From 96c2d4d945d053804c7dc0749bab81114dfdf809 Mon Sep 17 00:00:00 2001 From: Hal Finkel Date: Fri, 8 Jun 2012 15:38:21 +0000 Subject: Add the PPCCTRLoops pass: a PPC machine-code-level optimization pass to form CTR-based loop branching code. This pass is derived from the Hexagon HardwareLoops pass. The only significant enhancement over the Hexagon pass is that PPCCTRLoops will also attempt to delete the replaced add and compare operations if they are no longer otherwise used. Also, invalid preheader DebugLoc is not used. llvm-svn: 158204 --- llvm/lib/Target/PowerPC/PPCBranchSelector.cpp | 36 ++++++++++++++++++--------- 1 file changed, 24 insertions(+), 12 deletions(-) (limited to 'llvm/lib/Target/PowerPC/PPCBranchSelector.cpp') diff --git a/llvm/lib/Target/PowerPC/PPCBranchSelector.cpp b/llvm/lib/Target/PowerPC/PPCBranchSelector.cpp index 5f775e16f1c..21a0fb200f2 100644 --- a/llvm/lib/Target/PowerPC/PPCBranchSelector.cpp +++ b/llvm/lib/Target/PowerPC/PPCBranchSelector.cpp @@ -135,21 +135,33 @@ bool PPCBSel::runOnMachineFunction(MachineFunction &Fn) { MBBStartOffset += 4; continue; } - + // Otherwise, we have to expand it to a long branch. - // The BCC operands are: - // 0. PPC branch predicate - // 1. CR register - // 2. Target MBB - PPC::Predicate Pred = (PPC::Predicate)I->getOperand(0).getImm(); - unsigned CRReg = I->getOperand(1).getReg(); - MachineInstr *OldBranch = I; DebugLoc dl = OldBranch->getDebugLoc(); - - // Jump over the uncond branch inst (i.e. $PC+8) on opposite condition. - BuildMI(MBB, I, dl, TII->get(PPC::BCC)) - .addImm(PPC::InvertPredicate(Pred)).addReg(CRReg).addImm(2); + + if (I->getOpcode() == PPC::BCC) { + // The BCC operands are: + // 0. PPC branch predicate + // 1. CR register + // 2. Target MBB + PPC::Predicate Pred = (PPC::Predicate)I->getOperand(0).getImm(); + unsigned CRReg = I->getOperand(1).getReg(); + + // Jump over the uncond branch inst (i.e. $PC+8) on opposite condition. + BuildMI(MBB, I, dl, TII->get(PPC::BCC)) + .addImm(PPC::InvertPredicate(Pred)).addReg(CRReg).addImm(2); + } else if (I->getOpcode() == PPC::BDNZ) { + BuildMI(MBB, I, dl, TII->get(PPC::BDZ)).addImm(2); + } else if (I->getOpcode() == PPC::BDNZ8) { + BuildMI(MBB, I, dl, TII->get(PPC::BDZ8)).addImm(2); + } else if (I->getOpcode() == PPC::BDZ) { + BuildMI(MBB, I, dl, TII->get(PPC::BDNZ)).addImm(2); + } else if (I->getOpcode() == PPC::BDZ8) { + BuildMI(MBB, I, dl, TII->get(PPC::BDNZ8)).addImm(2); + } else { + llvm_unreachable("Unhandled branch type!"); + } // Uncond branch to the real destination. I = BuildMI(MBB, I, dl, TII->get(PPC::B)).addMBB(Dest); -- cgit v1.2.3