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WebAssembly SIMD-specific instructions - WebAssembly | MDN
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WebAssembly SIMD-specific instructions

WebAssembly SIMD (single instruction, multiple data) instructions.

Note: The instructions in this section are SIMD-specific. Many of the general (non-SIMD-specific) reference pages include information on using those instructions with SIMD as well as non-SIMD types.

Arithmetic instructions

SIMD-specific arithmetic instructions.

Bitwise instructions

SIMD-specific bitwise instructions.

Conversion instructions

SIMD conversion instructions.

Extract instructions

SIMD extract instructions.

Load and store instructions

SIMD load and store instructions.

In this article

See also

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This page was last modified on May 21, 2026 by MDN contributors.

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  1. WebAssembly
  2. Guides
  3. WebAssembly concepts
  4. Compiling WebAssembly
    1. Compiling a new C/C++ module to WebAssembly
    2. Compiling an existing C module to WebAssembly
    3. Compiling from Rust to WebAssembly
  5. WebAssembly language
    1. Understanding WebAssembly text format
    2. Converting WebAssembly text format to binary
    3. Exported WebAssembly functions
    4. JavaScript builtins
    5. Imported global string constants
  6. JavaScript API guide
    1. Using the WebAssembly JavaScript API
    2. Loading and running WebAssembly code
  7. Reference
  8. JavaScript interface
    1. WebAssembly
      1. WebAssembly.compile()
      2. WebAssembly.compileStreaming()
      3. WebAssembly.instantiate()
      4. WebAssembly.instantiateStreaming()
      5. WebAssembly.promising()
      6. WebAssembly.validate()
    2. WebAssembly.Global
      1. Global()
      2. value
      3. valueOf()
    3. WebAssembly.Instance
      1. WebAssembly.Instance.prototype.exports
      2. WebAssembly.Instance() constructor
    4. WebAssembly.Memory
      1. WebAssembly.Memory.prototype.buffer
      2. WebAssembly.Memory.prototype.grow()
      3. WebAssembly.Memory() constructor
    5. WebAssembly.Module
      1. WebAssembly.Module.customSections()
      2. WebAssembly.Module.exports()
      3. WebAssembly.Module.imports()
      4. WebAssembly.Module() constructor
    6. WebAssembly.Suspending
      1. WebAssembly.Suspending()
    7. WebAssembly.Table
      1. WebAssembly.Table.prototype.get()
      2. WebAssembly.Table.prototype.grow()
      3. WebAssembly.Table.prototype.length
      4. WebAssembly.Table.prototype.set()
      5. WebAssembly.Table() constructor
    8. WebAssembly.Tag
      1. WebAssembly.Tag.prototype.type()
      2. WebAssembly.Tag() constructor
    9. WebAssembly.Exception
      1. WebAssembly.Exception constructor
      2. WebAssembly.Exception.prototype.getArg()
      3. WebAssembly.Exception.prototype.is()
      4. WebAssembly.Exception.prototype.stack
    10. WebAssembly.CompileError
      1. WebAssembly.CompileError() constructor
    11. WebAssembly.LinkError
      1. WebAssembly.LinkError() constructor
    12. WebAssembly.RuntimeError
      1. WebAssembly.RuntimeError() constructor
    13. WebAssembly.SuspendError
      1. WebAssembly.SuspendError() constructor
  9. Value types
    1. i32
    2. i64
    3. f32
    4. f64
    5. v128
    6. funcref
    7. exnref
    8. externref
  10. Definitions
    1. Types
      1. func
    2. data
    3. elem
    4. global
    5. memory
    6. table
    7. tag
  11. Instructions
    1. Control flow
      1. block
      2. br
      3. br_if
      4. br_table
      5. call
      6. drop
      7. end
      8. if...else
      9. loop
      10. nop
      11. return
      12. select
      13. unreachable
    2. Data
      1. drop
    3. Elem
      1. drop
    4. Exception handling
      1. throw
