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Count triangles and diamonds in early if-conversion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161783 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-08-13 21:03:27 +00:00
parent 5f6d36335b
commit 786556c268
1 changed files with 16 additions and 0 deletions
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16
lib/CodeGen/EarlyIfConversion.cpp
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@ -24,6 +24,7 @@
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SparseSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
@ -50,6 +51,11 @@ BlockInstrLimit("early-ifcvt-limit", cl::init(30), cl::Hidden,
static cl::opt<bool> Stress("stress-early-ifcvt", cl::Hidden,
cl::desc("Turn all knobs to 11"));
STATISTIC(NumDiamondsSeen, "Number of diamonds");
STATISTIC(NumDiamondsConv, "Number of diamonds converted");
STATISTIC(NumTrianglesSeen, "Number of triangles");
STATISTIC(NumTrianglesConv, "Number of triangles converted");
//===----------------------------------------------------------------------===//
// SSAIfConv
//===----------------------------------------------------------------------===//
@ -434,6 +440,10 @@ bool SSAIfConv::canConvertIf(MachineBasicBlock *MBB) {
if (!findInsertionPoint())
return false;
if (isTriangle())
++NumTrianglesSeen;
else
++NumDiamondsSeen;
return true;
}
@ -499,6 +509,12 @@ void SSAIfConv::rewritePHIOperands() {
void SSAIfConv::convertIf(SmallVectorImpl<MachineBasicBlock*> &RemovedBlocks) {
assert(Head && Tail && TBB && FBB && "Call canConvertIf first.");
// Update statistics.
if (isTriangle())
++NumTrianglesConv;
else
++NumDiamondsConv;
// Move all instructions into Head, except for the terminators.
if (TBB != Tail)
Head->splice(InsertionPoint, TBB, TBB->begin(), TBB->getFirstTerminator());