[PATCH] D26521: [X86] Allow folding of reloads from stack slots when loading a subreg of the spilled reg

[Michael Kuperstein via llvm-commits]

mkuper updated this revision to Diff 77878.
mkuper added a comment.

Updated per comments, and rebased to show test diffs.

Also moved the code that computes MemSize to be before calling into the target's foldMemoryOperandImpl() because, apparently, the X86 implementation feels free to change MI, so accessing MI.getOperand(Idx) after the Impl call may produce unexpected results.


https://reviews.llvm.org/D26521

Files:
  include/llvm/Target/TargetInstrInfo.h
  lib/CodeGen/InlineSpiller.cpp
  lib/CodeGen/TargetInstrInfo.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/partial-fold32.ll
  test/CodeGen/X86/partial-fold64.ll
  test/CodeGen/X86/vector-half-conversions.ll

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