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Fix a bug where we were useing HA to get the high part, which seems like it

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could cause a miscompile.  Fixing this didn't fix the two programs that fail
though.  :(

This also changes the implementation to follow the pattern selector more
closely, causing us to select 0 to li instead of lis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23189 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-01 19:38:28 +00:00
parent 50ff55c2c7
commit 393ecd6d2d
1 changed files with 10 additions and 11 deletions
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21
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -685,22 +685,21 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
case ISD::Constant: { case ISD::Constant: {
assert(N->getValueType(0) == MVT::i32); assert(N->getValueType(0) == MVT::i32);
unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue(); unsigned v = (unsigned)cast<ConstantSDNode>(N)->getValue();
unsigned Hi = HA16(v);
unsigned Lo = Lo16(v);
// NOTE: This doesn't use SelectNodeTo, because doing that will prevent // NOTE: This doesn't use SelectNodeTo, because doing that will prevent
// folding shared immediates into other the second instruction that // folding shared immediates into other the second instruction that
// uses it. // uses it.
if (Hi && Lo) { if (isInt16(v))
SDOperand Top = CurDAG->getTargetNode(PPC::LIS, MVT::i32,
getI32Imm(v >> 16));
return CurDAG->getTargetNode(PPC::ORI, MVT::i32, Top,
getI32Imm(v & 0xFFFF));
} else if (Lo) {
return CurDAG->getTargetNode(PPC::LI, MVT::i32, getI32Imm(v)); return CurDAG->getTargetNode(PPC::LI, MVT::i32, getI32Imm(v));
} else {
return CurDAG->getTargetNode(PPC::LIS, MVT::i32, getI32Imm(v >> 16)); unsigned Hi = Hi16(v);
} unsigned Lo = Lo16(v);
if (!Lo)
return CurDAG->getTargetNode(PPC::LIS, MVT::i32, getI32Imm(Hi));
SDOperand Top = CurDAG->getTargetNode(PPC::LIS, MVT::i32, getI32Imm(Hi));
return CurDAG->getTargetNode(PPC::ORI, MVT::i32, Top, getI32Imm(Lo));
} }
case ISD::UNDEF: case ISD::UNDEF:
if (N->getValueType(0) == MVT::i32) if (N->getValueType(0) == MVT::i32)