lfs (Load Floating-Point Single) instruction
Purpose
Loads a floating-point, single-precision number that has been converted to a floating-point, double-precision number into a floating-point register.
Syntax
| Bits | Value |
|---|---|
| 0 - 5 | 48 |
| 6 - 10 | FRT |
| 11 - 15 | RA |
| 16 - 31 | D |
Description
The lfs instruction converts a floating-point, single-precision word in storage addressed by the effective address (EA) to a floating-point, double-precision word and loads the result into floating-point register (FPR) FRT.
If RA is not 0, the EA is the sum of the contents of GPR RA and D, a 16-bit, signed two's complement integer sign-extended to 32 bits. If RA is 0, then the EA is D.
The lfs instruction has one syntax form and does not affect the Floating-Point Status and Control Register or Condition Register Field 0.
Parameters
| Item | Description |
|---|---|
| FRT | Specifies target floating-point register where data is stored. |
| D | 16-bit, signed two's complement integer sign-extended to 32 bits for EA calculation. |
| RA | Specifies source general-purpose register for EA calculation. |
Examples
The following code loads the single-precision contents of storage into FPR 6:
.csect data[rw]
storage: .float 0x1
# Assume GPR 5 contains the address csect data[rw].
.csect text[pr]
lfs 6,storage(5)
# FPR 6 now contains 0x3FF0 0000 0000 0000.