// func nanotime1() int64
					"runtime.nanotime1": (sp) => {
						sp >>>= 0;
						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
					},

					// func walltime() (sec int64, nsec int32)
					"runtime.walltime": (sp) => {
						sp >>>= 0;
						const msec = (new Date).getTime();
						setInt64(sp + 8, msec / 1000);
						this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true);
					},