Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.536.2.1.2.2 -> 1.536.2.1.2.3
---
Log message:
This happens a lot in the kernel. Getting rid of the int to ptr casts really
helps DSA
---
Diffs of the changes: (+11 -0)
InstructionCombining.cpp | 11 +++++++++++
1 files changed, 11 insertions(+)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.536.2.1.2.2
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.536.2.1.2.3
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.536.2.1.2.2 Fri Feb
23 11:24:11 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Mon Feb 26 15:34:35 2007
@@ -5921,6 +5921,17 @@
}
}
}
+
+ //and x,c -> cast int to ptr ==> cast (GEP (cast x to sbyte*), 0 - (and x,
~c)) to ptr
+ if (SrcI->getOpcode() == Instruction::And &&
isa<PointerType>(CI.getType()) && SrcI->getType()->isInteger()
+ && isa<ConstantInt>(SrcI->getOperand(1))) {
+ Value* BC = InsertCastBefore(SrcI->getOperand(0),
PointerType::get(Type::SByteTy), CI);
+ Value* Tp =
InsertNewInstBefore(BinaryOperator::createNot(SrcI->getOperand(1)), CI);
+ Tp = InsertNewInstBefore(BinaryOperator::createAnd(SrcI->getOperand(0),
Tp), CI);
+ Tp =
InsertNewInstBefore(BinaryOperator::createSub(ConstantInt::get(SrcI->getType(),
0), Tp), CI);
+ Tp = InsertNewInstBefore(new GetElementPtrInst(BC, Tp), CI);
+ return new CastInst(Tp, CI.getType());
+ }
}
return 0;
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