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Error out, rather than infinite looping, if constant island pass can't converge. 

llvm-svn: 78377
This commit is contained in:
Evan Cheng 2009-08-07 07:35:21 +00:00
parent b1aeeed03e
commit 82ff022ed2
1 changed files with 12 additions and 4 deletions
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16
llvm/lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -271,15 +271,23 @@ bool ARMConstantIslands::runOnMachineFunction(MachineFunction &MF) {
// Iteratively place constant pool entries and fix up branches until there
// is no change.
bool MadeChange = false;
unsigned NoCPIters = 0, NoBRIters = 0;
while (true) {
bool Change = false;
bool CPChange = false;
for (unsigned i = 0, e = CPUsers.size(); i != e; ++i)
Change |= HandleConstantPoolUser(MF, i);
CPChange |= HandleConstantPoolUser(MF, i);
if (CPChange && ++NoCPIters > 30)
llvm_unreachable("Constant Island pass failed to converge!");
DEBUG(dumpBBs());
bool BRChange = false;
for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i)
Change |= FixUpImmediateBr(MF, ImmBranches[i]);
BRChange |= FixUpImmediateBr(MF, ImmBranches[i]);
if (BRChange && ++NoBRIters > 30)
llvm_unreachable("Branch Fix Up pass failed to converge!");
DEBUG(dumpBBs());
if (!Change)
if (!CPChange && !BRChange)
break;
MadeChange = true;
}