Add option to limit the maximal number of parallel threads.
Differential Revision: http://reviews.llvm.org/D5581
llvm-svn: 219004
diff --git a/polly/lib/CodeGen/LoopGenerators.cpp b/polly/lib/CodeGen/LoopGenerators.cpp
index 491d088..10595f9 100644
--- a/polly/lib/CodeGen/LoopGenerators.cpp
+++ b/polly/lib/CodeGen/LoopGenerators.cpp
@@ -18,10 +18,16 @@
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
+#include "llvm/Support/CommandLine.h"
using namespace llvm;
using namespace polly;
+static cl::opt<int>
+ PollyNumThreads("polly-num-threads",
+ cl::desc("Number of threads to use (0 = auto)"), cl::Hidden,
+ cl::init(0));
+
// We generate a loop of either of the following structures:
//
// BeforeBB BeforeBB
@@ -185,7 +191,7 @@
F = Function::Create(Ty, Linkage, Name, M);
}
- Value *NumberOfThreads = ConstantInt::get(LongType, 0);
+ Value *NumberOfThreads = ConstantInt::get(LongType, PollyNumThreads);
Value *Args[] = {SubFn, SubFnParam, NumberOfThreads, LB, UB, Stride};
Builder.CreateCall(F, Args);