(NilCheck ...) => (LoweredNilCheck ...)
(IsNonNil ptr) => (NotEqual (CMPconst [0] ptr))
(IsInBounds      idx len) => (LessThanU  (CMP idx len))
(IsSliceInBounds idx len) => (LessEqualU (CMP idx len))

// pseudo-ops
(GetClosurePtr ...) => (LoweredGetClosurePtr ...)
(GetCallerSP   ...) => (LoweredGetCallerSP   ...)
(GetCallerPC   ...) => (LoweredGetCallerPC   ...)

// Absorb pseudo-ops into blocks.

	case OpFloor:
		v.Op = OpWasmF64Floor
		return true
	case OpGetCallerPC:
		v.Op = OpWasmLoweredGetCallerPC
		return true
	case OpGetCallerSP:
		v.Op = OpWasmLoweredGetCallerSP
		return true
	case OpGetClosurePtr:
		v.Op = OpWasmLoweredGetClosurePtr
		return true
	case OpInterCall:
		v.Op = OpWasmLoweredInterCall
		return true
	case OpIsInBounds:
		v.Op = OpWasmI64LtU
		return true
	case OpIsNonNil:

	case OpEqPtr:
		return rewriteValueMIPS_OpEqPtr(v)
	case OpGetCallerPC:
		v.Op = OpMIPSLoweredGetCallerPC
		return true
	case OpGetCallerSP:
		v.Op = OpMIPSLoweredGetCallerSP
		return true
	case OpGetClosurePtr:
		v.Op = OpMIPSLoweredGetClosurePtr
		return true
	case OpHmul32:
		return rewriteValueMIPS_OpHmul32(v)
	case OpHmul32u:
		return rewriteValueMIPS_OpHmul32u(v)
	case OpInterCall:

		return rewriteValueLOONG64_OpEqPtr(v)
	case OpGetCallerPC:
		v.Op = OpLOONG64LoweredGetCallerPC
		return true
	case OpGetCallerSP:
		v.Op = OpLOONG64LoweredGetCallerSP
		return true
	case OpGetClosurePtr:
		v.Op = OpLOONG64LoweredGetClosurePtr
		return true
	case OpHmul32:
		return rewriteValueLOONG64_OpHmul32(v)
	case OpHmul32u:
		return rewriteValueLOONG64_OpHmul32u(v)
	case OpHmul64:

	case OpEqPtr:
		return rewriteValueMIPS64_OpEqPtr(v)
	case OpGetCallerPC:
		v.Op = OpMIPS64LoweredGetCallerPC
		return true
	case OpGetCallerSP:
		v.Op = OpMIPS64LoweredGetCallerSP
		return true
	case OpGetClosurePtr:
		v.Op = OpMIPS64LoweredGetClosurePtr
		return true
	case OpHmul32:
		return rewriteValueMIPS64_OpHmul32(v)
	case OpHmul32u:
		return rewriteValueMIPS64_OpHmul32u(v)
	case OpHmul64:

		v.Op = OpRISCV64FMADDD
		return true
	case OpGetCallerPC:
		v.Op = OpRISCV64LoweredGetCallerPC
		return true
	case OpGetCallerSP:
		v.Op = OpRISCV64LoweredGetCallerSP
		return true
	case OpGetClosurePtr:
		v.Op = OpRISCV64LoweredGetClosurePtr
		return true
	case OpHmul32:
		return rewriteValueRISCV64_OpHmul32(v)
	case OpHmul32u:
		return rewriteValueRISCV64_OpHmul32u(v)
	case OpHmul64: