c := &Config{arch: arch, Types: types}
	c.useAvg = true
	c.useHmul = true
	switch arch {
	case "amd64":
		c.PtrSize = 8
		c.RegSize = 8
		c.lowerBlock = rewriteBlockAMD64
		c.lowerValue = rewriteValueAMD64
		c.lateLowerBlock = rewriteBlockAMD64latelower
		c.lateLowerValue = rewriteValueAMD64latelower
		c.splitLoad = rewriteValueAMD64splitload
		c.registers = registersAMD64[:]
		c.gpRegMask = gpRegMaskAMD64