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----- Original Message ----- > From: "Mehdi Amini via llvm-dev" <llvm-dev at lists.llvm.org> > To: "Shixiong Xu" <shixiong at cadence.com> > Cc: llvm-dev at lists.llvm.org > Sent: Thursday, August 18, 2016 11:05:35 AM > Subject: Re: [llvm-dev] Cost model is missing in InstCombiner > +David M. > > On Aug 17, 2016, at 3:48 AM, Shixiong Xu via llvm-dev < > > llvm-dev a...

...ced that the dead instructions collected when build vplan are invariant to different ranges of VFs since the original loop is not changed. Maybe DeadInstructions should be treated as a data member of LoopVectorizationPlanner and initialized by collectTriviallyDeadInstructions() in plan()? Cheers, Shixiong (Jason) Xu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180601/69f28841/attachment.html>

...mul <32 x i8> %wide.load25, %wide.load IC: Replacing %10 = trunc <32 x i16> %7 to <32 x i8> with %6 = mul <32 x i8> %wide.load25, %wide.load If the target doesn't have support for mul <32 x i8>, the inst combiner will yield less profitable code. Cheers, Shixiong (Jason) Xu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160817/961996b5/attachment.html>

...i = 2; i <= MaxVF; i *= 2) { // Notice that the vector loop needs to be executed less times, so // we need to divide the cost of the vector loops by the width of // the vector elements. VectorizationCostTy C = expectedCost(i); float VectorCost = C.first / (float)i; Cheers, Shixiong (Jason) Xu -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180601/ec49697c/attachment.html>