      2. throw_ref
      3. try_table
        1. catch
        2. catch_all
        3. catch_all_ref
        4. catch_ref
    5. Memory
      1. copy
      2. fill
      3. grow
      4. init
      5. load
      6. size
      7. store
    6. Numeric
      1. abs
      2. add
      3. and
      4. ceil
      5. clz
      6. const
      7. convert
      8. copysign
      9. ctz
      10. demote
      11. div
      12. eq
      13. eqz
      14. extend
      15. extend8_s
      16. extend16_s
      17. extend32_s
      18. floor
      19. ge
      20. ge_s
      21. ge_u
      22. gt
      23. gt_s
      24. gt_u
      25. le
      26. le_s
      27. le_u
      28. lt
      29. lt_s
      30. lt_u
      31. max
      32. min
      33. mul
      34. ne
      35. nearest
      36. neg
      37. or
      38. popcnt
      39. promote_32
      40. reinterpret
      41. rem
      42. rotl
      43. rotr
      44. shl
      45. shr_s
      46. shr_u
      47. sqrt
      48. sub
      49. trunc
      50. trunc_f32_s
      51. trunc_f32_u
      52. trunc_f64_s
      53. trunc_f64_u
      54. wrap_i64
      55. xor
    7. SIMD
      1. Arithmetic
        1. add_sat_s
        2. add_sat_u
        3. avgr_u
        4. dot_i16x8_s
        5. extadd_pairwise_i8x16_s
        6. extadd_pairwise_i8x16_u
        7. extadd_pairwise_i16x8_s
        8. extadd_pairwise_i16x8_u
        9. extmul_high_i8x16_s
        10. extmul_high_i8x16_u
        11. extmul_high_i16x8_s
        12. extmul_high_i16x8_u
        13. extmul_high_i32x4_s
        14. extmul_high_i32x4_u
        15. extmul_low_i8x16_s
        16. extmul_low_i8x16_u
        17. extmul_low_i16x8_s
        18. extmul_low_i16x8_u
        19. extmul_low_i32x4_s
        20. extmul_low_i32x4_u
        21. max_s
        22. max_u
        23. min_s
        24. min_u
        25. pmax
        26. pmin
        27. q15mulr_sat_s
        28. sub_sat_s
        29. sub_sat_u
      2. Bitwise
        1. all_true
        2. andnot
        3. any_true
        4. bitmask
        5. bitselect
        6. not
      3. Conversion
        1. convert_i32x4_s
        2. convert_i32x4_u
        3. convert_low_i32x4_s
        4. convert_low_i32x4_u
        5. demote_f64x2_zero
        6. extend_high_i8x16_s
        7. extend_high_i8x16_u
        8. extend_high_i16x8_s
        9. extend_high_i16x8_u
        10. extend_high_i32x4_s
        11. extend_high_i32x4_u
        12. extend_low_i8x16_s
        13. extend_low_i8x16_u
        14. extend_low_i16x8_s
        15. extend_low_i16x8_u
        16. extend_low_i32x4_s
        17. extend_low_i32x4_u
        18. narrow_i16x8_s
        19. narrow_i16x8_u
        20. narrow_i32x4_s
        21. narrow_i32x4_u
        22. promote_low_f32x4
        23. replace_lane
        24. shuffle
        25. splat
        26. swizzle
        27. trunc_sat_f32x4_s
        28. trunc_sat_f32x4_u
        29. trunc_sat_f64x2_s_zero
        30. trunc_sat_f64x2_u_zero
      4. Extract
        1. extract_lane
        2. extract_lane_s
        3. extract_lane_u
      5. Load and store
        1. load
        2. load8_lane
        3. load8_splat
        4. load8x8_s
        5. load8x8_u
        6. load16_lane
        7. load16_splat
        8. load16x4_s
        9. load16x4_u
        10. load32_lane
        11. load32_splat
        12. load32_zero
        13. load32x2_s
        14. load32x2_u
        15. load64_lane
        16. load64_splat
        17. load64_zero
        18. store
        19. store8_lane
        20. store16_lane
        21. store32_lane
        22. store64_lane
    8. Table
      1. copy
      2. fill
      3. get
      4. grow
      5. init
      6. set
      7. size
    9. Variables
      1. global.get
      2. global.set
      3. local
      4. local.get
      5. local.set
      6. local.tee
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