83Plus:BCALLs:408D

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