SIMD-0321: VM Register 2 Instruction Data Pointer

SIMD-0321 (VM Register 2 Instruction Data Pointer) is a Core Standard Solana Improvement Document by Joe Caulfield (Anza), Dean Little (Blueshift); proposal status Activated.

Active on mainnet-beta since epoch 950; active on testnet since epoch 911; active on devnet since epoch 1034.

Feature gates

• Feature gate: SIMD-0321: Provide instruction data offset in VM r2

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