[PATCH] D133799: [SDAG] try multi-use demanded bits folds for 'add'

[Sanjay Patel via Phabricator via llvm-commits]

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This is the codegen equivalent of D133788 <https://reviews.llvm.org/D133788>. Test diffs are all over the place, so we'd need to do some digging on the regressions before proceeding.


https://reviews.llvm.org/D133799

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/AArch64/srem-seteq.ll
  llvm/test/CodeGen/AMDGPU/udiv64.ll
  llvm/test/CodeGen/Mips/urem-seteq-illegal-types.ll
  llvm/test/CodeGen/PowerPC/ppc-32bit-build-vector.ll
  llvm/test/CodeGen/RISCV/div-by-constant.ll
  llvm/test/CodeGen/RISCV/div.ll
  llvm/test/CodeGen/RISCV/srem-lkk.ll
  llvm/test/CodeGen/RISCV/srem-seteq-illegal-types.ll
  llvm/test/CodeGen/SystemZ/shift-08.ll
  llvm/test/CodeGen/X86/avx512-intrinsics-fast-isel.ll
  llvm/test/CodeGen/X86/combine-pmuldq.ll
  llvm/test/CodeGen/X86/combine-sdiv.ll
  llvm/test/CodeGen/X86/combine-udiv.ll
  llvm/test/CodeGen/X86/dpbusd_const.ll
  llvm/test/CodeGen/X86/sad.ll
  llvm/test/CodeGen/X86/srem-seteq-vec-nonsplat.ll
  llvm/test/CodeGen/X86/vector-reduce-mul.ll

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