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268577
2020 Apr 01
2
canonical form loops
Interesting, thanks for digging this up!
> As a consequence, any loop structure that is recognized
> by SCEV will (/should) not profit from rewriting.
As discussed in https://reviews.llvm.org/D68577#1742745 and PR40816 showed, there is still merit and profit in further simplifying loop induction variables, or at-least the primary one; somewhat independent of continuing to rely on SCEV for analyzing loops.
> enable-iv-rewrite=false was made the default in r139579 after finding that it
>...
2020 Mar 26
5
canonical form loops
Hello,
Quick question to see if I haven't missed anything: I would like convert counting down loops, i.e. loops with a constant -1 step value, to counting up loops, because the vectoriser is able to better deal with these loops (see e.g. D76838 that I was discussing today with Ayal). It looks like LoopSimplifyCFG and IndVarSimplify don't do this. So was just curious if I haven't