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Fix BranchCC (it's still dumb), and implement FP select (also dumb)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20935 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-03-29 22:48:55 +00:00
parent 74747861b9
commit 23afcfb063
1 changed files with 49 additions and 4 deletions
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53
lib/Target/PowerPC/PPCISelPattern.cpp
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@ -495,9 +495,10 @@ void ISel::SelectBranchCC(SDOperand N)
Select(N.getOperand(0)); //chain
SDOperand CC = N.getOperand(1);
//Giveup and do the stupid thing
//Give up and do the stupid thing
unsigned Tmp1 = SelectExpr(CC);
BuildMI(BB, PPC::BNE, 2).addReg(Tmp1).addMBB(Dest);
BuildMI(BB, PPC::CMPLWI, 2, PPC::CR0).addReg(Tmp1).addImm(0);
BuildMI(BB, PPC::BNE, 2).addReg(PPC::CR0).addMBB(Dest);
return;
}
@ -514,8 +515,52 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
Node->dump();
assert(0 && "Node not handled!\n");
case ISD::SELECT:
abort();
case ISD::SELECT: {
Tmp1 = SelectExpr(N.getOperand(0)); //Cond
// FIXME: generate FSEL here
// Create an iterator with which to insert the MBB for copying the false
// value and the MBB to hold the PHI instruction for this SetCC.
MachineBasicBlock *thisMBB = BB;
const BasicBlock *LLVM_BB = BB->getBasicBlock();
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// cmpTY cr0, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
BuildMI(BB, PPC::CMPLWI, 2, PPC::CR0).addReg(Tmp1).addImm(0);
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
unsigned TrueValue = SelectExpr(N.getOperand(1)); //Use if TRUE
BuildMI(BB, PPC::BNE, 2).addReg(PPC::CR0).addMBB(sinkMBB);
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, copy0MBB);
F->getBasicBlockList().insert(It, sinkMBB);
// Update machine-CFG edges
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
unsigned FalseValue = SelectExpr(N.getOperand(2)); //Use if FALSE
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BB = sinkMBB;
BuildMI(BB, PPC::PHI, 4, Result).addReg(FalseValue)
.addMBB(copy0MBB).addReg(TrueValue).addMBB(thisMBB);
return Result;
}
case ISD::FP_ROUND:
assert (DestType == MVT::f32 &&