[AArch64] Add `foldOverflowCheck` DAG combine

[paulwalker-arm]

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

15427–15430

What's the value provided here? because I only see a single use.

15435

LLVM coding standard prefers early exits, so this should be

if (Op.getOpcode() == AArch64ISD::CSEL)
  return None;

15441

Unnecessary {} for single line block. Also applies to the next if block.

15478

I guess Dave will say OpLHS here? Likewise in getCSETCondCode.

15486–15487

Perhaps a silly question but this suggests

ADC l r (CMP (CSET HS carry) 1)) == ADC l r (CMP (CSET HI carry) 1))

which at first glance doesn't look correct. Looking at the test changes I only see instances of HS and LO. Sure HS and HI both set the carry flag but for the HI case that's not enough for CSET to return 1. Am I missing something?

15493

This seems weird. You either know CsetOp is a CSET or you don't. If you do then you know exactly which operand represents the carry?

15499

Does just Op->getVTList() work here?

18673–18678

How safe is this? i.e. do all the transformations relevant to ADD and SUB also apply to these nodes. My cursory glance suggests not. Even for the cases where the opcode is checked it seems inefficient to call a bunch of try... functions we know ahead of time are useless. There's an argument performAddSubCombine should be sliced in two given there's not much overlap between the ADD and SUB cases.

But that's not your problem so I guess my question is why not just have your new opcodes call directly into foldOverflowCheck? Also the ADDS and SUBS cases look redundant?

[paulwalker-arm]

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

15435

Or rather

if (Op.getOpcode() != AArch64ISD::CSEL)
  return None;

:)

[Kmeakin]

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

15427–15430

It is used in later patches

[Kmeakin]

Incorporate feedback from reviewers

[Kmeakin]

Remove erroneous transformation of (ADC l r (CMP CSET HI carry) 1)) and (SBC l r (CMP (CSET LS carry) 1))

[paulwalker-arm]

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

15454–15457

Given these are related perhaps merge these two if blocks?

[Kmeakin]

Merge ifs with same body

[Kmeakin]

Closed by https://reviews.llvm.org/rG81904454f7cdebecedb1185d8112b630a7124350.

[manojgupta]

We are noticing a clang crash after this commit: https://github.com/llvm/llvm-project/issues/55510

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

static SDValue overflowFlagToValue(SDValue Flag, EVT VT, SelectionDAG &DAG) {
   SDLoc DL(Flag);
   SDValue Zero = DAG.getConstant(0, DL, VT);
   SDValue One = DAG.getConstant(1, DL, VT);
   SDValue CC = DAG.getConstant(AArch64CC::VS, DL, MVT::i32);
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, One, Zero, CC, Flag);
 }
 
 // This lowering is inefficient, but it will get cleaned up by
-// `performAddSubCombine`
+// `foldOverflowCheck`
 static SDValue lowerADDSUBCARRY(SDValue Op, SelectionDAG &DAG) {
   EVT VT0 = Op.getValue(0).getValueType();
   EVT VT1 = Op.getValue(1).getValueType();
 
   // Let legalize expand this if it isn't a legal type yet.
   if (!DAG.getTargetLoweringInfo().isTypeLegal(VT0)) {
     return SDValue();
   }
if (!LHS.getNode())
       return SDValue();
 
