[PATCH] D101993: [SystemZ] Don't use libcall for 128 bit shifts

[Jonas Paulsson via Phabricator via llvm-commits]

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Expand 128 bit shifts instead of using a libcall.

This patch removes the 128 bit shiftlibcalls and thereby causes ExpandShiftWithUnknownAmountBit() to be called.

Some other targets choose to set ISD::SHL_PARTS to 'custom' and then do this expansion in lowerOperation(). That is probably the alternative if the code output needs to be improved (I see 3 LOCs where GCC use 2 in c-code example...).


https://reviews.llvm.org/D101993

Files:
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/test/CodeGen/SystemZ/shift-12.ll

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