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Constant fold SIGN_EXTEND_INREG with ashr not lshr.

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llvm-svn: 47992
This commit is contained in:
Evan Cheng 2008-03-06 08:20:51 +00:00
parent 635d27b1d5
commit 9c77211639
2 changed files with 15 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -2029,7 +2029,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
APInt Val = N1C->getAPIntValue();
unsigned FromBits = MVT::getSizeInBits(cast<VTSDNode>(N2)->getVT());
Val <<= Val.getBitWidth()-FromBits;
Val = Val.lshr(Val.getBitWidth()-FromBits);
Val = Val.ashr(Val.getBitWidth()-FromBits);
return getConstant(Val, VT);
}
break;

14
test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll Normal file
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@ -0,0 +1,14 @@
; RUN: llvm-as < %s | llc -march=arm -mattr=+v6 | not grep 255
define i32 @main(i32 %argc, i8** %argv) {
entry:
br label %bb1
bb1: ; preds = %entry
%tmp3.i.i = load i8* null, align 1 ; <i8> [#uses=1]
%tmp4.i.i = icmp slt i8 %tmp3.i.i, 0 ; <i1> [#uses=1]
br i1 %tmp4.i.i, label %bb2, label %bb3
bb2: ; preds = %bb1
ret i32 1
bb3: ; preds = %bb1
ret i32 0
}