Hi, Thanks for looking at this!
On 2018-07-13 10:20:42 +0200, Pierre Ducroquet wrote: > 2) improve the LLVM IR code > > The code generator in llvmjit-deform.c currently rely on the LLVM optimizer > to > do the right thing. For instance, it can generate a lot of empty blocks with > only a jump. If we don't want to enable the LLVM optimizer for every code, we > have to get rid of this kind of pattern. The attached patch does that. When > the optimizer is not used, this gets a few cycles boost, nothing impressive. > I have tried to go closer to the optimized bitcode, but it requires building > phi nodes manually instead of using alloca, and this isn't enough to bring us > to the performance level of -O1. Building phi blocks manually is too painful imo. But there's plenty blocks we could easily skip entirely, even without creating phi nodes. > From 4da278ee49b91d34120747c6763c248ad52da7b7 Mon Sep 17 00:00:00 2001 > From: Pierre Ducroquet <p.p...@pinaraf.info> > Date: Mon, 2 Jul 2018 13:44:10 +0200 > Subject: [PATCH] Introduce opt1 in LLVM/JIT, and force it with deforming I think I'd rather go for more explicit pipelines than defaulting to OX pipelines. This is too late for v11, and I suspect quite strongly that we'll end up not relying on any of the default pipelines going forward - they're just not targeted at our usecase. I just didn't go there for v11, because I was running out of steam / time. Greetings, Andres Freund