     LHS = DAG.getNode(ExtType, SDLoc(N), VT, LHS);
   }
 
   return DAG.getNode(N->getOpcode(), SDLoc(N), VT, LHS, RHS);
 }
 
+static bool isCMP(SDValue Op) {
+  return Op.getOpcode() == AArch64ISD::SUBS &&
+         !Op.getNode()->hasAnyUseOfValue(0);
+}
+
+// (CSEL 1 0 CC Cond) => CC
+// (CSEL 0 1 CC Cond) => !CC
+static Optional<AArch64CC::CondCode> getCSETCondCode(SDValue Op) {
+  if (Op.getOpcode() != AArch64ISD::CSEL)
+    return None;
+  auto CC = static_cast<AArch64CC::CondCode>(Op.getConstantOperandVal(2));
+  if (CC == AArch64CC::AL || CC == AArch64CC::NV)
+    return None;
+  SDValue OpLHS = Op.getOperand(0);
+  SDValue OpRHS = Op.getOperand(1);
+  if (isOneConstant(OpLHS) && isNullConstant(OpRHS))
+    return CC;
+  if (isNullConstant(OpLHS) && isOneConstant(OpRHS))
+    return getInvertedCondCode(CC);
+
+  return None;
+}
+
+// (ADC{S} l r (CMP (CSET HS carry) 1)) => (ADC{S} l r carry)
+// (SBC{S} l r (CMP (CSET LO carry) 1)) => (SBC{S} l r carry)
+static SDValue foldOverflowCheck(SDNode *Op, SelectionDAG &DAG, bool IsAdd) {
+  SDValue CmpOp = Op->getOperand(2);
+  if (!(isCMP(CmpOp) && isOneConstant(CmpOp.getOperand(1))))
+    return SDValue();
+
+  SDValue CsetOp = CmpOp->getOperand(0);
+  auto CC = getCSETCondCode(CsetOp);
+  if (CC != (IsAdd ? AArch64CC::HS : AArch64CC::LO))
+    return SDValue();
+
+  return DAG.getNode(Op->getOpcode(), SDLoc(Op), Op->getVTList(),
+                     Op->getOperand(0), Op->getOperand(1),
+                     CsetOp.getOperand(3));
+}
+
 static SDValue performAddSubCombine(SDNode *N,
                                     TargetLowering::DAGCombinerInfo &DCI,
                                     SelectionDAG &DAG) {
   // Try to change sum of two reductions.
   if (SDValue Val = performAddUADDVCombine(N, DAG))
     return Val;
   if (SDValue Val = performAddDotCombine(N, DAG))
     return Val;
   if (SDValue Val = performAddCSelIntoCSinc(N, DAG))
     return Val;
   if (SDValue Val = performNegCSelCombine(N, DAG))
     return Val;
 
   return performAddSubLongCombine(N, DCI, DAG);
 }
 
 // Massage DAGs which we can use the high-half "long" operations on into
 // something isel will recognize better. E.g.
 //
 // (aarch64_neon_umull (extract_high vec) (dupv64 scalar)) -->
 //   (aarch64_neon_umull (extract_high (v2i64 vec)))
 //                     (extract_high (v2i64 (dup128 scalar)))))
 //
 static SDValue tryCombineLongOpWithDup(unsigned IID, SDNode *N,
                                        TargetLowering::DAGCombinerInfo &DCI,
                                        SelectionDAG &DAG) {
   if (DCI.isBeforeLegalizeOps())
     return SDValue();
 
   SDValue LHS = N->getOperand((IID == Intrinsic::not_intrinsic) ? 0 : 1);
   SDValue RHS = N->getOperand((IID == Intrinsic::not_intrinsic) ? 1 : 2);
   assert(LHS.getValueType().is64BitVector() &&
          RHS.getValueType().is64BitVector() &&
          "unexpected shape for long operation");
 
   // Either node could be a DUP, but it's not worth doing both of them (you'd
   // just as well use the non-high version) so look for a corresponding extract
   // operation on the other "wing".
   if (isEssentiallyExtractHighSubvector(LHS)) {
     RHS = tryExtendDUPToExtractHigh(RHS, DAG);
     if (!RHS.getNode())
SDValue AArch64TargetLowering::PerformDAGCombine(SDNode *N,
                                                  DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
   switch (N->getOpcode()) {
   default:
     LLVM_DEBUG(dbgs() << "Custom combining: skipping\n");
     break;
   case ISD::ADD:
   case ISD::SUB:
     return performAddSubCombine(N, DCI, DAG);
+  case AArch64ISD::ADC:
+  case AArch64ISD::ADCS:
+    return foldOverflowCheck(N, DAG, /* IsAdd */ true);
+  case AArch64ISD::SBC:
+  case AArch64ISD::SBCS:
+    return foldOverflowCheck(N, DAG, /* IsAdd */ false);
   case ISD::XOR:
     return performXorCombine(N, DAG, DCI, Subtarget);
   case ISD::MUL:
     return performMulCombine(N, DAG, DCI, Subtarget);
   case ISD::SINT_TO_FP:
   case ISD::UINT_TO_FP:
     return performIntToFpCombine(N, DAG, Subtarget);
   case ISD::FP_TO_SINT:

llvm/test/CodeGen/AArch64/adc.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -verify-machineinstrs < %s -mtriple=arm64-apple-ios7.0 | FileCheck --check-prefix=CHECK-LE %s
 ; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64_be-none-linux-gnu | FileCheck --check-prefix=CHECK-BE %s
 
