[PATCH] D100591: [Clang][AArch64] Disable rounding of return values for AArch64

[Andrew Savonichev via Phabricator via cfe-commits]

asavonic created this revision.
asavonic added reviewers: rjmccall, dmgreen, t.p.northover, ostannard, sdesmalen, momchil.velikov, SjoerdMeijer.
Herald added subscribers: mstorsjo, danielkiss, kristof.beyls.
asavonic requested review of this revision.
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If a return value is explicitly rounded to 64 bits, an additional
`zext` instruction is emitted, and in some cases it prevents tail call
optimization.

As discussed in D100225 <https://reviews.llvm.org/D100225>, this rounding is not necessary and can be
disabled.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100591

Files:
  clang/lib/CodeGen/TargetInfo.cpp
  clang/test/CodeGen/aarch64-varargs.c
  clang/test/CodeGen/arm64-arguments.c
  clang/test/CodeGen/arm64-microsoft-arguments.cpp
  clang/test/CodeGen/attr-noundef.cpp
  clang/test/CodeGenCXX/microsoft-abi-sret-and-byval.cpp
  clang/test/CodeGenCXX/trivial_abi.cpp

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