imm4 — LLVM 8 documentation

# imm4

A positive integer_number. The value is truncated to 4 bits.

This operand is a mask which controls indexing mode for operands of subsequent instructions. Value 1 enables indexing and value 0 disables it.

> Bit | Meaning
> --- | ---
> 0 | Enables or disables src0 indexing.
> 1 | Enables or disables src1 indexing.
> 2 | Enables or disables src2 indexing.
> 3 | Enables or disables dst indexing.