86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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_fsget2args.c - Floating point library in optimized assembly for 8051
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Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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As a special exception, if you link this library with other files,
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some of which are compiled with SDCC, to produce an executable,
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this library does not by itself cause the resulting executable to
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be covered by the GNU General Public License. This exception does
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not however invalidate any other reasons why the executable file
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might be covered by the GNU General Public License.
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-------------------------------------------------------------------------*/
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#define __SDCC_FLOAT_LIB
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#include <float.h>
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#ifdef FLOAT_ASM_MCS51
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static void dummy(void) __naked
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{
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// arg1: passed in a,b,dph,dpl
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// arg2: passed on stack
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__asm
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.globl fsgetargs
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fsgetargs:
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// extract the two inputs, placing them into:
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// sign exponent mantissa
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// ---- -------- --------
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// a: sign_a exp_a r4/r3/r2
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// b: sign_b exp_b r7/r6/r5
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//
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mov r2, dpl
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mov r3, dph
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mov c, b.7
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rlc a
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mov sign_a, c
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mov exp_a, a
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jz 00001$
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setb b.7
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00001$:
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mov r4, b
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// now extract the 2nd parameter from the stack
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mov a, sp
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add a, #249
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mov r0, a
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mov a, @r0
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mov r5, a
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inc r0
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mov a, @r0
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mov r6, a
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inc r0
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mov b, @r0
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inc r0
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mov a, @r0
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mov c, b.7
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rlc a
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mov sign_b, c
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mov exp_b, a
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jz 00002$
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setb b.7
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00002$:
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mov r7, b
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ret
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__endasm;
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}
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#endif
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