 define i128 @test_simple(i128 %a, i128 %b, i128 %c) {
 ; CHECK-LE-LABEL: test_simple:
 ; CHECK-LE:       ; %bb.0:
 ; CHECK-LE-NEXT:    adds x8, x0, x2
-; CHECK-LE-NEXT:    cset w9, hs
-; CHECK-LE-NEXT:    cmp w9, #1
 ; CHECK-LE-NEXT:    adcs x9, x1, x3
 ; CHECK-LE-NEXT:    subs x0, x8, x4
-; CHECK-LE-NEXT:    cset w8, lo
-; CHECK-LE-NEXT:    cmp w8, #1
 ; CHECK-LE-NEXT:    sbcs x1, x9, x5
 ; CHECK-LE-NEXT:    ret
 ;
 ; CHECK-BE-LABEL: test_simple:
 ; CHECK-BE:       // %bb.0:
 ; CHECK-BE-NEXT:    adds x8, x1, x3
-; CHECK-BE-NEXT:    cset w9, hs
-; CHECK-BE-NEXT:    cmp w9, #1
 ; CHECK-BE-NEXT:    adcs x9, x0, x2
 ; CHECK-BE-NEXT:    subs x1, x8, x5
-; CHECK-BE-NEXT:    cset w8, lo
-; CHECK-BE-NEXT:    cmp w8, #1
 ; CHECK-BE-NEXT:    sbcs x0, x9, x4
 ; CHECK-BE-NEXT:    ret
 
   %valadd = add i128 %a, %b
 
   %valsub = sub i128 %valadd, %c
 
   ret i128 %valsub
 }
 
 define i128 @test_imm(i128 %a) {
 ; CHECK-LE-LABEL: test_imm:
 ; CHECK-LE:       ; %bb.0:
 ; CHECK-LE-NEXT:    adds x0, x0, #12
-; CHECK-LE-NEXT:    cset w8, hs
-; CHECK-LE-NEXT:    cmp w8, #1
 ; CHECK-LE-NEXT:    adcs x1, x1, xzr
 ; CHECK-LE-NEXT:    ret
 ;
 ; CHECK-BE-LABEL: test_imm:
 ; CHECK-BE:       // %bb.0:
 ; CHECK-BE-NEXT:    adds x1, x1, #12
-; CHECK-BE-NEXT:    cset w8, hs
-; CHECK-BE-NEXT:    cmp w8, #1
 ; CHECK-BE-NEXT:    adcs x0, x0, xzr
 ; CHECK-BE-NEXT:    ret
 
   %val = add i128 %a, 12
 
   ret i128 %val
 }
 
 define i128 @test_shifted(i128 %a, i128 %b) {
 ; CHECK-LE-LABEL: test_shifted:
 ; CHECK-LE:       ; %bb.0:
-; CHECK-LE-NEXT:    adds x0, x0, x2, lsl #45
 ; CHECK-LE-NEXT:    extr x8, x3, x2, #19
-; CHECK-LE-NEXT:    cset w9, hs
-; CHECK-LE-NEXT:    cmp w9, #1
+; CHECK-LE-NEXT:    adds x0, x0, x2, lsl #45
 ; CHECK-LE-NEXT:    adcs x1, x1, x8
 ; CHECK-LE-NEXT:    ret
 ;
 ; CHECK-BE-LABEL: test_shifted:
 ; CHECK-BE:       // %bb.0:
-; CHECK-BE-NEXT:    adds x1, x1, x3, lsl #45
 ; CHECK-BE-NEXT:    extr x8, x2, x3, #19
-; CHECK-BE-NEXT:    cset w9, hs
-; CHECK-BE-NEXT:    cmp w9, #1
+; CHECK-BE-NEXT:    adds x1, x1, x3, lsl #45
 ; CHECK-BE-NEXT:    adcs x0, x0, x8
 ; CHECK-BE-NEXT:    ret
 
