[PATCH] [OPENMP] Codegen for 'reduction' clause in 'parallel' directive.
Alexey Bataev
a.bataev at hotmail.com
Thu Apr 9 05:23:46 PDT 2015
Hi rjmccall, hfinkel, fraggamuffin, ejstotzer,
Emit a code for reduction clause. Next code should be emitted for reductions:
```
static kmp_critical_name lock = { 0 };
void reduce_func(void *lhs[<n>], void *rhs[<n>]) {
*(Type0*)lhs[0] = ReductionOperation0(*(Type0*)lhs[0], *(Type0*)rhs[0]);
...
*(Type<n>-1*)lhs[<n>-1] =
ReductionOperation<n>-1(*(Type<n>-1*)lhs[<n>-1],
*(Type<n>-1*)rhs[<n>-1]);
}
...
void *RedList[<n>] = {&<RHSExprs>[0], ..., &<RHSExprs>[<n>-1]};
switch (__kmpc_reduce{_nowait}(<loc>, <gtid>, <n>, sizeof(RedList), RedList, reduce_func, &<lock>)) {
case 1:
<LHSExprs>[0] = ReductionOperation0(*<LHSExprs>[0], *<RHSExprs>[0]);
...
<LHSExprs>[<n>-1] = ReductionOperation<n>-1(*<LHSExprs>[<n>-1], *<RHSExprs>[<n>-1]);
__kmpc_end_reduce{_nowait}(<loc>, <gtid>, &<lock>);
break;
case 2:
Atomic(<LHSExprs>[0] = ReductionOperation0(*<LHSExprs>[0], *<RHSExprs>[0]));
...
Atomic(<LHSExprs>[<n>-1] = ReductionOperation<n>-1(*<LHSExprs>[<n>-1], *<RHSExprs>[<n>-1]));
break;
default:;
}
```
Reduction variables are a kind of a private variables, they have private copies, but initial values are chosen in accordance with the reduction operation.
http://reviews.llvm.org/D8915
Files:
include/clang/AST/DataRecursiveASTVisitor.h
include/clang/AST/OpenMPClause.h
include/clang/AST/RecursiveASTVisitor.h
include/clang/Basic/DiagnosticSemaKinds.td
lib/AST/Stmt.cpp
lib/AST/StmtProfile.cpp
lib/CodeGen/CGOpenMPRuntime.cpp
lib/CodeGen/CGOpenMPRuntime.h
lib/CodeGen/CGStmtOpenMP.cpp
lib/CodeGen/CodeGenFunction.h
lib/Sema/SemaOpenMP.cpp
lib/Serialization/ASTReaderStmt.cpp
lib/Serialization/ASTWriterStmt.cpp
test/OpenMP/for_reduction_messages.cpp
test/OpenMP/for_simd_reduction_messages.cpp
test/OpenMP/parallel_codegen.cpp
test/OpenMP/parallel_for_reduction_messages.cpp
test/OpenMP/parallel_for_simd_reduction_messages.cpp
test/OpenMP/parallel_reduction_codegen.cpp
test/OpenMP/parallel_reduction_messages.cpp
test/OpenMP/parallel_sections_reduction_messages.cpp
test/OpenMP/sections_codegen.cpp
test/OpenMP/sections_reduction_messages.cpp
test/OpenMP/simd_reduction_messages.cpp
test/OpenMP/teams_reduction_messages.cpp
tools/libclang/CIndex.cpp
EMAIL PREFERENCES
http://reviews.llvm.org/settings/panel/emailpreferences/
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