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Fix a crash on: 

void foo2(vector float *A, vector float *B) {
  vector float C = (vector float)vec_cmpeq(*A, *B);
  if (!vec_any_eq(*A, *B))
    *B = (vector float){0,0,0,0};
  *A = C;
}

llvm-svn: 27808
This commit is contained in:
Chris Lattner 2006-04-18 18:28:22 +00:00
parent e2d25a1a50
commit 518834c67e
1 changed files with 24 additions and 2 deletions
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26
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -2203,8 +2203,30 @@ SDOperand PPCTargetLowering::PerformDAGCombine(SDNode *N,
break;
}
// If there are non-zero uses of the flag value, use the VCMPo node!
if (VCMPoNode && !VCMPoNode->hasNUsesOfValue(0, 1))
// If there is no VCMPo node, or if the flag value has a single use, don't
// transform this.
if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
break;
// Look at the (necessarily single) use of the flag value. If it has a
// chain, this transformation is more complex. Note that multiple things
// could use the value result, which we should ignore.
SDNode *FlagUser = 0;
for (SDNode::use_iterator UI = VCMPoNode->use_begin();
FlagUser == 0; ++UI) {
assert(UI != VCMPoNode->use_end() && "Didn't find user!");
SDNode *User = *UI;
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
if (User->getOperand(i) == SDOperand(VCMPoNode, 1)) {
FlagUser = User;
break;
}
}
}
// If the user is a MFCR instruction, we know this is safe. Otherwise we
// give up for right now.
if (FlagUser->getOpcode() == PPCISD::MFCR)
return SDOperand(VCMPoNode, 0);
}
break;