sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 115 insertions, 0 deletions

diff --git a/device/lib/_fsreturnval.c b/device/lib/_fsreturnval.c
new file mode 100644
index 0000000..f2d3aa9
--- /dev/null
+++ b/device/lib/_fsreturnval.c
@@ -0,0 +1,115 @@
+/*-------------------------------------------------------------------------
+   _fsreturnval.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
+
+static void dummy(void) __naked
+{
+	__asm
+
+	.globl	fs_round_and_return
+fs_round_and_return:
+#ifdef FLOAT_FULL_ACCURACY
+	// discard the extra 8 bits of precision we kept around in r1
+	cjne	r1, #128, 00001$
+	mov	a, r2
+	rrc	a
+	cpl	c
+00001$:
+	jc	fs_zerocheck_return
+	mov	a, r2
+	add	a, #1
+	mov	r2, a
+	clr	a
+	addc	a, r3
+	mov	r3, a
+	clr	a
+	addc	a, r4
+	mov	r4, a
+	jnc	fs_zerocheck_return
+	mov	r4, #0x80
+	inc	exp_a
+#endif
+
+	.globl	fs_zerocheck_return
+fs_zerocheck_return:
+	// zero output is a special case
+	cjne	r4, #0, fs_direct_return
+	cjne	r3, #0, fs_direct_return
+	cjne	r2, #0, fs_direct_return
+
+	.globl	fs_return_zero
+fs_return_zero:
+	clr	a
+	mov	b, a
+	mov	dph, a
+	mov	dpl, a
+	ret
+
+	.globl	fs_direct_return
+fs_direct_return:
+	// collect all pieces and return
+	mov	c, sign_a
+	mov	a, exp_a
+	rrc	a
+	mov	b, r4
+	mov	b.7, c
+	mov	dph, r3
+	mov	dpl, r2
+	ret
+
+	.globl	fs_return_inf
+fs_return_inf:
+	clr	a
+	mov	dph, a
+	mov	dpl, a
+	mov	b, #0x80
+	cpl	a
+	mov	c, sign_a
+	rrc	a
+	ret
+
+	.globl	fs_return_nan
+fs_return_nan:
+	clr	a
+	mov	dph, a
+	mov	dpl, a
+	mov	b, #0xC0
+	mov	a, #0x7F
+	ret
+
+	__endasm;
+}
+
+#endif