AMDPGU/R600: Replace llvm_unreachable() call with LLVMContext::emitError()
Summary:
This fixes an issue on MIPS where the infinite-loop-evergreen.ll test
was failing to terminate.
Fixes PR24147.
Reviewers: arsenm, dsanders
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D11260
llvm-svn: 242410
diff --git a/llvm/lib/Target/AMDGPU/AMDILCFGStructurizer.cpp b/llvm/lib/Target/AMDGPU/AMDILCFGStructurizer.cpp
index c9b25a1..9fa2bcd 100644
--- a/llvm/lib/Target/AMDGPU/AMDILCFGStructurizer.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDILCFGStructurizer.cpp
@@ -1732,18 +1732,9 @@
FuncRep->push_back(DummyExitBlk); //insert to function
SHOWNEWBLK(DummyExitBlk, "DummyExitBlock to normalize infiniteLoop: ");
DEBUG(dbgs() << "Old branch instr: " << *BranchMI << "\n";);
- MachineBasicBlock::iterator I = BranchMI;
- unsigned ImmReg = FuncRep->getRegInfo().createVirtualRegister(I32RC);
- llvm_unreachable("Extra register needed to handle CFG");
- MachineInstr *NewMI = insertInstrBefore(I, AMDGPU::BRANCH_COND_i32);
- MachineInstrBuilder MIB(*FuncRep, NewMI);
- MIB.addMBB(LoopHeader);
- MIB.addReg(ImmReg, false);
- SHOWNEWINSTR(NewMI);
- BranchMI->eraseFromParent();
- LoopLatch->addSuccessor(DummyExitBlk);
-
- return DummyExitBlk;
+ LLVMContext &Ctx = LoopHeader->getParent()->getFunction()->getContext();
+ Ctx.emitError("Extra register needed to handle CFG");
+ return nullptr;
}
void AMDGPUCFGStructurizer::removeUnconditionalBranch(MachineBasicBlock *MBB) {