def4e491be
Add post-lowering identity and absorption rules for I64And, I64Or, I64Xor, and I64Mul with constant operands: (I64And x (I64Const [-1])) => x (I64And x (I64Const [0])) => (I64Const [0]) (I64Or x (I64Const [0])) => x (I64Or x (I64Const [-1])) => (I64Const [-1]) (I64Xor x (I64Const [0])) => x (I64Mul x (I64Const [0])) => (I64Const [0]) (I64Mul x (I64Const [1])) => x The generic SSA rules handle these patterns before lowering, but these rules catch cases where wasm-specific lowering or other post-lowering optimization passes produce new nodes with identity or absorbing constant operands. For example, the complement rule lowers Com64(x) to (I64Xor x (I64Const [-1])), and if x is later determined to be all-ones, the I64And absorption rule can fold the result to zero. Cq-Include-Trybots: luci.golang.try:gotip-wasip1-wasm_wasmtime,gotip-wasip1-wasm_wazero Change-Id: Ie9a40e075662d4828a70e30b258d92ee171d0bc2 Reviewed-on: https://go-review.googlesource.com/c/go/+/752861 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: David Chase <drchase@google.com>
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