   %rhs = shl i128 %b, 45
 
   %val = add i128 %a, %rhs
 
   ret i128 %val
 }
 
 define i128 @test_extended(i128 %a, i16 %b) {
 ; CHECK-LE-LABEL: test_extended:
 ; CHECK-LE:       ; %bb.0:
 ; CHECK-LE-NEXT:    ; kill: def $w2 killed $w2 def $x2
 ; CHECK-LE-NEXT:    sxth x8, w2
 ; CHECK-LE-NEXT:    adds x0, x0, w2, sxth #3
 ; CHECK-LE-NEXT:    asr x9, x8, #63
 ; CHECK-LE-NEXT:    extr x8, x9, x8, #61
-; CHECK-LE-NEXT:    cset w9, hs
-; CHECK-LE-NEXT:    cmp w9, #1
 ; CHECK-LE-NEXT:    adcs x1, x1, x8
 ; CHECK-LE-NEXT:    ret
 ;
 ; CHECK-BE-LABEL: test_extended:
 ; CHECK-BE:       // %bb.0:
 ; CHECK-BE-NEXT:    // kill: def $w2 killed $w2 def $x2
 ; CHECK-BE-NEXT:    sxth x8, w2
 ; CHECK-BE-NEXT:    adds x1, x1, w2, sxth #3
 ; CHECK-BE-NEXT:    asr x9, x8, #63
 ; CHECK-BE-NEXT:    extr x8, x9, x8, #61
-; CHECK-BE-NEXT:    cset w9, hs
-; CHECK-BE-NEXT:    cmp w9, #1
 ; CHECK-BE-NEXT:    adcs x0, x0, x8
 ; CHECK-BE-NEXT:    ret
 
   %ext = sext i16 %b to i128
   %rhs = shl i128 %ext, 3
 
   %val = add i128 %a, %rhs
 
   ret i128 %val
 }

llvm/test/CodeGen/AArch64/addcarry-crash.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s | FileCheck %s
 target triple = "arm64-apple-ios7.0"
 
 define i64 @foo(i64* nocapture readonly %ptr, i64 %a, i64 %b, i64 %c) local_unnamed_addr #0 {
 ; CHECK-LABEL: foo:
 ; CHECK:       ; %bb.0: ; %entry
 ; CHECK-NEXT:    ldr w8, [x0, #4]
 ; CHECK-NEXT:    lsr x9, x1, #32
 ; CHECK-NEXT:    cmn x3, x2
 ; CHECK-NEXT:    mul x8, x8, x9
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x0, x8, xzr
 ; CHECK-NEXT:    ret
 entry:
   %0 = lshr i64 %a, 32
   %1 = load i64, i64* %ptr, align 8
   %2 = lshr i64 %1, 32
   %3 = mul nuw i64 %2, %0
   %4 = add i64 %c, %b
   %5 = icmp ult i64 %4, %c
   %6 = zext i1 %5 to i64
   %7 = add i64 %3, %6
   ret i64 %7
 }
 
 attributes #0 = { norecurse nounwind readonly }

llvm/test/CodeGen/AArch64/arm64-atomic-128.ll

 
 define void @fetch_and_add(i128* %p, i128 %bits) {
 ; CHECK-LABEL: fetch_and_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:  .LBB6_1: // %atomicrmw.start
 ; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    ldaxp x9, x8, [x0]
 ; CHECK-NEXT:    adds x10, x9, x2
-; CHECK-NEXT:    cset w11, hs
-; CHECK-NEXT:    cmp w11, #1
 ; CHECK-NEXT:    adcs x11, x8, x3
 ; CHECK-NEXT:    stlxp w12, x10, x11, [x0]
 ; CHECK-NEXT:    cbnz w12, .LBB6_1
 ; CHECK-NEXT:  // %bb.2: // %atomicrmw.end
 ; CHECK-NEXT:    adrp x10, :got:var
 ; CHECK-NEXT:    ldr x10, [x10, :got_lo12:var]
 ; CHECK-NEXT:    stp x9, x8, [x10]
 ; CHECK-NEXT:    ret
 
   %val = atomicrmw add i128* %p, i128 %bits seq_cst
   store i128 %val, i128* @var, align 16
   ret void
 }
 
 define void @fetch_and_sub(i128* %p, i128 %bits) {
 ; CHECK-LABEL: fetch_and_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:  .LBB7_1: // %atomicrmw.start
 ; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    ldaxp x9, x8, [x0]
 ; CHECK-NEXT:    subs x10, x9, x2
-; CHECK-NEXT:    cset w11, lo
-; CHECK-NEXT:    cmp w11, #1
 ; CHECK-NEXT:    sbcs x11, x8, x3
 ; CHECK-NEXT:    stlxp w12, x10, x11, [x0]
 ; CHECK-NEXT:    cbnz w12, .LBB7_1
 ; CHECK-NEXT:  // %bb.2: // %atomicrmw.end
 ; CHECK-NEXT:    adrp x10, :got:var
 ; CHECK-NEXT:    ldr x10, [x10, :got_lo12:var]
 ; CHECK-NEXT:    stp x9, x8, [x10]
 ; CHECK-NEXT:    ret

