intrinsics[intrinsicKey{a, pkg, fn}] = b
			}
		}
	}
	// alias defines pkg.fn = pkg2.fn2 for all architectures in archs for which pkg2.fn2 exists.
	alias := func(pkg, fn, pkg2, fn2 string, archs ...*sys.Arch) {
		aliased := false
		for _, a := range archs {
			if b, ok := intrinsics[intrinsicKey{a, pkg2, fn2}]; ok {
				intrinsics[intrinsicKey{a, pkg, fn}] = b
				aliased = true
			}
		}