On Thu, Feb 11, 2021 at 08:04:55PM +1000, Nicholas Piggin wrote:
Excerpts from Christophe Leroy's message of February 11, 2021 5:41 pm:
quoted
As modern powerpc implement branch folding, that's even more efficient.
Ah, it seems you mean what Arm calls branch folding. Sure, power4
already did that, and this has not changed.
I think POWER will speculate conditional traps as non faulting always
so it should be just as good if not better than the branch.
Right, these are not branch instructions, so are not branch predicted;
all trap instructions are assumed to fall through, like all other
non-branch instructions.
Segher