search for: gaterallaliases

...ion to scalars? I wanted the same thing for SystemZ, which doesn't have vectors, in order to improve the llvmpipe code. FWIW, here's what I have locally. It is able to decompose loads and stores, but I found in the llvmpipe case that this made things worse with TBAA, because DAGCombiner::GaterAllAliases has some fairly strict limits. So I disabled that by default; use -decompose-vector-load-store to reenable. The main motivation for z was instead to get InstCombine to rewrite things like scalarised selects. I haven't submitted it yet because it's less of a win than the TBAA DAGCombiner...

Hi, LLVM community, I write some code in hand using LLVM IR. for simplicity, I write them in <4 x float>. now I found some stores for elements are useless. for example, If I store {0.0, 1.0, 2.0, 3.0} to a <4 x float> %a. maybe only %a.xy is alive in my program. our target doesn't feature SIMD instruction, which means we have to lower vector to many scalar instructions. I found

...wanted the same thing for SystemZ, which doesn't have vectors, > in order to improve the llvmpipe code. FWIW, here's what I have locally. > > It is able to decompose loads and stores, but I found in the llvmpipe case > that this made things worse with TBAA, because DAGCombiner::GaterAllAliases > has some fairly strict limits. So I disabled that by default; use > -decompose-vector-load-store to reenable. > > The main motivation for z was instead to get InstCombine to rewrite > things like scalarised selects. > > I haven't submitted it yet because it's less of...