Syntax of gfx908 Instructions — LLVM 21.1.8 documentation

# Syntax of gfx908 Instructions

## Introduction

This document describes the syntax of instructions specific to gfx908.

For a description of other gfx908 instructions, see Syntax of Core GFX9 Instructions.

## Notation

Notation used in this document is explained here.

## Overview

An overview of generic syntax and other features of AMDGPU instructions may be found in this document.

## Instructions

### FLAT

    INSTRUCTION                    SRC0      SRC1      SRC2           MODIFIERS
    ———————————————————————————————————————————————————————————————————————————————
    global_atomic_add_f32          vaddr,    vdata,    saddr          offset13s slc
    global_atomic_pk_add_f16       vaddr,    vdata,    saddr          offset13s slc

### MUBUF

    INSTRUCTION                    SRC0      SRC1      SRC2      SRC3           MODIFIERS
    ————————————————————————————————————————————————————————————————————————————————————————————————————
    buffer_atomic_add_f32          vdata,    vaddr,    srsrc,    soffset        idxen offen offset12 slc
    buffer_atomic_pk_add_f16       vdata,    vaddr,    srsrc,    soffset        idxen offen offset12 slc

### VOP2

    INSTRUCTION            DST      SRC0           SRC1           MODIFIERS
    ————————————————————————————————————————————————————————————————————————————————————————————————————
    v_dot2c_f32_f16        vdst,    src0:f16x2,    vsrc1:f16x2
    v_dot2c_f32_f16_dpp    vdst,    vsrc0:m:f16x2, vsrc1:m:f16x2  dpp_ctrl row_mask bank_mask bound_ctrl
    v_dot2c_i32_i16        vdst,    src0:i16x2,    vsrc1:i16x2
    v_dot2c_i32_i16_dpp    vdst,    vsrc0:i16x2,   vsrc1:i16x2    dpp_ctrl row_mask bank_mask bound_ctrl
    v_dot4c_i32_i8         vdst,    src0:i8x4,     vsrc1:i8x4
    v_dot4c_i32_i8_dpp     vdst,    vsrc0:i8x4,    vsrc1:i8x4     dpp_ctrl row_mask bank_mask bound_ctrl
    v_dot8c_i32_i4         vdst,    src0:i4x8,     vsrc1:i4x8
    v_dot8c_i32_i4_dpp     vdst,    vsrc0:i4x8,    vsrc1:i4x8     dpp_ctrl row_mask bank_mask bound_ctrl
    v_fmac_f32             vdst,    src0,          vsrc1
    v_fmac_f32_dpp         vdst,    vsrc0:m,       vsrc1:m        dpp_ctrl row_mask bank_mask bound_ctrl
    v_pk_fmac_f16          vdst,    src0,          vsrc1
    v_xnor_b32             vdst,    src0,          vsrc1
    v_xnor_b32_dpp         vdst,    vsrc0,         vsrc1          dpp_ctrl row_mask bank_mask bound_ctrl
    v_xnor_b32_sdwa        vdst,    src0:m,        src1:m         dst_sel dst_unused src0_sel src1_sel

### VOP3

    INSTRUCTION                    DST       SRC0          SRC1              MODIFIERS
    ———————————————————————————————————————————————————————————————————————————————————
    v_dot2c_f32_f16_e64            vdst,     src0:m:f16x2, src1:m:f16x2      clamp omod
    v_dot2c_i32_i16_e64            vdst,     src0:i16x2,   src1:i16x2        clamp
    v_dot4c_i32_i8_e64             vdst,     src0:i8x4,    src1:i8x4         clamp
    v_dot8c_i32_i4_e64             vdst,     src0:i4x8,    src1:i4x8         clamp
    v_fmac_f32_e64                 vdst,     src0:m,       src1:m            clamp omod
    v_xnor_b32_e64                 vdst,     src0,         src1

