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MaskRay. LLVM's BranchProbabilityInfo assigns everymulti-successor terminator a probability distribution over itssuccessors. This post describes the estimation used when no profile isavailable and reimplements it as a standalone program.
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Estimating branch probabilities
LLVM's BranchProbabilityInfo assigns every multi-successor terminator a probability distribution over its successors. This post describes the estimation used when no profile is available and reimpleme
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Estimating branch probabilities
LLVM's BranchProbabilityInfo assigns every multi-successor terminator a probability distribution over its successors. This post describes the estimation used when no profile is available and reimplements it as a standalone program.
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Irreducible loops
The dominator tree lets us identify natural loops : a back edge T-H whose head H dominates its tail T defines a loop with the single entry H . This works only for reducible control flow graphs. Optimized machine code and decompiler output routinely contai
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Optimizing LLVM's bump allocator
BumpPtrAllocator is LLVM's bump allocator (arena allocator): each allocation bumps a pointer within a slab, and everything is freed at once when the allocator dies. It backs Clang's ASTContext , lld's makeT object pools, TableGen records, and many other a
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A deep dive into SmallVector::push_back
tl;dr This blog post describes a recent SmallVector::push_back optimization for approximately trivially copyable element types. SmallVector is LLVM's most-used container, and push_back its hot operation. For the trivially-copyable specialization the fast
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