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# 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

NameDescriptionInstruction slotsSetupArithmeticNew
add - vs Add two vectors1xx
dcl_usage input (sm1, sm2, sm3 - vs asm) Declare input vertex registers (see Registers - vs_1_1)0xx
def - vs Define constants0xx
dp3 - vs Three-component dot product1xx
dp4 - vs Four-component dot product1xx
dst - vs Calculate the distance vector1xx
exp - vs Full precision 2x10xx
exp - vs Partial precision 2x1xx
frc - vs Fractional component3xx
lit - vs Partial lighting calculation1xx
log - vs Full precision log₂(x)10xx
logp - vs Partial precision log₂(x)1xx
m3x2 - vs 3x2 multiply2xx
m3x3 - vs 3x3 multiply3xx
m3x4 - vs 3x4 multiply4xx
m4x3 - vs 4x3 multiply3xx
m4x4 - vs 4x4 multiply4xx
mad - vs Multiply and add1xx
max - vs Maximum1xx
min - vs Minimum1xx
mov - vs Move1xx
mul - vs Multiply1xx
nop - vs No operation1xx
rcp - vs Reciprocal1xx
rsq - vs Reciprocal square root1xx
sge - vs Greater than or equal compare1xx
slt - vs Less than compare1xx
sub - vs Subtract1xx
vs Version0xx

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