Revert r312898 "[ARM] Use ADDCARRY / SUBCARRY"

It caused PR34564.

> This is a preparatory step for D34515 and also is being recommitted as its
> first version caused PR34045.
>
> This change:
>  - makes nodes ISD::ADDCARRY and ISD::SUBCARRY legal for i32
>  - lowering is done by first converting the boolean value into the carry flag
>    using (_, C) ← (ARMISD::ADDC R, -1) and converted back to an integer value
>    using (R, _) ← (ARMISD::ADDE 0, 0, C). An ARMISD::ADDE between the two
>    operations does the actual addition.
>  - for subtraction, given that ISD::SUBCARRY second result is actually a
>    borrow, we need to invert the value of the second operand and result before
>    and after using ARMISD::SUBE. We need to invert the carry result of
>    ARMISD::SUBE to preserve the semantics.
>  - given that the generic combiner may lower ISD::ADDCARRY and
>    ISD::SUBCARRYinto ISD::UADDO and ISD::USUBO we need to update their lowering
>    as well otherwise i64 operations now would require branches. This implies
>    updating the corresponding test for unsigned.
>  - add new combiner to remove the redundant conversions from/to carry flags
>    to/from boolean values (ARMISD::ADDC (ARMISD::ADDE 0, 0, C), -1) → C
>  - fixes PR34045
>
> Differential Revision: https://reviews.llvm.org/D35192

llvm-svn: 312980

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/lib/Target/ARM/ARMISelLowering.h b/llvm/lib/Target/ARM/ARMISelLowering.h
index a448cb6a2a6..40cf54586af 100644
--- a/llvm/lib/Target/ARM/ARMISelLowering.h
+++ b/llvm/lib/Target/ARM/ARMISelLowering.h
@@ -625,8 +625,7 @@ class InstrItineraryData;
     SDValue LowerGlobalTLSAddressWindows(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
-    SDValue LowerSignedALUO(SDValue Op, SelectionDAG &DAG) const;
-    SDValue LowerUnsignedALUO(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;