[PATCH] D24822: [SelectionDAG] Enable division-by-constant optimization for wide types

[Nicolai Hähnle via llvm-commits]

nhaehnle updated this revision to Diff 72774.
nhaehnle marked an inline comment as done.
nhaehnle added a comment.
Herald added subscribers: dschuff, jfb.

I still think it's pretty misguided to rely on errors from the backend,
given that this would be trivial to catch in the frontend where you have
more context for useful error messages anyway, but whatever.

I'm going to take the isIntDivCheap route because yes, it does have to do
with optimizations: you're relying on no optimizations being applied to
sdiv.


https://reviews.llvm.org/D24822

Files:
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/AMDGPU/SOPInstructions.td
  lib/Target/BPF/BPFISelLowering.cpp
  lib/Target/BPF/BPFISelLowering.h
  lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
  lib/Target/WebAssembly/WebAssemblyISelLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/AMDGPU/sdiv.ll
  test/CodeGen/AMDGPU/udiv.ll
  test/CodeGen/SPARC/rem.ll

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