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This code was trying too hard. By eliminating redundant edges in the CFG

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due to switch cases going to the same place, it make #pred != #phi entries,
breaking live interval analysis.

This fixes 458.sjeng on x86 with llc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30236 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-09-10 06:36:57 +00:00
parent dc08cd56c4
commit c66764c007
1 changed files with 3 additions and 6 deletions
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9
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -970,24 +970,21 @@ void SelectionDAGLowering::visitSwitch(SwitchInst &I) {
// of the jump table. If the value of the jump table slot corresponds to
// a case statement, push the case's BB onto the vector, otherwise, push
// the default BB.
std::set<MachineBasicBlock*> UniqueBBs;
std::vector<MachineBasicBlock*> DestBBs;
uint64_t TEI = First;
for (CaseItr ii = Cases.begin(), ee = Cases.end(); ii != ee; ++TEI) {
if (cast<ConstantIntegral>(ii->first)->getRawValue() == TEI) {
DestBBs.push_back(ii->second);
UniqueBBs.insert(ii->second);
++ii;
} else {
DestBBs.push_back(Default);
UniqueBBs.insert(Default);
}
}
// Update successor info
for (std::set<MachineBasicBlock*>::iterator ii = UniqueBBs.begin(),
ee = UniqueBBs.end(); ii != ee; ++ii)
JumpTableBB->addSuccessor(*ii);
for (std::vector<MachineBasicBlock*>::iterator I = DestBBs.begin(),
E = DestBBs.end(); I != E; ++I)
JumpTableBB->addSuccessor(*I);
// Create a jump table index for this jump table, or return an existing
// one.