diff --git a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp index 770a5bbb0717f2..c8a26247e228bb 100644 --- a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp +++ b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp @@ -1852,6 +1852,7 @@ static bool isBitfieldExtractOpFromAnd(SelectionDAG *CurDAG, SDNode *N, VT = Opd0->getValueType(0); } else if (isOpcWithIntImmediate(Op0, ISD::SRL, SrlImm)) { Opd0 = Op0->getOperand(0); + ClampMSB = (VT == MVT::i32); } else if (BiggerPattern) { // Let's pretend a 0 shift right has been performed. // The resulting code will be at least as good as the original one diff --git a/llvm/test/CodeGen/AArch64/bitfield.ll b/llvm/test/CodeGen/AArch64/bitfield.ll index 2ea0a41466144b..58fd0db036caae 100644 --- a/llvm/test/CodeGen/AArch64/bitfield.ll +++ b/llvm/test/CodeGen/AArch64/bitfield.ll @@ -230,3 +230,16 @@ define dso_local i64 @test_sbfx64(i64* %addr) { %extended = ashr i64 %shifted, 1 ret i64 %extended } + +define i32 @test_ubfx_mask(i32 %lhs, i32 %rhs) { +; CHECK-LABEL: test_ubfx_mask: +; CHECK: lsr w0, w1, #20 + %mask = and i32 %lhs, 20 + %i7 = add i32 %mask, 1 + %i8 = xor i32 %lhs, 20 + %i9 = xor i32 %i8, %i7 + %i10 = and i32 %i9, 20 + %shift = lshr i32 %rhs, %i10 + %shift.masked = and i32 %shift, 65535 + ret i32 %shift.masked +}