mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-06-12 13:38:21 +00:00
Revert r216862 due to a performance regression
Reported by Alexey Volkov in PR21115 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218771 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
@ -24,7 +24,6 @@
|
||||
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
|
||||
#include "llvm/CodeGen/MachineDominators.h"
|
||||
#include "llvm/CodeGen/MachineLoopInfo.h"
|
||||
#include "llvm/CodeGen/MachinePostDominators.h"
|
||||
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
||||
#include "llvm/Support/CommandLine.h"
|
||||
#include "llvm/Support/Debug.h"
|
||||
@ -56,9 +55,8 @@ namespace {
|
||||
class MachineSinking : public MachineFunctionPass {
|
||||
const TargetInstrInfo *TII;
|
||||
const TargetRegisterInfo *TRI;
|
||||
MachineRegisterInfo *MRI; // Machine register information
|
||||
MachineDominatorTree *DT; // Machine dominator tree
|
||||
MachinePostDominatorTree *PDT; // Machine post dominator tree
|
||||
MachineRegisterInfo *MRI; // Machine register information
|
||||
MachineDominatorTree *DT; // Machine dominator tree
|
||||
MachineLoopInfo *LI;
|
||||
const MachineBlockFrequencyInfo *MBFI;
|
||||
AliasAnalysis *AA;
|
||||
@ -84,10 +82,8 @@ namespace {
|
||||
MachineFunctionPass::getAnalysisUsage(AU);
|
||||
AU.addRequired<AliasAnalysis>();
|
||||
AU.addRequired<MachineDominatorTree>();
|
||||
AU.addRequired<MachinePostDominatorTree>();
|
||||
AU.addRequired<MachineLoopInfo>();
|
||||
AU.addPreserved<MachineDominatorTree>();
|
||||
AU.addPreserved<MachinePostDominatorTree>();
|
||||
AU.addPreserved<MachineLoopInfo>();
|
||||
if (UseBlockFreqInfo)
|
||||
AU.addRequired<MachineBlockFrequencyInfo>();
|
||||
@ -255,7 +251,6 @@ bool MachineSinking::runOnMachineFunction(MachineFunction &MF) {
|
||||
TRI = TM.getSubtargetImpl()->getRegisterInfo();
|
||||
MRI = &MF.getRegInfo();
|
||||
DT = &getAnalysis<MachineDominatorTree>();
|
||||
PDT = &getAnalysis<MachinePostDominatorTree>();
|
||||
LI = &getAnalysis<MachineLoopInfo>();
|
||||
MBFI = UseBlockFreqInfo ? &getAnalysis<MachineBlockFrequencyInfo>() : nullptr;
|
||||
AA = &getAnalysis<AliasAnalysis>();
|
||||
@ -474,6 +469,23 @@ static void collectDebugValues(MachineInstr *MI,
|
||||
}
|
||||
}
|
||||
|
||||
/// isPostDominatedBy - Return true if A is post dominated by B.
|
||||
static bool isPostDominatedBy(MachineBasicBlock *A, MachineBasicBlock *B) {
|
||||
|
||||
// FIXME - Use real post dominator.
|
||||
if (A->succ_size() != 2)
|
||||
return false;
|
||||
MachineBasicBlock::succ_iterator I = A->succ_begin();
|
||||
if (B == *I)
|
||||
++I;
|
||||
MachineBasicBlock *OtherSuccBlock = *I;
|
||||
if (OtherSuccBlock->succ_size() != 1 ||
|
||||
*(OtherSuccBlock->succ_begin()) != B)
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/// isProfitableToSinkTo - Return true if it is profitable to sink MI.
|
||||
bool MachineSinking::isProfitableToSinkTo(unsigned Reg, MachineInstr *MI,
|
||||
MachineBasicBlock *MBB,
|
||||
@ -485,8 +497,8 @@ bool MachineSinking::isProfitableToSinkTo(unsigned Reg, MachineInstr *MI,
|
||||
return false;
|
||||
|
||||
// It is profitable if SuccToSinkTo does not post dominate current block.
|
||||
if (!PDT->dominates(SuccToSinkTo, MBB))
|
||||
return true;
|
||||
if (!isPostDominatedBy(MBB, SuccToSinkTo))
|
||||
return true;
|
||||
|
||||
// Check if only use in post dominated block is PHI instruction.
|
||||
bool NonPHIUse = false;
|
||||
|
Reference in New Issue
Block a user