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Michael Liao
5571fe4bfc
Summary: - Don't treat the use of a scalar register as `vreg_1` an VGPR usage. Otherwise, that promotes that scalar register into vector one, which breaks the assumption that scalar register holds the lane mask. - The issue is triggered in a complicated case, where if the uses of that (lane mask) scalar register is legalized firstly before its definition, e.g., due to the mismatch block placement and its topological order or loop. In that cases, the legalization of PHI introduces the use of that scalar register as `vreg_1`. Reviewers: rampitec, nhaehnle, arsenm, alex-t Subscribers: kzhuravl, jvesely, wdng, dstuttard, tpr, t-tye, hiraditya, llvm-commits, yaxunl Tags: #llvm Differential Revision: https://reviews.llvm.org/D62492 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@361847 91177308-0d34-0410-b5e6-96231b3b80d8
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