[PATCH] D142084: [RFC][X86][MemFold] Upgrade the mechanism of auto-generated Memory Folding Table

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: llvm/utils/TableGen/X86FoldTablesEmitter.cpp:386
+    Result.IsAligned = (S & TB_ALIGN_MASK) != 0;
+    Result.Alignment = 1 << (((S & TB_ALIGN_MASK) >> TB_ALIGN_SHIFT) - 1);
+    Table[RegInstr] = Result;
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Is it possible for S & TB_ALIGN_MASK to be 0? That would cause 1<< -1 which would match the ubsan error


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142084/new/

https://reviews.llvm.org/D142084