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Eliminate data relocations by using NULL instead of global empty list.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29250 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey
2006-07-21 21:15:20 +00:00
parent 60f09928a0
commit cd4317efcf
6 changed files with 50 additions and 37 deletions
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34
lib/CodeGen/RegAllocLocal.cpp
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@ -525,9 +525,11 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
// Loop over the implicit uses, making sure that they are at the head of the
// use order list, so they don't get reallocated.
for (const unsigned *ImplicitUses = TID.ImplicitUses;
*ImplicitUses; ++ImplicitUses)
MarkPhysRegRecentlyUsed(*ImplicitUses);
if (TID.ImplicitUses) {
for (const unsigned *ImplicitUses = TID.ImplicitUses;
*ImplicitUses; ++ImplicitUses)
MarkPhysRegRecentlyUsed(*ImplicitUses);
}
// Get the used operands into registers. This has the potential to spill
// incoming values if we are out of registers. Note that we completely
@ -587,19 +589,21 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
}
// Loop over the implicit defs, spilling them as well.
for (const unsigned *ImplicitDefs = TID.ImplicitDefs;
*ImplicitDefs; ++ImplicitDefs) {
unsigned Reg = *ImplicitDefs;
spillPhysReg(MBB, MI, Reg, true);
PhysRegsUseOrder.push_back(Reg);
PhysRegsUsed[Reg] = 0; // It is free and reserved now
PhysRegsEverUsed[Reg] = true;
if (TID.ImplicitDefs) {
for (const unsigned *ImplicitDefs = TID.ImplicitDefs;
*ImplicitDefs; ++ImplicitDefs) {
unsigned Reg = *ImplicitDefs;
spillPhysReg(MBB, MI, Reg, true);
PhysRegsUseOrder.push_back(Reg);
PhysRegsUsed[Reg] = 0; // It is free and reserved now
PhysRegsEverUsed[Reg] = true;
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
PhysRegsUseOrder.push_back(*AliasSet);
PhysRegsUsed[*AliasSet] = 0; // It is free and reserved now
PhysRegsEverUsed[*AliasSet] = true;
for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
*AliasSet; ++AliasSet) {
PhysRegsUseOrder.push_back(*AliasSet);
PhysRegsUsed[*AliasSet] = 0; // It is free and reserved now
PhysRegsEverUsed[*AliasSet] = true;
}
}
}