llvm/test/CodeGen/AArch64/arm64-vabs.ll

; GISEL-NEXT:    ret
   ret <2 x i64> %absel
 }
 
 
 define <2 x i128> @uabd_i64(<2 x i64> %a, <2 x i64> %b) {
 ; CHECK-LABEL: uabd_i64:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    fmov x9, d0
-; CHECK-NEXT:    fmov x10, d1
+; CHECK-NEXT:    fmov x11, d1
 ; CHECK-NEXT:    mov.d x8, v0[1]
-; CHECK-NEXT:    mov.d x11, v1[1]
-; CHECK-NEXT:    subs x12, x9, x10
-; CHECK-NEXT:    asr x9, x9, #63
-; CHECK-NEXT:    cset w13, lo
-; CHECK-NEXT:    asr x10, x10, #63
-; CHECK-NEXT:    cmp w13, #1
-; CHECK-NEXT:    sbcs x9, x9, x10
-; CHECK-NEXT:    subs x10, x8, x11
-; CHECK-NEXT:    asr x8, x8, #63
-; CHECK-NEXT:    cset w13, lo
-; CHECK-NEXT:    asr x11, x11, #63
-; CHECK-NEXT:    cmp w13, #1
-; CHECK-NEXT:    sbcs x8, x8, x11
-; CHECK-NEXT:    asr x11, x8, #63
-; CHECK-NEXT:    eor x10, x10, x11
-; CHECK-NEXT:    eor x8, x8, x11
-; CHECK-NEXT:    subs x2, x10, x11
-; CHECK-NEXT:    asr x10, x9, #63
-; CHECK-NEXT:    cset w13, lo
-; CHECK-NEXT:    eor x12, x12, x10
-; CHECK-NEXT:    cmp w13, #1
-; CHECK-NEXT:    eor x9, x9, x10
-; CHECK-NEXT:    sbcs x3, x8, x11
-; CHECK-NEXT:    subs x8, x12, x10
-; CHECK-NEXT:    cset w11, lo
-; CHECK-NEXT:    cmp w11, #1
-; CHECK-NEXT:    sbcs x1, x9, x10
+; CHECK-NEXT:    mov.d x10, v1[1]
+; CHECK-NEXT:    asr x12, x9, #63
+; CHECK-NEXT:    asr x13, x11, #63
+; CHECK-NEXT:    subs x9, x9, x11
+; CHECK-NEXT:    sbcs x11, x12, x13
+; CHECK-NEXT:    asr x12, x8, #63
+; CHECK-NEXT:    asr x13, x10, #63
+; CHECK-NEXT:    subs x8, x8, x10
+; CHECK-NEXT:    sbcs x10, x12, x13
+; CHECK-NEXT:    asr x13, x11, #63
+; CHECK-NEXT:    asr x12, x10, #63
+; CHECK-NEXT:    eor x8, x8, x12
+; CHECK-NEXT:    eor x10, x10, x12
+; CHECK-NEXT:    subs x2, x8, x12
+; CHECK-NEXT:    eor x8, x9, x13
+; CHECK-NEXT:    sbcs x3, x10, x12
+; CHECK-NEXT:    eor x9, x11, x13
+; CHECK-NEXT:    subs x8, x8, x13
+; CHECK-NEXT:    sbcs x1, x9, x13
 ; CHECK-NEXT:    fmov d0, x8
 ; CHECK-NEXT:    mov.d v0[1], x1
 ; CHECK-NEXT:    fmov x0, d0
 ; CHECK-NEXT:    ret
   %aext = sext <2 x i64> %a to <2 x i128>
   %bext = sext <2 x i64> %b to <2 x i128>
   %abdiff = sub nsw <2 x i128> %aext, %bext
   %abcmp = icmp slt <2 x i128> %abdiff, zeroinitializer
   %ababs = sub nsw <2 x i128> zeroinitializer, %abdiff
   %absel = select <2 x i1> %abcmp, <2 x i128> %ababs, <2 x i128> %abdiff
   ret <2 x i128> %absel
 }

