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Converting SpillPlacement's BlockFrequency threshold to a ManagedStatic to avoid static constructors and destructors.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218163 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Bieneman 2014-09-19 22:46:28 +00:00
parent c58ab80f78
commit 3b5a0bf93d
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/SpillPlacement.cpp
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@ -37,6 +37,7 @@
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
using namespace llvm;
@ -61,12 +62,12 @@ void SpillPlacement::getAnalysisUsage(AnalysisUsage &AU) const {
}
namespace {
static BlockFrequency Threshold;
static ManagedStatic<BlockFrequency> Threshold;
}
/// Decision threshold. A node gets the output value 0 if the weighted sum of
/// its inputs falls in the open interval (-Threshold;Threshold).
static BlockFrequency getThreshold() { return Threshold; }
static BlockFrequency getThreshold() { return *Threshold; }
/// \brief Set the threshold for a given entry frequency.
///
@ -78,7 +79,7 @@ static void setThreshold(const BlockFrequency &Entry) {
// it. Divide by 2^13, rounding as appropriate.
uint64_t Freq = Entry.getFrequency();
uint64_t Scaled = (Freq >> 13) + bool(Freq & (1 << 12));
Threshold = std::max(UINT64_C(1), Scaled);
*Threshold = std::max(UINT64_C(1), Scaled);
}
/// Node - Each edge bundle corresponds to a Hopfield node.