From owner-svn-src-head@freebsd.org Sat Sep 15 21:22:51 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 61EB1108A6D2; Sat, 15 Sep 2018 21:22:51 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 12FD270A77; Sat, 15 Sep 2018 21:22:51 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 0D99718DA9; Sat, 15 Sep 2018 21:22:51 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w8FLMoOq046686; Sat, 15 Sep 2018 21:22:50 GMT (envelope-from dim@FreeBSD.org) Received: (from dim@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w8FLMot6046685; Sat, 15 Sep 2018 21:22:50 GMT (envelope-from dim@FreeBSD.org) Message-Id: <201809152122.w8FLMot6046685@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: dim set sender to dim@FreeBSD.org using -f From: Dimitry Andric Date: Sat, 15 Sep 2018 21:22:50 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338697 - head/contrib/llvm/tools/clang/lib/CodeGen X-SVN-Group: head X-SVN-Commit-Author: dim X-SVN-Commit-Paths: head/contrib/llvm/tools/clang/lib/CodeGen X-SVN-Commit-Revision: 338697 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 15 Sep 2018 21:22:51 -0000 Author: dim Date: Sat Sep 15 21:22:50 2018 New Revision: 338697 URL: https://svnweb.freebsd.org/changeset/base/338697 Log: Pull in r325478 from upstream clang trunk (by Ivan A. Kosarev): [CodeGen] Initialize large arrays by copying from a global Currently, clang compiles explicit initializers for array elements into series of store instructions. For large arrays of built-in types this results in bloated output code and significant amount of time spent on the instruction selection phase. This patch fixes the issue by initializing such arrays with global constants that store the binary image of the initializer. Differential Revision: https://reviews.llvm.org/D43181 This should fix a compiler hang (and excessive memory usage) while building the science/rmg port. Approved by: re (kib) Reported by: yuri@tsoft.com See also: https://bugs.llvm.org/show_bug.cgi?id=38798 MFC after: 3 days Modified: head/contrib/llvm/tools/clang/lib/CodeGen/CGExprAgg.cpp Modified: head/contrib/llvm/tools/clang/lib/CodeGen/CGExprAgg.cpp ============================================================================== --- head/contrib/llvm/tools/clang/lib/CodeGen/CGExprAgg.cpp Sat Sep 15 18:47:07 2018 (r338696) +++ head/contrib/llvm/tools/clang/lib/CodeGen/CGExprAgg.cpp Sat Sep 15 21:22:50 2018 (r338697) @@ -14,6 +14,7 @@ #include "CodeGenFunction.h" #include "CGObjCRuntime.h" #include "CodeGenModule.h" +#include "ConstantEmitter.h" #include "clang/AST/ASTContext.h" #include "clang/AST/DeclCXX.h" #include "clang/AST/DeclTemplate.h" @@ -85,7 +86,7 @@ class AggExprEmitter : public StmtVisitorgetNumInits(); uint64_t NumArrayElements = AType->getNumElements(); assert(NumInitElements <= NumArrayElements); + QualType elementType = + CGF.getContext().getAsArrayType(ArrayQTy)->getElementType(); + // DestPtr is an array*. Construct an elementType* by drilling // down a level. llvm::Value *zero = llvm::ConstantInt::get(CGF.SizeTy, 0); @@ -409,6 +413,29 @@ void AggExprEmitter::EmitArrayInit(Address DestPtr, ll CharUnits elementAlign = DestPtr.getAlignment().alignmentOfArrayElement(elementSize); + // Consider initializing the array by copying from a global. For this to be + // more efficient than per-element initialization, the size of the elements + // with explicit initializers should be large enough. + if (NumInitElements * elementSize.getQuantity() > 16 && + elementType.isTriviallyCopyableType(CGF.getContext())) { + CodeGen::CodeGenModule &CGM = CGF.CGM; + ConstantEmitter Emitter(CGM); + LangAS AS = ArrayQTy.getAddressSpace(); + if (llvm::Constant *C = Emitter.tryEmitForInitializer(E, AS, ArrayQTy)) { + auto GV = new llvm::GlobalVariable( + CGM.getModule(), C->getType(), + CGM.isTypeConstant(ArrayQTy, /* ExcludeCtorDtor= */ true), + llvm::GlobalValue::PrivateLinkage, C, "constinit", + /* InsertBefore= */ nullptr, llvm::GlobalVariable::NotThreadLocal, + CGM.getContext().getTargetAddressSpace(AS)); + Emitter.finalize(GV); + CharUnits Align = CGM.getContext().getTypeAlignInChars(ArrayQTy); + GV->setAlignment(Align.getQuantity()); + EmitFinalDestCopy(ArrayQTy, CGF.MakeAddrLValue(GV, ArrayQTy, Align)); + return; + } + } + // Exception safety requires us to destroy all the // already-constructed members if an initializer throws. // For that, we'll need an EH cleanup. @@ -1156,11 +1183,8 @@ void AggExprEmitter::VisitInitListExpr(InitListExpr *E // Handle initialization of an array. if (E->getType()->isArrayType()) { - QualType elementType = - CGF.getContext().getAsArrayType(E->getType())->getElementType(); - auto AType = cast(Dest.getAddress().getElementType()); - EmitArrayInit(Dest.getAddress(), AType, elementType, E); + EmitArrayInit(Dest.getAddress(), AType, E->getType(), E); return; }