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TargetRegisterInfo: Provide a way to check assigned registers in getRegAllocationHints()

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Pass a const reference to LiveRegMatrix to getRegAllocationHints()
because some targets can prodive better hints if they can test whether a
physreg has been used for register allocation yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242340 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-07-15 22:16:00 +00:00
parent 71da3635d9
commit 2aa5727755
8 changed files with 19 additions and 10 deletions
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4
lib/CodeGen/RegAllocGreedy.cpp
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@ -637,7 +637,7 @@ unsigned RAGreedy::tryAssign(LiveInterval &VirtReg,
//===----------------------------------------------------------------------===//
unsigned RAGreedy::canReassign(LiveInterval &VirtReg, unsigned PrevReg) {
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo);
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo, Matrix);
unsigned PhysReg;
while ((PhysReg = Order.next())) {
if (PhysReg == PrevReg)
@ -2450,7 +2450,7 @@ unsigned RAGreedy::selectOrSplitImpl(LiveInterval &VirtReg,
unsigned Depth) {
unsigned CostPerUseLimit = ~0u;
// First try assigning a free register.
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo);
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo, Matrix);
if (unsigned PhysReg = tryAssign(VirtReg, Order, NewVRegs)) {
// When NewVRegs is not empty, we may have made decisions such as evicting
// a virtual register, go with the earlier decisions and use the physical