Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.133 -> 1.134
---
Log message:
Delete dead loads in the dag. This allows us to compile
vector.ll:test_extract_elt2 into:
_test_extract_elt2:
lfd f1, 32(r3)
blr
instead of:
_test_extract_elt2:
lfd f0, 56(r3)
lfd f0, 48(r3)
lfd f0, 40(r3)
lfd f1, 32(r3)
lfd f0, 24(r3)
lfd f0, 16(r3)
lfd f0, 8(r3)
lfd f0, 0(r3)
blr
---
Diffs of the changes: (+5 -0)
DAGCombiner.cpp | 5 +++++
1 files changed, 5 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.133
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.134
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.133 Tue Mar 28 16:19:47 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Fri Mar 31 12:06:18 2006
@@ -2261,6 +2261,11 @@
SDOperand Chain = N->getOperand(0);
SDOperand Ptr = N->getOperand(1);
SDOperand SrcValue = N->getOperand(2);
+
+ // If there are no uses of the loaded value, change uses of the chain value
+ // into uses of the chain input (i.e. delete the dead load).
+ if (N->hasNUsesOfValue(0, 0))
+ return CombineTo(N, DAG.getNode(ISD::UNDEF, N->getValueType(0)), Chain);
// If this load is directly stored, replace the load value with the stored
// value.
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