[PATCH] D76464: [ValueTracking][SVE] Fix getOffsetFromIndex for scalable vector.

[Huihui Zhang via Phabricator via llvm-commits]

huihuiz created this revision.
huihuiz added reviewers: sdesmalen, efriedma, apazos, reames.
huihuiz added a project: LLVM.
Herald added subscribers: psnobl, arphaman, rkruppe, hiraditya, tschuett.

Return None if GEP index type is scalable vector. Size of scalable vectors
are multiplied by a runtime constant.

Avoid transforming:

  %a = bitcast i8* %p to <vscale x 16 x i8>*
  %tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 0
  store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp0
  %tmp1 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 1
  store <vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8>* %tmp1

into:

  %a = bitcast i8* %p to <vscale x 16 x i8>*
  %tmp0 = getelementptr <vscale x 16 x i8>, <vscale x 16 x i8>* %a, i64 0
  %1 = bitcast <vscale x 16 x i8>* %tmp0 to i8*
  call void @llvm.memset.p0i8.i64(i8* align 16 %1, i8 0, i64 32, i1 false)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76464

Files:
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/test/Transforms/MemCpyOpt/vscale-memset.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D76464.251504.patch
Type: text/x-patch
Size: 7141 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20200320/8e250f32/attachment.bin>