# Instructions - vs_1_1

This section contains reference information for the vertex shader version 1_1 instructions.

There are several types of vertex shader instructions, as shown in the table. Columns to the right mean the following:

- Instruction slots - Number of instruction slots used by each instruction.
- Setup - Non-arithmetic instructions. Every shader must have a version instruction and it must be the first instruction.
- Arithmetic - These instructions provide the mathematical operations in a shader.
- New - These instructions are new to this version.

## Instruction Set

Name | Description | Instruction slots | Setup | Arithmetic | New |
---|---|---|---|---|---|

add - vs | Add two vectors | 1 | x | x | |

dcl_usage input (sm1, sm2, sm3 - vs asm) | Declare input vertex registers (see Registers - vs_1_1) | 0 | x | x | |

def - vs | Define constants | 0 | x | x | |

dp3 - vs | Three-component dot product | 1 | x | x | |

dp4 - vs | Four-component dot product | 1 | x | x | |

dst - vs | Calculate the distance vector | 1 | x | x | |

exp - vs | Full precision 2x | 10 | x | x | |

exp - vs | Partial precision 2x | 1 | x | x | |

frc - vs | Fractional component | 3 | x | x | |

lit - vs | Partial lighting calculation | 1 | x | x | |

log - vs | Full precision log₂(x) | 10 | x | x | |

logp - vs | Partial precision log₂(x) | 1 | x | x | |

m3x2 - vs | 3x2 multiply | 2 | x | x | |

m3x3 - vs | 3x3 multiply | 3 | x | x | |

m3x4 - vs | 3x4 multiply | 4 | x | x | |

m4x3 - vs | 4x3 multiply | 3 | x | x | |

m4x4 - vs | 4x4 multiply | 4 | x | x | |

mad - vs | Multiply and add | 1 | x | x | |

max - vs | Maximum | 1 | x | x | |

min - vs | Minimum | 1 | x | x | |

mov - vs | Move | 1 | x | x | |

mul - vs | Multiply | 1 | x | x | |

nop - vs | No operation | 1 | x | x | |

rcp - vs | Reciprocal | 1 | x | x | |

rsq - vs | Reciprocal square root | 1 | x | x | |

sge - vs | Greater than or equal compare | 1 | x | x | |

slt - vs | Less than compare | 1 | x | x | |

sub - vs | Subtract | 1 | x | x | |

vs | Version | 0 | x | x |

## Related topics

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