[PATCH] D132554: Add helper func to get first non-alloca position

[Sebastian Neubauer via Phabricator via llvm-commits]

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The LLVM performance tips suggest that allocas should be placed at the
beginning of the entry block. So far, llvm doesn’t provide any helper to
find that position.

Add BasicBlock::getFirstNonPHIOrDbgOrAlloca and IRBuilder::SetInsertPointPastAllocas(Function*)
that get an insert position after the (static) allocas at the start of a
function and use it in ShadowStackGCLowering.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132554

Files:
  llvm/include/llvm/IR/BasicBlock.h
  llvm/include/llvm/IR/IRBuilder.h
  llvm/lib/CodeGen/ShadowStackGCLowering.cpp
  llvm/lib/IR/BasicBlock.cpp
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp

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