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Codegen cond&cond with two branches. This compiles (f.e.) PowerPC/and-branch.ll to:
cmpwi cr0, r4, 4 bgt cr0, LBB1_2 ;UnifiedReturnBlock LBB1_3: ;entry cmplwi cr0, r3, 0 bne cr0, LBB1_2 ;UnifiedReturnBlock instead of: cmpwi cr7, r4, 4 mfcr r2 addic r4, r3, -1 subfe r3, r4, r3 rlwinm r2, r2, 30, 31, 31 or r2, r2, r3 cmplwi cr0, r2, 0 bne cr0, LBB1_2 ;UnifiedReturnBlock LBB1_1: ;cond_true git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31232 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -888,22 +888,43 @@ void SelectionDAGLowering::FindMergedConditions(Value *Cond,
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return;
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}
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// Codegen X | Y as:
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// jmp_if_X TBB
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// TmpBB:
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// jmp_if_Y TBB
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// jmp FBB
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//
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// This requires creation of TmpBB after CurBB.
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// Create TmpBB after CurBB.
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MachineFunction::iterator BBI = CurBB;
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MachineBasicBlock *TmpBB = new MachineBasicBlock(CurBB->getBasicBlock());
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CurBB->getParent()->getBasicBlockList().insert(++BBI, TmpBB);
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// Emit the LHS condition.
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FindMergedConditions(BOp->getOperand(0), TBB, TmpBB, CurBB, Opc);
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if (Opc == Instruction::Or) {
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// Codegen X | Y as:
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// jmp_if_X TBB
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// jmp TmpBB
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// TmpBB:
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// jmp_if_Y TBB
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// jmp FBB
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//
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// Emit the RHS condition into TmpBB.
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FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, Opc);
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// Emit the LHS condition.
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FindMergedConditions(BOp->getOperand(0), TBB, TmpBB, CurBB, Opc);
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// Emit the RHS condition into TmpBB.
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FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, Opc);
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} else {
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assert(Opc == Instruction::And && "Unknown merge op!");
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// Codegen X & Y as:
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// jmp_if_X TmpBB
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// jmp FBB
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// TmpBB:
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// jmp_if_Y TBB
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// jmp FBB
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//
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// This requires creation of TmpBB after CurBB.
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// Emit the LHS condition.
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FindMergedConditions(BOp->getOperand(0), TmpBB, FBB, CurBB, Opc);
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// Emit the RHS condition into TmpBB.
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FindMergedConditions(BOp->getOperand(1), TBB, FBB, TmpBB, Opc);
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}
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}
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void SelectionDAGLowering::visitBr(BranchInst &I) {
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@ -950,12 +971,11 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
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//
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if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(CondVal)) {
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if (BOp->hasOneUse() &&
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(/*BOp->getOpcode() == Instruction::And ||*/
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(BOp->getOpcode() == Instruction::And ||
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BOp->getOpcode() == Instruction::Or)) {
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if (BOp->getOpcode() == Instruction::And)
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I.getParent()->dump();
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FindMergedConditions(BOp, Succ0MBB, Succ1MBB, CurMBB, BOp->getOpcode());
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//std::cerr << "FOUND: " << SwitchCases.size() << " merged conditions:\n";
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//I.getParent()->dump();
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visitSwitchCase(SwitchCases[0]);
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SwitchCases.erase(SwitchCases.begin());
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return;
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