On 05/03/2012 08:23 AM, Paolo Bonzini wrote:
Yeah, not as I posted... of course config/mips/mips.h needs change, but do you disagree that all targets_do_ have the same value at zero for the optab as they have for RTL?
I don't agree without a port-by-port review, no. If, as you suggest, we get proper agreement between the gimple-level (aka optab level) definedness and the rtl-level definedness, then we should drop the tri-state and go back to simple boolean. I'm uncertain if there's any point in settings such as for rs6000, where we do know that ctz(0) = -1. Should we only define the value for clz(0) = wordsize and let the rtl optimizers fold ctz(0) away? r~
