nickdesaulniers added a comment.
In D83273#2194869 <https://reviews.llvm.org/D83273#2194869>, @echristo wrote:
> That said, it's a 10% compile time regression for compiling something like
> the linux kernel or anything that's very explicit what flags they set.
Digging into the profile a little deeper:
+ 9.20% [.] getImpliedDisabledFeatures
+ 1.46% [.] llvm::X86::getImpliedFeatures
- 3.00% llvm::StringMapImpl::LookupBucketFor
+ 1.55% llvm::StringMap<clang::IdentifierInfo*,
llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator, 4096ul, 4096ul, 128ul>
>::try_emplace<clang::IdentifierInfo*>
- 1.11% llvm::StringMap<bool, llvm::MallocAllocator>::try_emplace<>
+ 1.11% clang::targets::X86TargetInfo::setFeatureEnabled
+ 1.46% [.] llvm::X86::getImpliedFeatures
so potentially a 13.23% compile time savings for the entire codebase.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D83273/new/
https://reviews.llvm.org/D83273
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