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...ry sensitive to the ability of the codegen to lower them. If a vectorizer generates shuffle instructions which are not handled properly by the manual lowering code, then the instruction is scalarized. 2. Instructions with mixed types -Instructions which operate on mixed types, such as 2xfloat->2xdouble, are usually scalarized by the type legalizer. Nadav -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Duncan Sands Sent: Friday, February 03, 2012 10:50 To: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] Vectorization: Next Steps...

Hi Hal, > As some of you may know, I committed my basic-block autovectorization > pass a few days ago. I encourage anyone interested to try it out (pass > -vectorize to opt or -mllvm -vectorize to clang) and provide feedback. > Especially in combination with -unroll-allow-partial, I have observed > some significant benchmark speedups, but, I have also observed some > significant

As some of you may know, I committed my basic-block autovectorization pass a few days ago. I encourage anyone interested to try it out (pass -vectorize to opt or -mllvm -vectorize to clang) and provide feedback. Especially in combination with -unroll-allow-partial, I have observed some significant benchmark speedups, but, I have also observed some significant slowdowns. I would like to share my