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Abort AdjustBBOffsetsAfter early when possible.

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llvm-svn: 147685
This commit is contained in:
Jakob Stoklund Olesen 2012-01-06 21:40:15 +00:00
parent 3237171aa4
commit 4a98287c88
1 changed files with 10 additions and 2 deletions
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12
lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -1035,14 +1035,22 @@ static bool BBIsJumpedOver(MachineBasicBlock *MBB) {
#endif // NDEBUG
void ARMConstantIslands::AdjustBBOffsetsAfter(MachineBasicBlock *BB) {
for(unsigned i = BB->getNumber() + 1, e = MF->getNumBlockIDs(); i < e; ++i) {
unsigned BBNum = BB->getNumber();
for(unsigned i = BBNum + 1, e = MF->getNumBlockIDs(); i < e; ++i) {
// Get the offset and known bits at the end of the layout predecessor.
// Include the alignment of the current block.
unsigned LogAlign = MF->getBlockNumbered(i)->getAlignment();
unsigned Offset = BBInfo[i - 1].postOffset(LogAlign);
unsigned KnownBits = BBInfo[i - 1].postKnownBits(LogAlign);
// This is where block i begins.
// This is where block i begins. Stop if the offset is already correct,
// and we have updated 2 blocks. This is the maximum number of blocks
// changed before calling this function.
if (i > BBNum + 2 &&
BBInfo[i].Offset == Offset &&
BBInfo[i].KnownBits == KnownBits)
break;
BBInfo[i].Offset = Offset;
BBInfo[i].KnownBits = KnownBits;
}