[PATCH] D145211: Relax cross-section branches

[Daniel Hoekwater via Phabricator via llvm-commits]

dhoekwater created this revision.
Herald added subscribers: hiraditya, kristof.beyls.
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dhoekwater updated this revision to Diff 502834.
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dhoekwater updated this revision to Diff 525332.
dhoekwater updated this revision to Diff 525343.
dhoekwater updated this revision to Diff 525366.
dhoekwater updated this revision to Diff 525698.
dhoekwater retitled this revision from "Add a flag to assume cross-section conditional branches must be relaxed" to "Relax cross-section branches".
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dhoekwater added reviewers: arsenm, hliao, mingmingl.
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Add a missing semicolon


dhoekwater added a comment.

Add unconditional branch relaxation for AArch64 and remove the flag


dhoekwater added a comment.

Make all getCrossSectionBranchDistance instances return uint64_t


dhoekwater added a comment.

Add checks to tests


dhoekwater added a comment.

Rebase updated changes and clang-format


Because the code layout is not known during compilation, the distance of
cross-section jumps is not knowable at compile-time. Unconditional branches
are relaxed via thunk insertion by the linker, but conditional branches
must be manually relaxed. Because of this, we should assume that any
cross-sectional conditional jumps are out of range. This assumption is
necessary for machine function splitting on Arm.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145211

Files:
  llvm/include/llvm/CodeGen/TargetInstrInfo.h
  llvm/lib/CodeGen/BranchRelaxation.cpp
  llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
  llvm/lib/Target/AArch64/AArch64InstrInfo.h
  llvm/test/CodeGen/AArch64/branch-relax-b.ll
  llvm/test/CodeGen/AArch64/branch-relax-cross-section.mir

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