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don't assert and die on out of range (undefined) shifts. This fixes

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PR3334.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62352 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-01-16 20:17:02 +00:00
parent 71759c491c
commit 9029cb8363
1 changed files with 16 additions and 4 deletions
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20
lib/ExecutionEngine/Interpreter/Execution.cpp
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@ -927,7 +927,11 @@ void Interpreter::visitShl(BinaryOperator &I) {
GenericValue Src1 = getOperandValue(I.getOperand(0), SF); GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF); GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest; GenericValue Dest;
Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue()); if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.shl(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF); SetValue(&I, Dest, SF);
} }
@ -936,7 +940,11 @@ void Interpreter::visitLShr(BinaryOperator &I) {
GenericValue Src1 = getOperandValue(I.getOperand(0), SF); GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF); GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest; GenericValue Dest;
Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue()); if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.lshr(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF); SetValue(&I, Dest, SF);
} }
@ -944,8 +952,12 @@ void Interpreter::visitAShr(BinaryOperator &I) {
ExecutionContext &SF = ECStack.back(); ExecutionContext &SF = ECStack.back();
GenericValue Src1 = getOperandValue(I.getOperand(0), SF); GenericValue Src1 = getOperandValue(I.getOperand(0), SF);
GenericValue Src2 = getOperandValue(I.getOperand(1), SF); GenericValue Src2 = getOperandValue(I.getOperand(1), SF);
GenericValue Dest; GenericValue Dest;
Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue()); if (Src2.IntVal.getZExtValue() < Src1.IntVal.getBitWidth())
Dest.IntVal = Src1.IntVal.ashr(Src2.IntVal.getZExtValue());
else
Dest.IntVal = Src1.IntVal;
SetValue(&I, Dest, SF); SetValue(&I, Dest, SF);
} }