Roll out r126169 and r126170 in an attempt to fix the selfhost bot.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126185 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 450757f..ae63f2e 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -49,7 +49,6 @@
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/Statistic.h"
#include <algorithm>
using namespace llvm;
@@ -471,13 +470,6 @@
if (!TargetRegisterInfo::isVirtualRegister(DestReg))
continue;
- bool IsPHI = false;
- DenseMap<unsigned, unsigned>::const_iterator It = FuncInfo->PHISrcToDestMap.find(DestReg);
- if (It != FuncInfo->PHISrcToDestMap.end()) {
- IsPHI = true;
- DestReg = It->second;
- }
-
// Ignore non-scalar or non-integer values.
SDValue Src = N->getOperand(2);
EVT SrcVT = Src.getValueType();
@@ -489,27 +481,14 @@
CurDAG->ComputeMaskedBits(Src, Mask, KnownZero, KnownOne);
// Only install this information if it tells us something.
- if (!IsPHI && NumSignBits == 1 && KnownZero == 0 && KnownOne == 0)
- continue;
-
- FuncInfo->LiveOutRegInfo.grow(DestReg);
- FunctionLoweringInfo::LiveOutInfo &LOI = FuncInfo->LiveOutRegInfo[DestReg];
-
- // If this is a PHI and there is existing information, merge it with the
- // information from this block.
- if (IsPHI && LOI.IsValid) {
+ if (NumSignBits != 1 || KnownZero != 0 || KnownOne != 0) {
+ FuncInfo->LiveOutRegInfo.grow(DestReg);
FunctionLoweringInfo::LiveOutInfo &LOI =
FuncInfo->LiveOutRegInfo[DestReg];
- LOI.NumSignBits = std::min(LOI.NumSignBits, NumSignBits);
- LOI.KnownOne &= KnownOne;
- LOI.KnownZero &= KnownZero;
- continue;
+ LOI.NumSignBits = NumSignBits;
+ LOI.KnownOne = KnownOne;
+ LOI.KnownZero = KnownZero;
}
-
- LOI.NumSignBits = NumSignBits;
- LOI.KnownOne = KnownOne;
- LOI.KnownZero = KnownZero;
- LOI.IsValid = true;
} while (!Worklist.empty());
}
@@ -853,28 +832,11 @@
FastIS = TLI.createFastISel(*FuncInfo);
// Iterate over all basic blocks in the function.
- ReversePostOrderTraversal<const Function*> RPOT(&Fn);
- for (ReversePostOrderTraversal<const Function*>::rpo_iterator
- I = RPOT.begin(), E = RPOT.end(); I != E; ++I) {
- const BasicBlock *LLVMBB = *I;
+ for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) {
+ const BasicBlock *LLVMBB = &*I;
#ifndef NDEBUG
CheckLineNumbers(LLVMBB);
#endif
-
- if (EnableFastISel) {
- FuncInfo->AllPredsVisited = false;
- } else {
- FuncInfo->AllPredsVisited = true;
- for (const_pred_iterator PI = pred_begin(LLVMBB), PE = pred_end(LLVMBB);
- PI != PE; ++PI) {
- if (!FuncInfo->VisitedBBs.count(*PI)) {
- FuncInfo->AllPredsVisited = false;
- break;
- }
- }
- FuncInfo->VisitedBBs.insert(LLVMBB);
- }
-
FuncInfo->MBB = FuncInfo->MBBMap[LLVMBB];
FuncInfo->InsertPt = FuncInfo->MBB->getFirstNonPHI();