llvm/test/CodeGen/AArch64/atomicrmw-O0.ll

 ; NOLSE-NEXT:    b .LBB4_1
 ; NOLSE-NEXT:  .LBB4_1: // %atomicrmw.start
 ; NOLSE-NEXT:    // =>This Loop Header: Depth=1
 ; NOLSE-NEXT:    // Child Loop BB4_2 Depth 2
 ; NOLSE-NEXT:    ldr x11, [sp, #40] // 8-byte Folded Reload
 ; NOLSE-NEXT:    ldr x8, [sp, #32] // 8-byte Folded Reload
 ; NOLSE-NEXT:    ldr x13, [sp, #24] // 8-byte Folded Reload
 ; NOLSE-NEXT:    adds x14, x8, #1
-; NOLSE-NEXT:    cset w9, hs
-; NOLSE-NEXT:    subs w9, w9, #1
 ; NOLSE-NEXT:    mov x9, xzr
 ; NOLSE-NEXT:    adcs x15, x11, x9
 ; NOLSE-NEXT:  .LBB4_2: // %atomicrmw.start
 ; NOLSE-NEXT:    // Parent Loop BB4_1 Depth=1
 ; NOLSE-NEXT:    // => This Inner Loop Header: Depth=2
 ; NOLSE-NEXT:    ldaxp x10, x9, [x13]
 ; NOLSE-NEXT:    cmp x10, x8
 ; NOLSE-NEXT:    cset w12, ne

 ; LSE-NEXT:    str x8, [sp, #72] // 8-byte Folded Spill
 ; LSE-NEXT:    b .LBB4_1
 ; LSE-NEXT:  .LBB4_1: // %atomicrmw.start
 ; LSE-NEXT:    // =>This Inner Loop Header: Depth=1
 ; LSE-NEXT:    ldr x10, [sp, #72] // 8-byte Folded Reload
 ; LSE-NEXT:    ldr x8, [sp, #64] // 8-byte Folded Reload
 ; LSE-NEXT:    ldr x9, [sp, #56] // 8-byte Folded Reload
 ; LSE-NEXT:    adds x2, x8, #1
-; LSE-NEXT:    cset w11, hs
-; LSE-NEXT:    subs w11, w11, #1
 ; LSE-NEXT:    mov x11, xzr
 ; LSE-NEXT:    adcs x11, x10, x11
 ; LSE-NEXT:    // kill: def $x2 killed $x2 def $x2_x3
 ; LSE-NEXT:    mov x3, x11
 ; LSE-NEXT:    mov x0, x8
 ; LSE-NEXT:    mov x1, x10
 ; LSE-NEXT:    stp x0, x1, [sp, #8] // 16-byte Folded Spill
 ; LSE-NEXT:    caspal x0, x1, x2, x3, [x9]

llvm/test/CodeGen/AArch64/i128-math.ll

 
 declare { i128, i1 } @llvm.smul.with.overflow.i128(i128, i128)
 declare   i128       @llvm.smul.sat.i128(i128, i128)
 
 define i128 @u128_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    ret
   %1 = add i128 %x, %y
   ret i128 %1
 }
 
 define { i128, i8 } @u128_checked_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_checked_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    cset w8, hs
 ; CHECK-NEXT:    eor w2, w8, #0x1
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.uadd.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = xor i1 %3, true
   %5 = zext i1 %4 to i8
   %6 = insertvalue { i128, i8 } undef, i128 %2, 0
   %7 = insertvalue { i128, i8 } %6, i8 %5, 1
   ret { i128, i8 } %7
 }
 
 define { i128, i8 } @u128_overflowing_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_overflowing_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    cset w2, hs
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.uadd.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = zext i1 %3 to i8
   %5 = insertvalue { i128, i8 } undef, i128 %2, 0
   %6 = insertvalue { i128, i8 } %5, i8 %4, 1
   ret { i128, i8 } %6
 }
 
 define i128 @u128_saturating_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_saturating_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x8, x0, x2
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x1, x3
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csinv x0, x8, xzr, eq
 ; CHECK-NEXT:    csinv x1, x9, xzr, eq
 ; CHECK-NEXT:    ret
   %1 = tail call i128 @llvm.uadd.sat.i128(i128 %x, i128 %y)
   ret i128 %1
 }
 
 define i128 @u128_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    ret
   %1 = sub i128 %x, %y
   ret i128 %1
 }
 
 define { i128, i8 } @u128_checked_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_checked_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    cset w8, hs
 ; CHECK-NEXT:    eor w2, w8, #0x1
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.usub.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = xor i1 %3, true
   %5 = zext i1 %4 to i8
   %6 = insertvalue { i128, i8 } undef, i128 %2, 0
   %7 = insertvalue { i128, i8 } %6, i8 %5, 1
   ret { i128, i8 } %7
 }
 
