1 //===--- CGStmtOpenMP.cpp - Emit LLVM Code from Statements ----------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This contains code to emit OpenMP nodes as LLVM code.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "CGOpenMPRuntime.h"
15 #include "CodeGenFunction.h"
16 #include "CodeGenModule.h"
17 #include "clang/AST/Stmt.h"
18 #include "clang/AST/StmtOpenMP.h"
19 using namespace clang;
20 using namespace CodeGen;
21
22 //===----------------------------------------------------------------------===//
23 // OpenMP Directive Emission
24 //===----------------------------------------------------------------------===//
25
EmitOMPParallelDirective(const OMPParallelDirective & S)26 void CodeGenFunction::EmitOMPParallelDirective(const OMPParallelDirective &S) {
27 const CapturedStmt *CS = cast<CapturedStmt>(S.getAssociatedStmt());
28 llvm::Value *CapturedStruct = GenerateCapturedStmtArgument(*CS);
29
30 llvm::Value *OutlinedFn;
31 {
32 CodeGenFunction CGF(CGM, true);
33 CGCapturedStmtInfo CGInfo(*CS, CS->getCapturedRegionKind());
34 CGF.CapturedStmtInfo = &CGInfo;
35 OutlinedFn = CGF.GenerateCapturedStmtFunction(*CS);
36 }
37
38 // Build call __kmpc_fork_call(loc, 1, microtask, captured_struct/*context*/)
39 llvm::Value *Args[] = {
40 CGM.getOpenMPRuntime().EmitOpenMPUpdateLocation(*this, S.getLocStart()),
41 Builder.getInt32(1), // Number of arguments after 'microtask' argument
42 // (there is only one additional argument - 'context')
43 Builder.CreateBitCast(OutlinedFn,
44 CGM.getOpenMPRuntime().getKmpc_MicroPointerTy()),
45 EmitCastToVoidPtr(CapturedStruct)};
46 llvm::Constant *RTLFn = CGM.getOpenMPRuntime().CreateRuntimeFunction(
47 CGOpenMPRuntime::OMPRTL__kmpc_fork_call);
48 EmitRuntimeCall(RTLFn, Args);
49 }
50
EmitOMPSimdDirective(const OMPSimdDirective & S)51 void CodeGenFunction::EmitOMPSimdDirective(const OMPSimdDirective &S) {
52 const CapturedStmt *CS = cast<CapturedStmt>(S.getAssociatedStmt());
53 const Stmt *Body = CS->getCapturedStmt();
54 LoopStack.setParallel();
55 LoopStack.setVectorizerEnable(true);
56 for (auto C : S.clauses()) {
57 switch (C->getClauseKind()) {
58 case OMPC_safelen: {
59 RValue Len = EmitAnyExpr(cast<OMPSafelenClause>(C)->getSafelen(),
60 AggValueSlot::ignored(), true);
61 llvm::ConstantInt *Val = cast<llvm::ConstantInt>(Len.getScalarVal());
62 LoopStack.setVectorizerWidth(Val->getZExtValue());
63 // In presence of finite 'safelen', it may be unsafe to mark all
64 // the memory instructions parallel, because loop-carried
65 // dependences of 'safelen' iterations are possible.
66 LoopStack.setParallel(false);
67 break;
68 }
69 default:
70 // Not handled yet
71 ;
72 }
73 }
74 EmitStmt(Body);
75 }
76
EmitOMPForDirective(const OMPForDirective &)77 void CodeGenFunction::EmitOMPForDirective(const OMPForDirective &) {
78 llvm_unreachable("CodeGen for 'omp for' is not supported yet.");
79 }
80
EmitOMPSectionsDirective(const OMPSectionsDirective &)81 void CodeGenFunction::EmitOMPSectionsDirective(const OMPSectionsDirective &) {
82 llvm_unreachable("CodeGen for 'omp sections' is not supported yet.");
83 }
84
EmitOMPSectionDirective(const OMPSectionDirective &)85 void CodeGenFunction::EmitOMPSectionDirective(const OMPSectionDirective &) {
86 llvm_unreachable("CodeGen for 'omp section' is not supported yet.");
87 }
88
EmitOMPSingleDirective(const OMPSingleDirective &)89 void CodeGenFunction::EmitOMPSingleDirective(const OMPSingleDirective &) {
90 llvm_unreachable("CodeGen for 'omp single' is not supported yet.");
91 }
92
93 void
EmitOMPParallelForDirective(const OMPParallelForDirective &)94 CodeGenFunction::EmitOMPParallelForDirective(const OMPParallelForDirective &) {
95 llvm_unreachable("CodeGen for 'omp parallel for' is not supported yet.");
96 }
97
EmitOMPParallelSectionsDirective(const OMPParallelSectionsDirective &)98 void CodeGenFunction::EmitOMPParallelSectionsDirective(
99 const OMPParallelSectionsDirective &) {
100 llvm_unreachable("CodeGen for 'omp parallel sections' is not supported yet.");
101 }
102
103