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RegisterCoalescer: Improve debug messages

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- Show "Considering..." message after flipping so you actually see the final
  destination vreg as destination.
- Add a message on final join, so you can grep for "Success" messages to obtain
  a list of which register got merged with which.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2014-11-19 19:46:17 +00:00
parent f5522a6b68
commit 6e0f244d1f
1 changed files with 8 additions and 6 deletions
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14
lib/CodeGen/RegisterCoalescer.cpp
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@ -1105,6 +1105,11 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
return false;
}
} else {
// When possible, let DstReg be the larger interval.
if (!CP.isPartial() && LIS->getInterval(CP.getSrcReg()).size() >
LIS->getInterval(CP.getDstReg()).size())
CP.flip();
DEBUG({
dbgs() << "\tConsidering merging to "
<< TRI->getRegClassName(CP.getNewRC()) << " with ";
@ -1117,11 +1122,6 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
dbgs() << PrintReg(CP.getSrcReg(), TRI) << " in "
<< PrintReg(CP.getDstReg(), TRI, CP.getSrcIdx()) << '\n';
});
// When possible, let DstReg be the larger interval.
if (!CP.isPartial() && LIS->getInterval(CP.getSrcReg()).size() >
LIS->getInterval(CP.getDstReg()).size())
CP.flip();
}
// Okay, attempt to join these two intervals. On failure, this returns false.
@ -1186,7 +1186,9 @@ bool RegisterCoalescer::joinCopy(MachineInstr *CopyMI, bool &Again) {
TRI->UpdateRegAllocHint(CP.getSrcReg(), CP.getDstReg(), *MF);
DEBUG({
dbgs() << "\tJoined. Result = ";
dbgs() << "\tSuccess: " << PrintReg(CP.getSrcReg(), TRI, CP.getSrcIdx())
<< " -> " << PrintReg(CP.getDstReg(), TRI, CP.getDstIdx()) << '\n';
dbgs() << "\tResult = ";
if (CP.isPhys())
dbgs() << PrintReg(CP.getDstReg(), TRI);
else