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...lizeVectorShuffle' to handle shuffles that perform a splat > operation. > On AVX, function 'NormalizeVectorShuffle' tries to lower a splat where > the splat value comes from a load into a X86ISD::VBROADCAST dag node. > Later on, during instruction selection, we emit a single avx_broadcast > for the load+splat sequence (basically, we end up folding the load in > the operand of the vbroadcastss). > > What happens is that the new shuffle lowering doesn't emit a > vbroadcast node in this case and eventually we end up selecting the > sequence of vmovss+vpermilps. &g...

On Tue, Sep 23, 2014 at 2:35 PM, Simon Pilgrim <llvm-dev at redking.me.uk> wrote: > If you don’t want to spend time on this, I’d be happy to create a > candidate patch for review? I’ve been unclear if you were taking patches > for your shuffle work prior to it becoming the default. While I'm happy to work on it, I'm even more happy to have patches. =D -------------- next

On Tue, Sep 9, 2014 at 11:39 PM, Chandler Carruth <chandlerc at google.com> wrote: > Awesome, thanks for all the information! > > See below: > > On Tue, Sep 9, 2014 at 6:13 AM, Andrea Di Biagio <andrea.dibiagio at gmail.com> > wrote: >> >> You have already mentioned how the new shuffle lowering is missing >> some features; for example, you explicitly