 define { i128, i8 } @u128_overflowing_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_overflowing_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    cset w2, hs
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.usub.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = zext i1 %3 to i8
   %5 = insertvalue { i128, i8 } undef, i128 %2, 0
   %6 = insertvalue { i128, i8 } %5, i8 %4, 1
   ret { i128, i8 } %6
 }
 
 define i128 @u128_saturating_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: u128_saturating_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x8, x0, x2
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x1, x3
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csel x0, xzr, x8, ne
 ; CHECK-NEXT:    csel x1, xzr, x9, ne
 ; CHECK-NEXT:    ret
   %1 = tail call i128 @llvm.usub.sat.i128(i128 %x, i128 %y)
   ret i128 %1
 }
 
 define i128 @i128_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    ret
   %1 = add i128 %x, %y
   ret i128 %1
 }
 
 define { i128, i8 } @i128_checked_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_checked_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    cset w8, vs
 ; CHECK-NEXT:    eor w2, w8, #0x1
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.sadd.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = xor i1 %3, true
   %5 = zext i1 %4 to i8
   %6 = insertvalue { i128, i8 } undef, i128 %2, 0
   %7 = insertvalue { i128, i8 } %6, i8 %5, 1
   ret { i128, i8 } %7
 }
 
 define { i128, i8 } @i128_overflowing_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_overflowing_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    cset w2, vs
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.sadd.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = zext i1 %3 to i8
   %5 = insertvalue { i128, i8 } undef, i128 %2, 0
   %6 = insertvalue { i128, i8 } %5, i8 %4, 1
   ret { i128, i8 } %6
 }
 
 define i128 @i128_saturating_add(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_saturating_add:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x8, x0, x2
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x1, x3
 ; CHECK-NEXT:    asr x10, x9, #63
 ; CHECK-NEXT:    cset w11, vs
 ; CHECK-NEXT:    cmp w11, #0
 ; CHECK-NEXT:    eor x11, x10, #0x8000000000000000
 ; CHECK-NEXT:    csel x0, x10, x8, ne
 ; CHECK-NEXT:    csel x1, x11, x9, ne
 ; CHECK-NEXT:    ret
   %1 = tail call i128 @llvm.sadd.sat.i128(i128 %x, i128 %y)
   ret i128 %1
 }
 
 define i128 @i128_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    ret
   %1 = sub i128 %x, %y
   ret i128 %1
 }
 
 define { i128, i8 } @i128_checked_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_checked_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    cset w8, vs
 ; CHECK-NEXT:    eor w2, w8, #0x1
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.ssub.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = xor i1 %3, true
   %5 = zext i1 %4 to i8
   %6 = insertvalue { i128, i8 } undef, i128 %2, 0
   %7 = insertvalue { i128, i8 } %6, i8 %5, 1
   ret { i128, i8 } %7
 }
 
 define { i128, i8 } @i128_overflowing_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_overflowing_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x0, x0, x2
-; CHECK-NEXT:    cset w8, lo
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    sbcs x1, x1, x3
 ; CHECK-NEXT:    cset w2, vs
 ; CHECK-NEXT:    ret
   %1 = tail call { i128, i1 } @llvm.ssub.with.overflow.i128(i128 %x, i128 %y)
   %2 = extractvalue { i128, i1 } %1, 0
   %3 = extractvalue { i128, i1 } %1, 1
   %4 = zext i1 %3 to i8
   %5 = insertvalue { i128, i8 } undef, i128 %2, 0
   %6 = insertvalue { i128, i8 } %5, i8 %4, 1
   ret { i128, i8 } %6
 }
 
 define i128 @i128_saturating_sub(i128 %x, i128 %y) {
 ; CHECK-LABEL: i128_saturating_sub:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x8, x0, x2
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x1, x3
 ; CHECK-NEXT:    asr x10, x9, #63
 ; CHECK-NEXT:    cset w11, vs
 ; CHECK-NEXT:    cmp w11, #0
 ; CHECK-NEXT:    eor x11, x10, #0x8000000000000000
 ; CHECK-NEXT:    csel x0, x10, x8, ne
 ; CHECK-NEXT:    csel x1, x11, x9, ne
 ; CHECK-NEXT:    ret

llvm/test/CodeGen/AArch64/icmp-shift-opt.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s -mtriple=arm64-eabi | FileCheck %s
 
