------
+   _fslt.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 __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.
+** 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?).
+**
+** Pat Wood
+** Pipeline Associates, Inc.
+** pipeline!phw@motown.com or
+** sun!pipeline!phw or
+** uunet!motown!pipeline!phw
+*/
+
+/* (c)2000/2001: hacked a little by johan.knol@iduna.nl for sdcc */
+
+union float_long
+  {
+    float f;
+    long l;
+  };
+
+/* compare two floats */
+char __fslt (float a1, float a2)
+{
+  volatile union float_long fl1, fl2;
+
+  fl1.f = a1;
+  fl2.f = a2;
+
+  if (((fl1.l | fl2.l) & 0x7FFFFFFF) == 0)
+    return (0);
+
+  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