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Move the selection of the arms of the select operation up to the conditional

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part to make sure we get the side effects and to avoid confusing the CFG.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20977 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-01 07:10:02 +00:00
parent 380ae49599
commit 3071019026
1 changed files with 3 additions and 2 deletions
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5
lib/Target/PowerPC/PPCISelPattern.cpp
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@ -1365,6 +1365,9 @@ unsigned ISel::SelectExpr(SDOperand N) {
case ISD::SELECT: {
Opc = SelectSetCR0(N.getOperand(0));
unsigned TrueValue = SelectExpr(N.getOperand(1)); //Use if TRUE
unsigned FalseValue = SelectExpr(N.getOperand(2)); //Use if FALSE
// 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;
@ -1380,7 +1383,6 @@ unsigned ISel::SelectExpr(SDOperand N) {
// fallthrough --> copy0MBB
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
unsigned TrueValue = SelectExpr(N.getOperand(1)); //Use if TRUE
BuildMI(BB, Opc, 2).addReg(PPC::CR0).addMBB(sinkMBB);
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, copy0MBB);
@ -1393,7 +1395,6 @@ unsigned ISel::SelectExpr(SDOperand N) {
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
unsigned FalseValue = SelectExpr(N.getOperand(2)); //Use if FALSE
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);