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Really fix PR1734. Carefully track which register uses are sub-register uses by

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traversing inverse register coalescing map.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-10-18 07:49:59 +00:00
parent cf1d7256d0
commit 4ae31a5d32
3 changed files with 128 additions and 14 deletions
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22
include/llvm/CodeGen/SimpleRegisterCoalescing.h
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@ -37,19 +37,24 @@ namespace llvm {
LiveIntervals *li_;
LiveVariables *lv_;
typedef IndexedMap<unsigned> Reg2RegMap;
Reg2RegMap r2rMap_;
BitVector allocatableRegs_;
DenseMap<const TargetRegisterClass*, BitVector> allocatableRCRegs_;
/// r2rMap_ - Map from register to its representative register.
///
IndexedMap<unsigned> r2rMap_;
/// r2rRevMap_ - Reverse of r2rRevMap_, i.e. Map from register to all
/// the registers it represent.
IndexedMap<std::vector<unsigned> > r2rRevMap_;
/// JoinedLIs - Keep track which register intervals have been coalesced
/// with other intervals.
BitVector JoinedLIs;
/// SubRegIdxes - Keep track of sub-register and sub-indexes.
/// SubRegIdxes - Keep track of sub-register and indexes.
///
std::vector<std::pair<unsigned, unsigned> > SubRegIdxes;
SmallVector<std::pair<unsigned, unsigned>, 32> SubRegIdxes;
public:
static char ID; // Pass identifcation, replacement for typeid
@ -132,10 +137,15 @@ namespace llvm {
bool AdjustCopiesBackFrom(LiveInterval &IntA, LiveInterval &IntB,
MachineInstr *CopyMI);
/// AddSubRegIdxPairs - Recursively mark all the registers represented by the
/// specified register as sub-registers. The recursion level is expected to be
/// shallow.
void AddSubRegIdxPairs(unsigned Reg, unsigned SubIdx);
/// lastRegisterUse - Returns the last use of the specific register between
/// cycles Start and End. It also returns the use operand by reference. It
/// returns NULL if there are no uses.
MachineInstr *lastRegisterUse(unsigned Start, unsigned End, unsigned Reg,
MachineInstr *lastRegisterUse(unsigned Start, unsigned End, unsigned Reg,
MachineOperand *&MOU);
/// findDefOperand - Returns the MachineOperand that is a def of the specific