[PATCH] D71742: Added intrinsics for access to FP environment

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff created this revision.
sepavloff added reviewers: hfinkel, kpn, andrew.w.kaylor, efriedma, bkramer, cameron.mcinally, uweigand.
Herald added subscribers: jdoerfert, hiraditya.
Herald added a project: LLVM.
sepavloff added a parent revision: D71741: Add size of FP environment to DataLayout.

The change implements intrinsics 'get_fenv', 'set_fenv' and
'reset_fenv'. They are necessary to support programs where different
parts are executed in different FP environment.

Now these functions are lowered to calls of C library functions
'fegetenv' and 'fesetenv'. It is expected that targets will implement
custom lowering to proper machine instructions for better performance.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D71742

Files:
  llvm/docs/LangRef.rst
  llvm/include/llvm/CodeGen/ISDOpcodes.h
  llvm/include/llvm/IR/IRBuilder.h
  llvm/include/llvm/IR/Intrinsics.td
  llvm/include/llvm/IR/RuntimeLibcalls.def
  llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  llvm/lib/CodeGen/TargetLoweringBase.cpp
  llvm/lib/IR/IRBuilder.cpp
  llvm/lib/IR/Verifier.cpp
  llvm/test/CodeGen/Generic/fpenv.ll
  llvm/unittests/IR/IRBuilderTest.cpp

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