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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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2
lib/CodeGen/RegAllocBasic.cpp
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@ -223,7 +223,7 @@ unsigned RABasic::selectOrSplit(LiveInterval &VirtReg,
SmallVector<unsigned, 8> PhysRegSpillCands;
// Check for an available register in this class.
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo);
AllocationOrder Order(VirtReg.reg, *VRM, RegClassInfo, Matrix);
while (unsigned PhysReg = Order.next()) {
// Check for interference in PhysReg
switch (Matrix->checkInterference(VirtReg, PhysReg)) {