The ugly hack below shaves 20% from the switch-case
type iface struct {
tab *unsafe.Pointer
data *unsafe.Pointer
}
func getInterfaceData(arg interface{}) unsafe.Pointer {
return unsafe.Pointer((((*iface)(unsafe.Pointer(&arg))).data))
}
// Cast the integer argument to uint64 and call a "writer"
// The "writer" knows how many bytes to add to the binary stream
//
// Type casts from interface{} to integer consume 40% of the overall
// time. Can I do better? What is interface{} in Golang?
// Switching to args *[]interface makes the performance 2x worse
// Before you jump to conlusions see
// https://groups.google.com/forum/#!topic/golang-nuts/Og8s9Y-Kif4
func (b *Binlog) writeArgumentToOutput(writer writer, arg interface{})
error {
// unsafe pointer to the data depends on the data type
var err error
err = writer.write(b.ioWriter, getInterfaceData(arg))
return err
}
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