slct GPU Virtual ISA NVIDIA

slct Comparison and Selection Instructions

slct.dtype.s32 d, a, b, c;

Conditional selection.

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 1.0
Minimum Target sm_13

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
slct.dtype.s32 d, a, b, c; sm_13 Conditional selection. If c >= 0, a is stored in d, otherwise b is stored in d. (see the official PTX ISA docs for the full description)

Operands

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

At a Glance

Data Types -

Related

More in Comparison and Selection Instructions

Reference

NVIDIA PTX ISA

Description

Conditional selection. If c >= 0, a is stored in d, otherwise b is stored in d. Operands d, a, and b are treated as a bitsize type of the same width as the first instruction type; operand c must match the second instruction type (.s32 or.f32 ). The selected input is copied to the output without modification.

Semantics

d = (c >= 0) ? a : b;

Examples

slct.u32.s32  x, y, z, val;
slct.ftz.u64.f32  A, B, C, fval;

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

Sources