### VOP3P

    INSTRUCTION             DST          SRC0          SRC1          SRC2          MODIFIERS
    —————————————————————————————————————————————————————————————————————————————————————————————————————————
    v_accvgpr_read_b32      vdst,        vsrc
    v_accvgpr_write_b32     vdst,        src
    v_dot2_f32_f16          vdst,        src0:f16x2,   src1:f16x2,   src2:f32      neg_lo neg_hi clamp
    v_dot2_i32_i16          vdst,        src0:i16x2,   src1:i16x2,   src2:i32      clamp
    v_dot2_u32_u16          vdst,        src0:u16x2,   src1:u16x2,   src2:u32      clamp
    v_dot4_i32_i8           vdst,        src0:i8x4,    src1:i8x4,    src2:i32      clamp
    v_dot4_u32_u8           vdst,        src0:u8x4,    src1:u8x4,    src2:u32      clamp
    v_dot8_i32_i4           vdst,        src0:i4x8,    src1:i4x8,    src2:i32      clamp
    v_dot8_u32_u4           vdst,        src0:u4x8,    src1:u4x8,    src2:u32      clamp
    v_fma_mix_f32           vdst,        src0:m:fx,    src1:m:fx,    src2:m:fx     m_op_sel m_op_sel_hi clamp
    v_fma_mixhi_f16         vdst,        src0:m:fx,    src1:m:fx,    src2:m:fx     m_op_sel m_op_sel_hi clamp
    v_fma_mixlo_f16         vdst,        src0:m:fx,    src1:m:fx,    src2:m:fx     m_op_sel m_op_sel_hi clamp
    v_mfma_f32_16x16x16f16  vdst:f32x4,  vsrc0:f16x4,  vsrc1:f16x4,  vsrc2:f32x4   cbsz abid blgp
    v_mfma_f32_16x16x1f32   vdst:f32x16, vsrc0:f32,    vsrc1:f32,    vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_16x16x2bf16  vdst:f32x16, vsrc0:bf16x2, vsrc1:bf16x2, vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_16x16x4f16   vdst:f32x16, vsrc0:f16x4,  vsrc1:f16x4,  vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_16x16x4f32   vdst:f32x4,  vsrc0:f32,    vsrc1:f32,    vsrc2:f32x4   cbsz abid blgp
    v_mfma_f32_16x16x8bf16  vdst:f32x4,  vsrc0:bf16x2, vsrc1:bf16x2, vsrc2:f32x4   cbsz abid blgp
    v_mfma_f32_32x32x1f32   vdst:f32x32, vsrc0:f32,    vsrc1:f32,    vsrc2:f32x32  cbsz abid blgp
    v_mfma_f32_32x32x2bf16  vdst:f32x32, vsrc0:bf16x2, vsrc1:bf16x2, vsrc2:f32x32  cbsz abid blgp
    v_mfma_f32_32x32x2f32   vdst:f32x16, vsrc0:f32,    vsrc1:f32,    vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_32x32x4bf16  vdst:f32x16, vsrc0:bf16x2, vsrc1:bf16x2, vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_32x32x4f16   vdst:f32x32, vsrc0:f16x4,  vsrc1:f16x4,  vsrc2:f32x32  cbsz abid blgp
    v_mfma_f32_32x32x8f16   vdst:f32x16, vsrc0:f16x4,  vsrc1:f16x4,  vsrc2:f32x16  cbsz abid blgp
    v_mfma_f32_4x4x1f32     vdst:f32x4,  vsrc0:f32,    vsrc1:f32,    vsrc2:f32x4   cbsz abid blgp
    v_mfma_f32_4x4x2bf16    vdst:f32x4,  vsrc0:bf16x2, vsrc1:bf16x2, vsrc2:f32x4   cbsz abid blgp
    v_mfma_f32_4x4x4f16     vdst:f32x4,  vsrc0:f16x4,  vsrc1:f16x4,  vsrc2:f32x4   cbsz abid blgp
    v_mfma_i32_16x16x16i8   vdst:i32x4,  vsrc0:i8x4,   vsrc1:i8x4,   vsrc2:i32x4   cbsz abid blgp
    v_mfma_i32_16x16x4i8    vdst:i32x16, vsrc0:i8x4,   vsrc1:i8x4,   vsrc2:i32x16  cbsz abid blgp
    v_mfma_i32_32x32x4i8    vdst:i32x32, vsrc0:i8x4,   vsrc1:i8x4,   vsrc2:i32x32  cbsz abid blgp
    v_mfma_i32_32x32x8i8    vdst:i32x16, vsrc0:i8x4,   vsrc1:i8x4,   vsrc2:i32x16  cbsz abid blgp
    v_mfma_i32_4x4x4i8      vdst:i32x4,  vsrc0:i8x4,   vsrc1:i8x4,   vsrc2:i32x4   cbsz abid blgp