Loads two double-precision values into floating-point registers.
Note: The lfqx instruction is supported only in the POWER2 implementation of the POWER architecture.
| POWER2 | |
|---|---|
| lfqx | FRT,RA,RB |
The lfqx instruction loads the two doublewords from the location in memory specified by the effective address (EA) into two floating-point registers (FPR).
If general-purpose register (GPR) RA is not 0, the EA is the sum of the contents of GPR RA and GPR RB. If GPR RA is 0, the EA is the contents of GPR RB. The doubleword at the EA is loaded into FPR FRT. If FRT is 31, the doubleword at EA+8 is loaded into FPR 0; otherwise, it is loaded into FRT+1.
The lfqx instruction has one syntax form and does not affect the Floating-Point Status and Control Register or Condition Register Field 0.
The following code calculates the sum of two double-precision, floating-point values that are located in consecutive doublewords in memory:
# Assume GPR 3 contains the address of the first floating-point # value. # Assume GPR 4 contains the address of the target location. lfqx 7,0,3 # Load values into FPRs 7 and 8. fadd 7,7,8 # Add the two values. stfdx 7,0,4 # Store the doubleword result.
Floating-Point Load and Store Instructions.