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[block-freq] Refactor LiveInterals::getSpillWeight to use the new MachineBlockFrequencyInfo methods.

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This is slightly more interesting than the previous batch of changes.
Specifically:

1. We refactor getSpillWeight to take a MachineBlockFrequencyInfo (MBFI)
object. This enables us to completely encapsulate the actual manner we
use the MachineBlockFrequencyInfo to get our spill weights. This yields
cleaner code since one does not need to fetch the actual block frequency
before getting the spill weight if all one wants it the spill weight. It
also gives us access to entry frequency which we need for our
computation.

2. Instead of having getSpillWeight take a MachineBasicBlock (as one
might think) to look up the block frequency via the MBFI object, we
instead take in a MachineInstr object. The reason for this is that the
method is supposed to return the spill weight for an instruction
according to the comments around the function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197296 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman
2013-12-14 00:53:32 +00:00
parent 530c0b8862
commit f392e88e18
5 changed files with 14 additions and 9 deletions
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3
lib/CodeGen/StackSlotColoring.cpp
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@ -142,7 +142,6 @@ void StackSlotColoring::ScanForSpillSlotRefs(MachineFunction &MF) {
for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end();
MBBI != E; ++MBBI) {
MachineBasicBlock *MBB = &*MBBI;
BlockFrequency Freq = MBFI->getBlockFreq(MBB);
for (MachineBasicBlock::iterator MII = MBB->begin(), EE = MBB->end();
MII != EE; ++MII) {
MachineInstr *MI = &*MII;
@ -157,7 +156,7 @@ void StackSlotColoring::ScanForSpillSlotRefs(MachineFunction &MF) {
continue;
LiveInterval &li = LS->getInterval(FI);
if (!MI->isDebugValue())
li.weight += LiveIntervals::getSpillWeight(false, true, Freq);
li.weight += LiveIntervals::getSpillWeight(false, true, MBFI, MI);
}
for (MachineInstr::mmo_iterator MMOI = MI->memoperands_begin(),
EE = MI->memoperands_end(); MMOI != EE; ++MMOI) {