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Cleanup flow, and only update the jump table we're analyzing when replacing a destination MBB.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88805 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1749,7 +1749,7 @@ bool ARMConstantIslands::ReorderThumb2JumpTables(MachineFunction &MF) {
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MachineBasicBlock *NewBB =
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AdjustJTTargetBlockForward(MBB, MI->getParent());
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if (NewBB)
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MJTI->ReplaceMBBInJumpTables(JTBBs[j], NewBB);
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MJTI->ReplaceMBBInJumpTable(JTI, JTBBs[j], NewBB);
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MadeChange = true;
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}
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}
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@ -1772,16 +1772,16 @@ AdjustJTTargetBlockForward(MachineBasicBlock *BB, MachineBasicBlock *JTBB)
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int Size = BBSizes[BBI];
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MachineBasicBlock *TBB = 0, *FBB = 0;
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SmallVector<MachineOperand, 4> Cond;
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// If the block is small and ends in an unconditional branch, move it.
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if (Size < 50 && Cond.empty()) {
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// If the block terminator isn't analyzable, don't try to move the block
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if (TII->AnalyzeBranch(*BB, TBB, FBB, Cond))
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return NULL;
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// If the block is small and ends in an unconditional branch, move it.
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if (Size < 50 && Cond.empty()) {
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MachineFunction::iterator OldPrior = prior(BB);
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BB->moveAfter(JTBB);
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OldPrior->updateTerminator();
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//BB->updateTerminator();
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BB->updateTerminator();
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++NumJTMoved;
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return NULL;
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}
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@ -1792,20 +1792,22 @@ AdjustJTTargetBlockForward(MachineBasicBlock *BB, MachineBasicBlock *JTBB)
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MachineFunction::iterator MBBI = JTBB; ++MBBI;
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MF.insert(MBBI, NewBB);
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//MF.splice(MBBI, NewBB, NewBB);
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// Add an unconditional branch from NewBB to BB.
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// There doesn't seem to be meaningful DebugInfo available; this doesn't
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// correspond directly to anything in the source.
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assert (isThumb2 && "Adjusting for TB[BH] but not in Thumb2?");
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BuildMI(NewBB, DebugLoc::getUnknownLoc(), TII->get(ARM::t2B)).addMBB(BB);
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// Update internal data structures to account for the newly inserted MBB.
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MF.RenumberBlocks(NewBB);
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// Update the CFG.
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NewBB->addSuccessor(BB);
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JTBB->removeSuccessor(BB);
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JTBB->addSuccessor(NewBB);
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// Update internal data structures to account for the newly inserted MBB.
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MF.RenumberBlocks();
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// Insert a size into BBSizes to align it properly with the (newly
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// renumbered) block numbers.
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BBSizes.insert(BBSizes.begin()+NewBB->getNumber(), 0);
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