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Add some statistics for PEI register scavenging

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llvm-svn: 112084
This commit is contained in:
Jim Grosbach 2010-08-25 20:34:28 +00:00
parent 59afcdfc07
commit eab4de864e
1 changed files with 7 additions and 0 deletions
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7
lib/CodeGen/PrologEpilogInserter.cpp
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@ -36,6 +36,7 @@
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/ADT/IndexedMap.h" #include "llvm/ADT/IndexedMap.h"
#include "llvm/ADT/SmallSet.h" #include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/STLExtras.h"
#include <climits> #include <climits>
@ -46,6 +47,9 @@ char PEI::ID = 0;
INITIALIZE_PASS(PEI, "prologepilog", INITIALIZE_PASS(PEI, "prologepilog",
"Prologue/Epilogue Insertion", false, false); "Prologue/Epilogue Insertion", false, false);
STATISTIC(NumVirtualFrameRegs, "Number of virtual frame regs encountered");
STATISTIC(NumScavengedRegs, "Number of frame index regs scavenged");
/// createPrologEpilogCodeInserter - This function returns a pass that inserts /// createPrologEpilogCodeInserter - This function returns a pass that inserts
/// prolog and epilog code, and eliminates abstract frame references. /// prolog and epilog code, and eliminates abstract frame references.
/// ///
@ -873,6 +877,8 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
} }
continue; continue;
} }
++NumVirtualFrameRegs;
// If this is a def, remember that this insn defines the value. // If this is a def, remember that this insn defines the value.
// This lets us properly consider insns which re-use the scratch // This lets us properly consider insns which re-use the scratch
// register, such as r2 = sub r2, #imm, in the middle of the // register, such as r2 = sub r2, #imm, in the middle of the
@ -945,6 +951,7 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
const TargetRegisterClass *RC = Fn.getRegInfo().getRegClass(Reg); const TargetRegisterClass *RC = Fn.getRegInfo().getRegClass(Reg);
CurrentScratchReg = RS->scavengeRegister(RC, I, SPAdj); CurrentScratchReg = RS->scavengeRegister(RC, I, SPAdj);
PrevValue = Value; PrevValue = Value;
++NumScavengedRegs;
} }
// replace this reference to the virtual register with the // replace this reference to the virtual register with the
// scratch register. // scratch register.