[all-commits] [llvm/llvm-project] e2c74a: [TableGen][MVT] Lower the maximum 16-bit MVT from ...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e2c74aa535752cd6cf098731608d26275d1e40ac
      https://github.com/llvm/llvm-project/commit/e2c74aa535752cd6cf098731608d26275d1e40ac
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2024-07-31 (Wed, 31 Jul 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/ValueTypes.td
    M llvm/utils/TableGen/Common/CodeGenDAGPatterns.h
    M llvm/utils/TableGen/VTEmitter.cpp

  Log Message:
  -----------
  [TableGen][MVT] Lower the maximum 16-bit MVT from 16384 to 511. (#101401)

MachineValueTypeSet in tablegen allocates an array with a bit per MVT.
This used to be 256 bits, with the introduction of 16-bit MVT it
ballooned to 65536 bits. I suspect this is increasing the memory usage
of many of the data structures used by CodeGenDAGPatterns.

Since we don't need the full 16-bit range yet, this patch proposes
lowering the maximum MVT to 511 and using only 512 bits for
MachineValueTypeSet's storage.



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