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| author | Evan Cheng <evan.cheng@apple.com> | 2008-03-06 08:20:51 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-03-06 08:20:51 +0000 |
| commit | 433f6f62ca858c20d5d3f561e63818c2fda06ebe (patch) | |
| tree | 1b0ac953f5512806efbfc08f3ee5d241f711be50 | |
| parent | 819a66cf2582f6d9108a7a7f4a75175d7901a8dc (diff) | |
Constant fold SIGN_EXTEND_INREG with ashr not lshr.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47992 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 2 | ||||
| -rw-r--r-- | test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll | 14 |
2 files changed, 15 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index dd1343590a..0dba4a44f5 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -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; diff --git a/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll b/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll new file mode 100644 index 0000000000..ca34275f79 --- /dev/null +++ b/test/CodeGen/ARM/2008-03-05-SxtInRegBug.ll @@ -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 +} |