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implement legalization of truncates whose results and sources need to be

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truncated, e.g. (truncate:i8 something:i16) on a 32 or 64-bit RISC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19879 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-28 22:52:50 +00:00
parent e560521f1a
commit e76ad6de40
1 changed files with 5 additions and 2 deletions
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7
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -1035,10 +1035,13 @@ SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) {
if (Result.getValueType() > NVT) // Truncate to NVT instead of VT
Result = DAG.getNode(ISD::TRUNCATE, NVT, Result);
break;
case Promote:
// The truncation is not required, because we don't guarantee anything
// about high bits anyway.
Result = PromoteOp(Node->getOperand(0));
break;
case Expand:
assert(0 && "Cannot handle expand yet");
case Promote:
assert(0 && "Cannot handle promote-promote yet");
}
break;
case ISD::SIGN_EXTEND: