lop3 GPU Virtual ISA NVIDIA

lop3 Logic and Shift Instructions

lop3.b32 d, a, b, c, immLut;

Compute bitwise logical operation on inputs a, b, c and store the result in destination d.

Encoding

PTX is a virtual instruction set. It has no single, stable native binary encoding - the compiler lowers this instruction to different native machine code depending on the selected NVIDIA target architecture (compute capability). This page intentionally shows no bit-diagram; see the target/version requirements below for what governs how this instruction compiles.
PTX ISA Version Introduced PTX ISA 4.3
Minimum Target sm_50

Syntax Forms

One mnemonic covers many type / state-space / scope / modifier combinations - each row below is an independently valid form.

Syntax Data Types State Space(s) Modifiers Min. Target Description
lop3.b32 d, a, b, c, immLut; sm_50 Compute bitwise logical operation on inputs a, b, c and store the result in destination d. Optionally,. (see the official PTX ISA docs for the full description)

Operands

  • d
    Destination register
  • a
    Source operand
  • b
    Source operand
  • c
    Source operand
  • immLut
    Operand

At a Glance

Data Types -

Related AMDGPU Concepts

Three-Input Bitwise Logic ↗
equivalent with restrictions
v_bitop3_b32 (AMDGPU)

Related

More in Logic and Shift Instructions

Reference

NVIDIA PTX ISA

Description

Compute bitwise logical operation on inputs a, b, c and store the result in destination d. Optionally,.BoolOp can be specified to compute the predicate result p by performing a Boolean operation on the destination operand d with the predicate q in the following manner: p = (d != 0) BoolOp q; The sink symbol ‘_’ may be used in place of the destination operand d when.BoolOp qualifier is specified. The logical operation is defined by a look-up table which, for 3 inputs, can be represented as an 8-bit value specified by operand immLut as described below. (see the official PTX ISA docs for the full description)

Semantics

F = GetFunctionFromTable(immLut); // returns the function corresponding to immLut value d = F(a, b, c); if (BoolOp specified) { p = (d != 0) BoolOp q; }

Examples

lop3.b32       d, a, b, c, 0x40;
lop3.or.b32  d|p, a, b, c, 0x3f, q;
lop3.and.b32 _|p, a, b, c, 0x3f, q;

Reproduced from NVIDIA's official PTX ISA documentation for technical accuracy.

Sources