Assembler Language Reference

fabs (Floating Absolute Value) Instruction

Purpose

Stores the absolute value of the contents of a floating-point register in another floating-point register.

Syntax

Bits	Value
0-5	63
6-10	FRT
11-15	///
16-20	FRB
21-30	264
31	Rc

fabs	FRT, FRB
fabs.	FRT, FRB

Description

The fabs instruction sets bit 0 of floating-point register (FPR) FRB to 0 and places the result into FPR FRT.

The fabs instruction has two syntax forms. Each syntax form has a different effect on Condition Register Field 1.

Syntax Form	Floating-Point Status and Control Register	Record Bit (Rc)	Condition Register Field 1
fabs	None	0	None
fabs.	None	1	FX,FEX,VX,OX

The two syntax forms of the fabs instruction never affect the Floating-Point Status and Control Register. If the syntax form sets the Record (Rc) bit to 1, the instruction affects the Floating-Point Exception Summary (FX), Floating-Point Enabled Exception Summary (FEX), Floating-Point Invalid Operation Exception Summary (VX), and Floating-Point Overflow Exception (OX) bits in Condition Register Field 1.

Parameters

FRT	Specifies target floating-point register for operation.
FRB	Specifies source floating-point register for operation.

Examples

The following code sets bit 0 of FPR 4 to zero and place sthe result in FPR 6:

# Assume FPR 4 holds 0xC053 4000 0000 0000.
fabs 6,4
# GPR 6 now holds 0x4053 4000 0000 0000.

The following code sets bit 0 of FPR 25 to zero, places the result in FPR 6, and sets Condition Register Field 1 to reflect the result of the operation:
```
# Assume FPR 25 holds 0xFFFF FFFF FFFF FFFF.
fabs. 6,25
# GPR 6 now holds 0x7FFF FFFF FFFF FFFF.
```

Related Information

Floating-Point Processor .

Floating-Point Move Instructions .

Interpreting the Contents of a Floating-Point Register .