[PATCH] D54329: Mark @llvm.trap cold

[Vedant Kumar via Phabricator via llvm-commits]

vsk created this revision.
vsk added reviewers: junbuml, efriedma, brzycki, sebpop.

A call to @llvm.trap can be expected to be cold (i.e. unlikely to be
reached in a normal program execution).

Outlining paths which unconditionally trap is an important memory
saving. As the hot/cold splitting pass (imho) should not treat all
noreturn calls as cold, explicitly mark @llvm.trap cold so that it can
be outlined.

Split out of https://reviews.llvm.org/D54244.


https://reviews.llvm.org/D54329

Files:
  llvm/docs/LangRef.rst
  llvm/include/llvm/IR/Intrinsics.td
  llvm/test/Feature/intrinsics.ll
  llvm/test/Transforms/SimplifyCFG/switch-on-const-select.ll
  llvm/utils/TableGen/CodeGenIntrinsics.h
  llvm/utils/TableGen/CodeGenTarget.cpp
  llvm/utils/TableGen/IntrinsicEmitter.cpp

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