Bulk Memory Operations

Bulk memory adds fast, in-engine operations for copying and filling regions of memory and tables.

memory.copy and memory.fill

(module
  (memory (export "memory") 1)
  (func (export "copy") (param $dst i32) (param $src i32) (param $len i32)
    (memory.copy (local.get $dst) (local.get $src) (local.get $len)))
  (func (export "fill") (param $dst i32) (param $value i32) (param $len i32)
    (memory.fill (local.get $dst) (local.get $value) (local.get $len)))
)

table.copy, table.fill

(module
  (table (export "table") 10 funcref)
  (func (export "tfill") (param $idx i32) (param $len i32)
    (table.fill 0 (local.get $idx) (ref.null func) (local.get $len)))
)

Instruction Reference

• Memory Instructions — memory.copy, memory.fill, memory.init, data.drop
• Table Instructions — table.copy, table.fill, table.init, elem.drop