sub GPU Virtual ISA NVIDIA

Subtract Arithmetic

sub.type d, a, b;

Subtract the second operand from the first, with optional saturation for signed 32-bit integers.

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_10

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
sub.type d, a, b; s16, s32, s64, u16, u32, u64, f32, f64 sm_10 Generic subtract across integer and floating-point types.
sub.sat.s32 d, a, b; s32 sat sm_10 Signed 32-bit subtract with saturation.

Operands

  • d
    Destination register
  • a
    Minuend
  • b
    Subtrahend

At a Glance

Data Types f32, f64, s16, s32, s64, u16, u32, u64
Modifiers sat

Reference

NVIDIA PTX ISA

Semantics

d = a - b.

Sources