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Add a bit of debug output for register scavenging

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112787 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-09-02 00:51:37 +00:00
parent b742ff084f
commit d273a003b6
1 changed files with 12 additions and 2 deletions
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14
lib/CodeGen/RegisterScavenging.cpp
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@ -21,7 +21,9 @@
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
@ -237,8 +239,11 @@ static void CreateRegClassMask(const TargetRegisterClass *RC, BitVector &Mask) {
unsigned RegScavenger::FindUnusedReg(const TargetRegisterClass *RC) const {
for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
I != E; ++I)
if (!isAliasUsed(*I))
if (!isAliasUsed(*I)) {
DEBUG(dbgs() << "Scavenger found unused reg: " << TRI->getName(*I) <<
"\n");
return *I;
}
return 0;
}
@ -349,8 +354,10 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
unsigned SReg = findSurvivorReg(I, Candidates, 25, UseMI);
// If we found an unused register there is no reason to spill it.
if (!isAliasUsed(SReg))
if (!isAliasUsed(SReg)) {
DEBUG(dbgs() << "Scavenged register: " << TRI->getName(SReg) << "\n");
return SReg;
}
assert(ScavengedReg == 0 &&
"Scavenger slot is live, unable to scavenge another register!");
@ -380,5 +387,8 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
// ScavengedReg = SReg;
ScavengedRC = RC;
DEBUG(dbgs() << "Scavenged register (with spill): " << TRI->getName(SReg) <<
"\n");
return SReg;
}