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Don't generate sbfx / ubfx with negative lsb field. Patch by David Conrad.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84813 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1287,7 +1287,7 @@ SDNode *ARMDAGToDAGISel::SelectV6T2BitfieldExtractOp(SDValue Op,
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assert(Srl_imm > 0 && Srl_imm < 32 && "bad amount in shift node!");
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unsigned Width = 32 - Srl_imm;
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int LSB = Srl_imm - Shl_imm;
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if ((LSB + Width) > 32)
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if (LSB < 0)
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return NULL;
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SDValue Reg0 = CurDAG->getRegister(0, MVT::i32);
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SDValue Ops[] = { Op.getOperand(0).getOperand(0),
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@ -35,3 +35,13 @@ entry:
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%tmp2 = lshr i32 %tmp, 29
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ret i32 %tmp2
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}
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define i32 @f5(i32 %a) {
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entry:
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; CHECK: f5:
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; CHECK-NOT: sbfx
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; CHECK: bx
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%tmp = shl i32 %a, 3
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%tmp2 = ashr i32 %tmp, 1
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ret i32 %tmp2
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}
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