[PATCH] D114964: [DAG] Create fptoui.sat from clamped fptoui

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
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This is the unsigned variant of D111976 <https://reviews.llvm.org/D111976>, where we convert a clamped fptoui to a fptoui.sat. Because we are unsigned, the condition this time is only UMIN of UINT_MAX. Similarly to D111976 <https://reviews.llvm.org/D111976> it handles ISD::UMIN, ISD::SETCC/ISD::SELECT, ISD::VSELECT or ISD::SELECT_CC nodes.

This especially helps on ARM/AArch64 where the vcvt instructions naturally saturate the result.


https://reviews.llvm.org/D114964

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AArch64/fpclamptosat.ll
  llvm/test/CodeGen/AArch64/fpclamptosat_vec.ll
  llvm/test/CodeGen/ARM/fpclamptosat.ll
  llvm/test/CodeGen/RISCV/fpclamptosat.ll
  llvm/test/CodeGen/Thumb2/mve-fpclamptosat_vec.ll
  llvm/test/CodeGen/WebAssembly/fpclamptosat.ll
  llvm/test/CodeGen/WebAssembly/fpclamptosat_vec.ll

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