Changes in directory llvm/lib/CodeGen/SelectionDAG:
LegalizeDAG.cpp updated: 1.472 -> 1.473
---
Log message:
implement expand of truncate. This allows truncates from i128 to i64 to
be supported on 32-bit hosts.
---
Diffs of the changes: (+13 -0)
LegalizeDAG.cpp | 13 +++++++++++++
1 files changed, 13 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.472
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.473
--- llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:1.472 Thu Feb 8 16:16:19 2007
+++ llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp Tue Feb 13 17:55:16 2007
@@ -4859,6 +4859,19 @@
Hi = DAG.getConstant(0, NVT);
break;
+ case ISD::TRUNCATE: {
+ // The input value must be larger than this value. Expand *it*.
+ SDOperand NewLo;
+ ExpandOp(Node->getOperand(0), NewLo, Hi);
+
+ // The low part is now either the right size, or it is closer. If not the
+ // right size, make an illegal truncate so we recursively expand it.
+ if (NewLo.getValueType() != Node->getValueType(0))
+ NewLo = DAG.getNode(ISD::TRUNCATE, Node->getValueType(0), NewLo);
+ ExpandOp(NewLo, Lo, Hi);
+ break;
+ }
+
case ISD::BIT_CONVERT: {
SDOperand Tmp;
if (TLI.getOperationAction(ISD::BIT_CONVERT, VT) ==
TargetLowering::Custom){
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