901a8160a8
Optimize castToDeclContext for 2% improvement in build times castToDeclContext is a heavily used function, and as such, it needs to be kept as slim as feasible to preserve as much performance as possible. To this end, it was observed that the function was generating suboptimal assembly code, and putting the most common execution path in the longest sequence of instructions. This patch addresses this by guiding the compiler towards generating a lookup table of offsets, which can be used to perform an addition on the pointer. This results in a 1-2% improvement on debug builds (and a negligible improvement on release). To achieve this, the switch was simplified to flatten the if statements in the default branch. In order to make the values of the switch more compact, encouraging LLVM to generate a look-up table instead of a jump table, the AST TableGen generator was modified so it can take order priority based on class inheritance. This combination allowed for a more optimal generation of the function. Of note, 2 other functions with an equivalent structure also needed to be modified. Fixes #76824
162 lines
8.5 KiB
C++
162 lines
8.5 KiB
C++
//===- TableGenBackends.h - Declarations for Clang TableGen Backends ------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations for all of the Clang TableGen
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// backends. A "TableGen backend" is just a function. See
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// "$LLVM_ROOT/utils/TableGen/TableGenBackends.h" for more info.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_UTILS_TABLEGEN_TABLEGENBACKENDS_H
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#define LLVM_CLANG_UTILS_TABLEGEN_TABLEGENBACKENDS_H
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#include <string>
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namespace llvm {
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class raw_ostream;
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class RecordKeeper;
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} // namespace llvm
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namespace clang {
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void EmitClangDeclContext(llvm::RecordKeeper &RK, llvm::raw_ostream &OS);
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/**
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@param PriorizeIfSubclassOf These classes should be prioritized in the output.
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This is useful to force enum generation/jump tables/lookup tables to be more
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compact in both size and surrounding code in hot functions. An example use is
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in Decl for classes that inherit from DeclContext, for functions like
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castFromDeclContext.
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*/
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void EmitClangASTNodes(llvm::RecordKeeper &RK, llvm::raw_ostream &OS,
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const std::string &N, const std::string &S,
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std::string_view PriorizeIfSubclassOf = "");
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void EmitClangBasicReader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangBasicWriter(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangTypeNodes(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangTypeReader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangTypeWriter(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrParserStringSwitches(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrSubjectMatchRulesParserStringSwitches(
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llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrClass(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrImpl(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrList(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrPrintList(const std::string &FieldName,
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llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrSubjectMatchRuleList(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrPCHRead(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrPCHWrite(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrTokenKinds(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrHasAttrImpl(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrSpellingListIndex(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrASTVisitor(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrTemplateInstantiate(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrParsedAttrList(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrParsedAttrImpl(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrParsedAttrKinds(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrTextNodeDump(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrNodeTraverse(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangAttrDocTable(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangDiagsDefs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS,
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const std::string &Component);
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void EmitClangDiagGroups(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangDiagsIndexName(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangSACheckers(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangCommentHTMLTags(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangCommentHTMLTagsProperties(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangCommentHTMLNamedCharacterReferences(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangCommentCommandInfo(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangCommentCommandList(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangOpcodes(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangSyntaxNodeList(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangSyntaxNodeClasses(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitNeon(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitFP16(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitBF16(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitNeonSema(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitVectorTypes(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitNeonTest(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveHeader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveBuiltins(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveBuiltinCG(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveTypeFlags(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveRangeChecks(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSveStreamingAttrs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeHeader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeBuiltins(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeBuiltinCG(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeRangeChecks(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeStreamingAttrs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitSmeBuiltinZAState(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitMveHeader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitMveBuiltinDef(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitMveBuiltinSema(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitMveBuiltinCG(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitMveBuiltinAliases(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitRVVHeader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitRVVBuiltins(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitRVVBuiltinCG(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitRVVBuiltinSema(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitCdeHeader(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitCdeBuiltinDef(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitCdeBuiltinSema(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitCdeBuiltinCG(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitCdeBuiltinAliases(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangAttrDocs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangDiagDocs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangOptDocs(llvm::RecordKeeper &Records, llvm::raw_ostream &OS);
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void EmitClangOpenCLBuiltins(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangOpenCLBuiltinHeader(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangOpenCLBuiltinTests(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitClangDataCollectors(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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void EmitTestPragmaAttributeSupportedAttributes(llvm::RecordKeeper &Records,
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llvm::raw_ostream &OS);
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} // end namespace clang
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#endif
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