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Hi Michael, Shuxin, > Shuxin was showing some more complicated patterns that required > re-association to match (fast-math flags permitting). For those, we're > considering if having a re-associate-for-FMA functionality in > codegen-prepare would solve that problem. Thus, we can re-associate in > codegen-prepare and emit FMA in fast-isel. > Yep. I misread the association

On Dec 12, 2012, at 5:20 PM, Eric Christopher <echristo at gmail.com> wrote: > Why not just form them via a fast IR level pass and just have patterns match in fast isel instead of trying to form code? Or are we saying the same thing? (Your words of "fast isel spot"ting and "form better code" caused me to think you mean to do optimizations within the fast isel pass).