On 10/09/2015 11:36 PM, Mike Stump wrote:
So, I keep on seeing inaccurate schedule time on the conditional branches after a store, and tracked it down to this type of solution. On my machine, I can run these two in the same cycle, but with a REG_DEP_OUTPUT dependency it was moving the branch to the next cycle.
I kinda wanted a control dependency of some sort, but those seem only to be used for predicated instructions, which doesn’t apply to the case at hand. For the instructions, from my view, there are no data dependencies at all. What dependencies exists is the dependency that one cannot interchange:
mem[$r1] = 1 if ($r2) jump L5
This last case being the one that I’m interested in. So, the question is, is the below patch the right way to fix this?
I'd recommend trying to fix this with the adjust_cost hook instead. Bernd
