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Use the correct value for InSignBit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48245 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2008-03-11 21:29:43 +00:00
parent ef5d194aaa
commit 9736028d84
2 changed files with 24 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@@ -892,7 +892,7 @@ bool TargetLowering::SimplifyDemandedBits(SDOperand Op,
MVT::ValueType InVT = Op.getOperand(0).getValueType(); MVT::ValueType InVT = Op.getOperand(0).getValueType();
unsigned InBits = MVT::getSizeInBits(InVT); unsigned InBits = MVT::getSizeInBits(InVT);
APInt InMask = APInt::getLowBitsSet(BitWidth, InBits); APInt InMask = APInt::getLowBitsSet(BitWidth, InBits);
APInt InSignBit = APInt::getLowBitsSet(BitWidth, InBits); APInt InSignBit = APInt::getBitsSet(BitWidth, InBits - 1, InBits);
APInt NewBits = ~InMask & NewMask; APInt NewBits = ~InMask & NewMask;
// If none of the top bits are demanded, convert this into an any_extend. // If none of the top bits are demanded, convert this into an any_extend.

23
test/CodeGen/X86/sext-select.ll Normal file
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@@ -0,0 +1,23 @@
; RUN: llvm-as < %s | llc -march=x86 | grep movsw
; PR2139
declare void @abort()
define i32 @main() {
entry:
%tmp73 = tail call i1 @return_false() ; <i8> [#uses=1]
%g.0 = select i1 %tmp73, i16 0, i16 -480 ; <i16> [#uses=2]
%tmp7778 = sext i16 %g.0 to i32 ; <i32> [#uses=1]
%tmp80 = shl i32 %tmp7778, 3 ; <i32> [#uses=2]
%tmp87 = icmp sgt i32 %tmp80, 32767 ; <i1> [#uses=1]
br i1 %tmp87, label %bb90, label %bb91
bb90: ; preds = %bb84, %bb72
tail call void @abort()
unreachable
bb91: ; preds = %bb84
ret i32 0
}
define i1 @return_false() {
ret i1 0
}