[all-commits] [llvm/llvm-project] f3b184: [RISCV] Consolidate some DecoderNamespaces for sta...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f3b18491e840c23dfe25e399ddf6475425481835
      https://github.com/llvm/llvm-project/commit/f3b18491e840c23dfe25e399ddf6475425481835
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2025-02-27 (Thu, 27 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
    M llvm/lib/Target/RISCV/RISCVInstrInfoD.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoF.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoZa.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoZc.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoZfh.td

  Log Message:
  -----------
  [RISCV] Consolidate some DecoderNamespaces for standard extensions. (#128954)

First thing to know is that the subtarget feature checks used to block
accessing a decoder table are only a performance optimization and not
required for functionality. The tables have their own predicate checks.
I've removed them from all the standard extension tables.

-RV32 Zacas decoder namespace has been renamed to RV32GPRPair, I think
Zilsd(rv32 load/store pair) can go in here too.
-The RV32 Zdinx table has been renamed to also use RV32GPRPair.
-The Zfinx table has been renamed to remove superflous "RV" prefix.
-Zcmp and Zcmt tables have been combined into a ZcOverlap table. I think
 Zclsd(rv32 compressed load/store pair) can go in here too.
-All the extra standard extension tables are checked after the main
 standard extension table. This makes the common case of the main table
 matching occur earlier.
-Zicfiss is the exception to this as it needs to be checked before
 the main table since it overrides some encodings from Zcmop. This
can't be handled by a predicate based priority as Zicfiss only overrides
 a subset of Zcmop encodings.



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