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The Very Best of Atari Inside
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1992-12-12
|
510b
|
23 lines
| double floating point negation routine
|
| written by Kai-Uwe Bloem (I5110401@dbstu1.bitnet).
| Based on a 80x86 floating point packet from comp.os.minix, written by P.Housel
|
|
| Revision 1.1, kub 12-89 :
| Created single float version for 68000
|
| Revision 1.0:
| original 8088 code from P.S.Housel for double floats
.text
.even
.globl __negsf2, ___negsf2
__negsf2: | floating point negate
___negsf2:
movel sp@(4),d0 | do not negate if operand is 0.0
beq 0f
bchg #31,d0 | flip sign bit
0: rts