memory

memory.copy

Copy bytes within or between memories.

bulk-memory0xFC 0x0A

Syntax

memory.copy

Stack Effect

[dst i32, src i32, len i32] -> []

Opcode

Hex

0xFC 0x0A

Decimal

252 10

Bytes

[0xfc, 0x0a]

Prefix

0xFC bulk-memory / saturating conversions / table extension space

Encoding

0xFC 0x0A <memidx:u32-leb128> <memidx:u32-leb128>

Immediates

memidx: u32-leb128 — memory index (0 unless multi-memory)
memidx: u32-leb128 — memory index (0 unless multi-memory)

Category

memory

Proposal

bulk-memory

Browser Support

Feature-detect runtime support before executing examples.

Validation Rules

Operands and result types must match the instruction signature.
The instruction must appear in a valid structured control context.

Common Mistakes

Using the instruction with the wrong operand type.
Forgetting that WAT validation is stack-typed.

Example

(func $example
  ;; memory.copy example
)

memory

memory.copy

Copy bytes within or between memories.

bulk-memory0xFC 0x0A

Syntax

memory.copy

Stack Effect

[dst i32, src i32, len i32] -> []

Opcode

Hex

0xFC 0x0A

Decimal

252 10

Bytes

[0xfc, 0x0a]

Prefix

0xFC bulk-memory / saturating conversions / table extension space

Encoding

0xFC 0x0A <memidx:u32-leb128> <memidx:u32-leb128>

Immediates

memidx: u32-leb128 — memory index (0 unless multi-memory)
memidx: u32-leb128 — memory index (0 unless multi-memory)

Category

memory

Proposal

bulk-memory

Browser Support

Feature-detect runtime support before executing examples.

Validation Rules

Operands and result types must match the instruction signature.
The instruction must appear in a valid structured control context.

Common Mistakes

Using the instruction with the wrong operand type.
Forgetting that WAT validation is stack-typed.

Example

(func $example
  ;; memory.copy example
)