Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.140 -> 1.141
---
Log message:
back this out
---
Diffs of the changes: (+0 -25)
DAGCombiner.cpp | 25 -------------------------
1 files changed, 25 deletions(-)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.140
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.141
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.140 Sun Apr 2 16:42:45 2006
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sun Apr 2 22:16:50 2006
@@ -819,31 +819,6 @@
TLI.getShiftAmountTy())));
}
- //These two might be better as:
- // mul x, ((1 << c) + cn) -> (x << c) + (x * cn)
- // where TargetInfo tells us cn is a cheap constant to multiply by
-
- // fold (mul x, (1 << c) + 1) -> (x << c) + x
- //FIXME: there should be a target hint to allow other constants based on
- // expense of mul
- if (N1C && isPowerOf2_64(N1C->getSignExtended() - 1)) {
- return DAG.getNode(ISD::ADD, VT,
- DAG.getNode(ISD::SHL, VT, N0,
- DAG.getConstant(Log2_64(N1C->getSignExtended() - 1),
- TLI.getShiftAmountTy())),
- N0);
- }
- // fold (mul x, (1 << c) - 1) -> (x << c) - x
- //FIXME: there should be a target hint to allow other constants based on
- // the expense of mul
- if (N1C && isPowerOf2_64(N1C->getSignExtended() + 1)) {
- return DAG.getNode(ISD::SUB, VT,
- DAG.getNode(ISD::SHL, VT, N0,
- DAG.getConstant(Log2_64(N1C->getSignExtended() + 1),
- TLI.getShiftAmountTy())),
- N0);
- }
-
// (mul (shl X, c1), c2) -> (mul X, c2 << c1)
if (N1C && N0.getOpcode() == ISD::SHL &&
isa<ConstantSDNode>(N0.getOperand(1))) {
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
