[llvm] r263866 - Compute some Debug Info Metadata hash key partially (NFC)
Mehdi Amini via llvm-commits
llvm-commits at lists.llvm.org
Fri Mar 18 17:59:26 PDT 2016
Author: mehdi_amini
Date: Fri Mar 18 19:59:26 2016
New Revision: 263866
URL: http://llvm.org/viewvc/llvm-project?rev=263866&view=rev
Log:
Compute some Debug Info Metadata hash key partially (NFC)
Summary:
This patch changes the computation of the hash key for DISubprogram to
be computed on a small subset of the fields. The hash is computed a
lot faster, but there might be more collision in the table.
However by carefully selecting the fields, colisions should be rare.
Using `opt` to load the IR for FastISelEmitter.cpp.o, with this patch:
- DISubprogram::getImpl() goes from 28ms to 15ms.
- DICompositeType::getImpl() goes from 6ms to 2ms
- DIDerivedType::getImpl() goes from 18 to 12ms
Reviewers: dexonsmith
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D16571
From: Mehdi Amini <mehdi.amini at apple.com>
Modified:
llvm/trunk/lib/IR/LLVMContextImpl.h
Modified: llvm/trunk/lib/IR/LLVMContextImpl.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/IR/LLVMContextImpl.h?rev=263866&r1=263865&r2=263866&view=diff
==============================================================================
--- llvm/trunk/lib/IR/LLVMContextImpl.h (original)
+++ llvm/trunk/lib/IR/LLVMContextImpl.h Fri Mar 18 19:59:26 2016
@@ -365,8 +365,7 @@ template <> struct MDNodeKeyImpl<DIDeriv
ExtraData == RHS->getRawExtraData();
}
unsigned getHashValue() const {
- return hash_combine(Tag, Name, File, Line, Scope, BaseType, SizeInBits,
- AlignInBits, OffsetInBits, Flags, ExtraData);
+ return hash_combine(Tag, Name, File, Line, Scope, BaseType, Flags);
}
};
@@ -422,9 +421,8 @@ template <> struct MDNodeKeyImpl<DICompo
Identifier == RHS->getIdentifier();
}
unsigned getHashValue() const {
- return hash_combine(Tag, Name, File, Line, Scope, BaseType, SizeInBits,
- AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
- VTableHolder, TemplateParams, Identifier);
+ return hash_combine(Name, File, Line, BaseType, Scope, Elements,
+ TemplateParams);
}
};
@@ -518,10 +516,7 @@ template <> struct MDNodeKeyImpl<DISubpr
Variables == RHS->getRawVariables();
}
unsigned getHashValue() const {
- return hash_combine(Scope, Name, LinkageName, File, Line, Type,
- IsLocalToUnit, IsDefinition, ScopeLine, ContainingType,
- Virtuality, VirtualIndex, Flags, IsOptimized,
- TemplateParams, Declaration, Variables);
+ return hash_combine(Name, Scope, File, Type, Line);
}
};
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