[PATCH] D110346: [SystemZ] Implement ISD::BITCAST for fp128 -> i128.

[Jonas Paulsson via Phabricator via llvm-commits]

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The type legalizer has by default no method of doing this bitcast other than storing and reloading the value from stack.

This patch implements a custom lowering of this operation using extractions of subregs (z13 and earlier using FP128 register pairs), or of vector elements (with vector enhancements-1 using VR128 FP registers).

(Unfortunately there is no "low" subreg for a VR128 reg, so that case had to get its own separate handling.)


https://reviews.llvm.org/D110346

Files:
  llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
  llvm/test/CodeGen/SystemZ/fp-conv-19.ll

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