83Plus:BCALLs:408D
From WikiTI
Revision as of 07:26, 26 April 2005 by Dan Englender (Talk | contribs)
Synopsis
Official Name: InvOP1S
BCALL Address: 408D
Negates the floating point number in OP1.
Inputs
- OP1 = floating point number
Outputs
- OP1 = -OP1
Registers Destroyed
- AF
Comments
This routine inverts the sign bit of OP1 unless it is a floating point zero. If the value in OP1 is a floating point zero, then the sign bit is not inverted.
Example
B_CALL OP1Set3 ;OP1=floating point 3 B_CALL InvOP1S ;returns with OP1=-3
