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SplitBlockBeforeInstr() insert a unconditional branch to the next BB. This
is unnecessary when we are fixing up a conditional branch since we will be adding a unconditional branch to the destination of the original branch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33517 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -602,13 +602,17 @@ ARMConstantIslands::FixUpImmediateBranch(MachineFunction &Fn, ImmBranch &Br) {
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// direct the updated conditional branch to the fall-through block. Otherwise,
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// direct the updated conditional branch to the fall-through block. Otherwise,
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// split the MBB before the next instruction.
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// split the MBB before the next instruction.
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MachineBasicBlock *MBB = MI->getParent();
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MachineBasicBlock *MBB = MI->getParent();
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if (&MBB->back() != MI || !BBHasFallthrough(MBB))
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if (&MBB->back() != MI || !BBHasFallthrough(MBB)) {
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SplitBlockBeforeInstr(MI);
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SplitBlockBeforeInstr(MI);
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// No need for the branch to the next block. We're adding a unconditional
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// branch to the destination.
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MBB->back().eraseFromParent();
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}
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MachineBasicBlock *NextBB = next(MachineFunction::iterator(MBB));
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MachineBasicBlock *NextBB = next(MachineFunction::iterator(MBB));
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// Insert a unconditional branch and replace the conditional branch.
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// Insert a unconditional branch and replace the conditional branch.
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// Also update the ImmBranch as well as adding a new entry for the new branch.
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// Also update the ImmBranch as well as adding a new entry for the new branch.
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BuildMI(MBB, TII->get(MI->getOpcode())).addMBB(NextBB).addImm((unsigned)CC);
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BuildMI(MBB, TII->get(MI->getOpcode())).addMBB(NextBB).addImm(CC);
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Br.MI = &MBB->back();
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Br.MI = &MBB->back();
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BuildMI(MBB, TII->get(Br.UncondBr)).addMBB(DestBB);
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BuildMI(MBB, TII->get(Br.UncondBr)).addMBB(DestBB);
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unsigned MaxDisp = (Br.UncondBr == ARM::tB) ? (1<<10)*2 : (1<<23)*4;
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unsigned MaxDisp = (Br.UncondBr == ARM::tB) ? (1<<10)*2 : (1<<23)*4;
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