[PATCH] D69116: [TargetLowering][DAGCombine][MSP430] Shift Amount Threshold in DAGCombine (1/2)

[Joan LLuch via Phabricator via llvm-commits]

joanlluch created this revision.
joanlluch added reviewers: spatel, lebedev.ri.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

This is a continuation of D68982 <https://reviews.llvm.org/D68982>, following community recommendations

Provides a TLI hook to allow targets to relax the emission of shifts, thus enabling codegen improvements on targets with no multiple shift instructions and cheap selects or branches.

Contributes to a Fix for https://bugs.llvm.org/show_bug.cgi?id=43559

Should be commited after D69099 <https://reviews.llvm.org/D69099>

This is part 1, defining the TLI hook, incorporating it in the MSP430 target, and using it in TagetLogwering.cpp.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D69116

Files:
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
  llvm/lib/Target/MSP430/MSP430ISelLowering.h
  llvm/test/CodeGen/MSP430/shift-amount-threshold.ll

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