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from 7aaf99b [InstCombine] use m_APInt to allow sub with constant folds fo [...] new 4594395 [X86] Take advantage of the lzcnt instruction on btver2 archi [...]

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Summary of changes: lib/Target/X86/X86.td | 7 + lib/Target/X86/X86ISelLowering.cpp | 114 +++++++++++++ lib/Target/X86/X86ISelLowering.h | 2 + lib/Target/X86/X86InstrInfo.td | 1 + lib/Target/X86/X86Subtarget.cpp | 1 + lib/Target/X86/X86Subtarget.h | 4 + test/CodeGen/X86/lzcnt-zext-cmp.ll | 341 +++++++++++++++++++++++++++++++++++++ 7 files changed, 470 insertions(+) create mode 100644 test/CodeGen/X86/lzcnt-zext-cmp.ll