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108 lines
1.7 KiB
NASM
108 lines
1.7 KiB
NASM
*
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* Test an extended to see whether it is NaN or INF
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*
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* $Id: fpspecnum.asm,v 1.1 1997/09/05 06:31:59 gdr Exp $
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*
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* Soenke Behrens, August 1997
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*
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case on
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mcopy fpspecnum.mac
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*
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* Dummy function to take care of fpspecnum.root, which
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* can then be discarded.
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*
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dummy start
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copy :lib:ainclude:e16.sane ; Apple-supplied SANE EQUs
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end
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****************************************************************
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*
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* int _isnan (extended x);
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*
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* Check whether x is NaN, if so, return 1, otherwise, return 0.
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*
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****************************************************************
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*
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_isnan start libc_stdlib
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result equ 1
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space equ result+2
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csub (10:x),space
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short m clear the specific NaN code
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stz x+6
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long m
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lda x and do the compare
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cmp nan_x
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bne diff
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lda x+2
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cmp nan_x+2
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bne diff
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lda x+4
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cmp nan_x+4
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bne diff
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lda x+6
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cmp nan_x+6
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bne diff
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lda x+8
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cmp nan_x+8
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bne diff
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lda #1
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sta result
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bra bye
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diff stz result
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bye ret (2:result)
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nan_x dc h'0000000000000040FF7F' ; Hex encoding of a NaN
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end
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****************************************************************
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*
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* int _isinf (extended x);
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*
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* Check whether x is INF, if so, return 1, otherwise, return 0.
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*
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****************************************************************
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*
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_isinf start libc_stdlib
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result equ 1
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space equ result+2
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csub (10:x),space
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short m
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lda x+9 get rid of sign bit
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and #%01111111
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sta x+9
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long m
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lda x and do the compare
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cmp inf_x
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bne diff
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lda x+2
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cmp inf_x+2
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bne diff
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lda x+4
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cmp inf_x+4
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bne diff
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lda x+6
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cmp inf_x+6
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bne diff
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lda x+8
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cmp inf_x+8
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bne diff
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lda #1
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sta result
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bra bye
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diff stz result
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bye ret (2:result)
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inf_x dc h'0000000000000000FF7F' ; Hex encoding of +INF
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end
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