[all-commits] [llvm/llvm-project] 6c32a1: [SystemZ] Enable MachineCombiner for FP reassociat...

[Jonas Paulsson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c32a1fdf712e58a324fc0f6e3dfc83ed7d56b1e
      https://github.com/llvm/llvm-project/commit/6c32a1fdf712e58a324fc0f6e3dfc83ed7d56b1e
  Author: Jonas Paulsson <paulson1 at linux.ibm.com>
  Date:   2024-04-30 (Tue, 30 Apr 2024)

  Changed paths:
    M llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
    M llvm/lib/Target/SystemZ/SystemZInstrFP.td
    M llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
    M llvm/lib/Target/SystemZ/SystemZInstrInfo.h
    M llvm/lib/Target/SystemZ/SystemZInstrVector.td
    M llvm/lib/Target/SystemZ/SystemZOperators.td
    M llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
    M llvm/test/CodeGen/SystemZ/anyregcc.ll
    A llvm/test/CodeGen/SystemZ/foldmem-peep.mir
    M llvm/test/CodeGen/SystemZ/fp-add-01.ll
    M llvm/test/CodeGen/SystemZ/fp-add-02.ll
    M llvm/test/CodeGen/SystemZ/fp-mul-01.ll
    M llvm/test/CodeGen/SystemZ/fp-mul-03.ll
    M llvm/test/CodeGen/SystemZ/fp-sub-01.ll
    M llvm/test/CodeGen/SystemZ/fp-sub-02.ll
    A llvm/test/CodeGen/SystemZ/machine-combiner-reassoc-fp.ll
    M llvm/test/CodeGen/SystemZ/stackmap.ll

  Log Message:
  -----------
  [SystemZ] Enable MachineCombiner for FP reassociation (#83546)

Enable MachineCombining for FP add, sub and mul.

In order for this to work, the default instruction selection of reg/mem opcodes is disabled for ISD nodes that carry the flags that allow reassociation. The reg/mem folding is instead done after MachineCombiner by PeepholeOptimizer. SystemZInstrInfo optimizeLoadInstr() and foldMemoryOperandImpl() ("LoadMI version") have been implemented for this purpose also by this patch.



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