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| author | Eric Christopher <echristo@apple.com> | 2012-04-10 18:18:10 +0000 |
|---|---|---|
| committer | Eric Christopher <echristo@apple.com> | 2012-04-10 18:18:10 +0000 |
| commit | 18112d83e7d54597bcd5870fb411c7997e02bc1e (patch) | |
| tree | 0792eea6377628b357d274eaf1e2bf8eb48ca611 /lib/CodeGen/SelectionDAG/FastISel.cpp | |
| parent | b79855ee181b0a74507022894b0f753af0041121 (diff) | |
| download | llvm-18112d83e7d54597bcd5870fb411c7997e02bc1e.tar.gz llvm-18112d83e7d54597bcd5870fb411c7997e02bc1e.tar.bz2 llvm-18112d83e7d54597bcd5870fb411c7997e02bc1e.tar.xz | |
To ensure that we have more accurate line information for a block
don't elide the branch instruction if it's the only one in the block,
otherwise it's ok.
PR9796 and rdar://11215207
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154417 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/FastISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/FastISel.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp index 5de66670b2..0c1ac6982d 100644 --- a/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -821,8 +821,11 @@ FastISel::SelectInstruction(const Instruction *I) { /// the CFG. void FastISel::FastEmitBranch(MachineBasicBlock *MSucc, DebugLoc DL) { - if (FuncInfo.MBB->isLayoutSuccessor(MSucc)) { - // The unconditional fall-through case, which needs no instructions. + + if (FuncInfo.MBB->getBasicBlock()->size() > 1 && FuncInfo.MBB->isLayoutSuccessor(MSucc)) { + // For more accurate line information if this is the only instruction + // in the block then emit it, otherwise we have the unconditional + // fall-through case, which needs no instructions. } else { // The unconditional branch case. TII.InsertBranch(*FuncInfo.MBB, MSucc, NULL, |