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Add a mechanism for invalidating the LiveOutInfo of a PHI, and use it whenever

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a block is visited before all of its predecessors.

llvm-svn: 126378
This commit is contained in:
Cameron Zwarich 2011-02-24 10:00:16 +00:00
parent 5c9384705f
commit e79a75febe
2 changed files with 36 additions and 4 deletions
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21
include/llvm/CodeGen/FunctionLoweringInfo.h
View File

@ -101,9 +101,11 @@ public:
#endif
struct LiveOutInfo {
unsigned NumSignBits;
unsigned NumSignBits : 31;
bool IsValid : 1;
APInt KnownOne, KnownZero;
LiveOutInfo() : NumSignBits(0), KnownOne(1, 0), KnownZero(1, 0) {}
LiveOutInfo() : NumSignBits(0), IsValid(true), KnownOne(1, 0),
KnownZero(1, 0) {}
};
/// VisitedBBs - The set of basic blocks visited thus far by instruction
@ -149,7 +151,12 @@ public:
const LiveOutInfo *GetLiveOutRegInfo(unsigned Reg) {
if (!LiveOutRegInfo.inBounds(Reg))
return NULL;
return &LiveOutRegInfo[Reg];
const LiveOutInfo *LOI = &LiveOutRegInfo[Reg];
if (!LOI->IsValid)
return NULL;
return LOI;
}
/// AddLiveOutRegInfo - Adds LiveOutInfo for a register.
@ -166,6 +173,14 @@ public:
LOI.KnownZero = KnownZero;
}
/// InvalidatePHILiveOutRegInfo - Invalidates a PHI's LiveOutInfo, to be
/// called when a block is visited before all of its predecessors.
void InvalidatePHILiveOutRegInfo(const PHINode *PN) {
unsigned Reg = ValueMap[PN];
LiveOutRegInfo.grow(Reg);
LiveOutRegInfo[Reg].IsValid = false;
}
/// setByValArgumentFrameIndex - Record frame index for the byval
/// argument.
void setByValArgumentFrameIndex(const Argument *A, int FI);

19
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -832,8 +832,25 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
CheckLineNumbers(LLVMBB);
#endif
if (OptLevel != CodeGenOpt::None)
if (OptLevel != CodeGenOpt::None) {
bool AllPredsVisited = true;
for (const_pred_iterator PI = pred_begin(LLVMBB), PE = pred_end(LLVMBB);
PI != PE; ++PI) {
if (!FuncInfo->VisitedBBs.count(*PI)) {
AllPredsVisited = false;
break;
}
}
if (!AllPredsVisited) {
for (BasicBlock::const_iterator I = LLVMBB->begin(), E = LLVMBB->end();
I != E && isa<PHINode>(I); ++I) {
FuncInfo->InvalidatePHILiveOutRegInfo(cast<PHINode>(I));
}
}
FuncInfo->VisitedBBs.insert(LLVMBB);
}
FuncInfo->MBB = FuncInfo->MBBMap[LLVMBB];
FuncInfo->InsertPt = FuncInfo->MBB->getFirstNonPHI();