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Add some statistics for PEI register scavenging

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112084 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-08-25 20:34:28 +00:00
parent 064ff3e435
commit c52b3cced8
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/ADT/IndexedMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include <climits>
@ -46,6 +47,9 @@ char PEI::ID = 0;
INITIALIZE_PASS(PEI, "prologepilog",
"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
/// prolog and epilog code, and eliminates abstract frame references.
///
@ -873,6 +877,8 @@ void PEI::scavengeFrameVirtualRegs(MachineFunction &Fn) {
}
continue;
}
++NumVirtualFrameRegs;
// If this is a def, remember that this insn defines the value.
// This lets us properly consider insns which re-use the scratch
// 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);
CurrentScratchReg = RS->scavengeRegister(RC, I, SPAdj);
PrevValue = Value;
++NumScavengedRegs;
}
// replace this reference to the virtual register with the
// scratch register.