fmr (Floating Move Register) instruction

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Purpose

Copies the contents of one floating-point register into another floating-point register.

Syntax

Bits Value
0-5 63
6-10 FRT
11-15 ///
16-20 FRB
21-30 72
31 Rc
Item Description
fmr FRT, FRB
fmr. FRT, FRB

Description

The fmr instruction places the contents of floating-point register (FPR) FRB into the target FPR FRT.

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

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

The two syntax forms of the fmr 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 (FX), Floating-Point Enabled Exception (FEX), Floating-Point Invalid Operation Exception (VX), and Floating-Point Overflow Exception (OX) bits in Condition Register Field 1.

Parameters

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

Examples

  1. The following code copies the contents of FPR 4 into FPR 6 and sets the Floating-Point Status and Control Register to reflect the result of the operation: 
    
# Assume FPR 4 contains 0xC053 4000 0000 0000.
# Assume FPSCR = 0.
fmr 6,4
# FPR 6 now contains 0xC053 4000 0000 0000.
# FPSCR now contains 0x0000 0000.
  2. The following code copies the contents of FPR 25 into FPR 6 and sets the Floating-Point Status and Control Register and Condition Register Field 1 to reflect the result of the operation: 
    
# Assume FPR 25 contains 0xFFFF FFFF FFFF FFFF.
# Assume FPSCR = 0 and CR = 0.
fmr. 6,25
# FPR 6 now contains 0xFFFF FFFF FFFF FFFF.
# FPSCR now contains 0x0000 0000.
# CR now contains 0x0000 0000.