 ; Optimize expanded SRL/SHL used as an input of
 ; SETCC comparing it with zero by removing rotation.
 ;
 ; See https://bugs.llvm.org/show_bug.cgi?id=50197
 define i128 @opt_setcc_lt_power_of_2(i128 %a) nounwind {
 ; CHECK-LABEL: opt_setcc_lt_power_of_2:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:  .LBB0_1: // %loop
 ; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    adds x0, x0, #1
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, xzr
 ; CHECK-NEXT:    orr x8, x1, x0, lsr #60
 ; CHECK-NEXT:    cbnz x8, .LBB0_1
 ; CHECK-NEXT:  // %bb.2: // %exit
 ; CHECK-NEXT:    ret
   br label %loop
 
 loop:

llvm/test/CodeGen/AArch64/neg-abs.ll

 
 define i128 @neg_abs128(i128 %x) {
 ; CHECK-LABEL: neg_abs128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    asr x8, x1, #63
 ; CHECK-NEXT:    eor x9, x0, x8
 ; CHECK-NEXT:    eor x10, x1, x8
 ; CHECK-NEXT:    subs x0, x8, x9
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x1, x8, x10
 ; CHECK-NEXT:    ret
   %abs = tail call i128 @llvm.abs.i128(i128 %x, i1 true)
   %neg = sub nsw i128 0, %abs
   ret i128 %neg
 }
 
 

 
 define i128 @abs128(i128 %x) {
 ; CHECK-LABEL: abs128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    asr x8, x1, #63
 ; CHECK-NEXT:    eor x9, x0, x8
 ; CHECK-NEXT:    eor x10, x1, x8
 ; CHECK-NEXT:    subs x0, x9, x8
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x1, x10, x8
 ; CHECK-NEXT:    ret
   %abs = tail call i128 @llvm.abs.i128(i128 %x, i1 true)
   ret i128 %abs
 }
 

llvm/test/CodeGen/AArch64/neon-abd.ll

 }
 
 define <2 x i64> @sabd_2d(<2 x i64> %a, <2 x i64> %b) #0 {
 ; CHECK-LABEL: sabd_2d:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    mov x8, v0.d[1]
 ; CHECK-NEXT:    fmov x10, d0
 ; CHECK-NEXT:    mov x9, v1.d[1]
-; CHECK-NEXT:    subs x11, x8, x9
-; CHECK-NEXT:    asr x8, x8, #63
-; CHECK-NEXT:    cset w12, lo
-; CHECK-NEXT:    asr x9, x9, #63
-; CHECK-NEXT:    cmp w12, #1
-; CHECK-NEXT:    fmov x12, d1
-; CHECK-NEXT:    sbcs x8, x8, x9
-; CHECK-NEXT:    asr x8, x8, #63
-; CHECK-NEXT:    subs x9, x10, x12
-; CHECK-NEXT:    asr x10, x10, #63
-; CHECK-NEXT:    cset w13, lo
-; CHECK-NEXT:    asr x12, x12, #63
-; CHECK-NEXT:    cmp w13, #1
-; CHECK-NEXT:    eor x11, x11, x8
-; CHECK-NEXT:    sbcs x10, x10, x12
-; CHECK-NEXT:    sub x8, x11, x8
+; CHECK-NEXT:    asr x11, x10, #63
+; CHECK-NEXT:    asr x12, x8, #63
+; CHECK-NEXT:    asr x13, x9, #63
+; CHECK-NEXT:    subs x8, x8, x9
+; CHECK-NEXT:    fmov x9, d1
+; CHECK-NEXT:    sbcs x12, x12, x13
+; CHECK-NEXT:    asr x13, x9, #63
+; CHECK-NEXT:    subs x9, x10, x9
+; CHECK-NEXT:    sbcs x10, x11, x13
+; CHECK-NEXT:    asr x11, x12, #63
 ; CHECK-NEXT:    asr x10, x10, #63
+; CHECK-NEXT:    eor x8, x8, x11
 ; CHECK-NEXT:    eor x9, x9, x10
+; CHECK-NEXT:    sub x8, x8, x11
 ; CHECK-NEXT:    sub x9, x9, x10
 ; CHECK-NEXT:    fmov d1, x8
 ; CHECK-NEXT:    fmov d0, x9
 ; CHECK-NEXT:    mov v0.d[1], v1.d[0]
 ; CHECK-NEXT:    ret
   %a.sext = sext <2 x i64> %a to <2 x i128>
   %b.sext = sext <2 x i64> %b to <2 x i128>
   %sub = sub <2 x i128> %a.sext, %b.sext

 
 define <2 x i64> @uabd_2d(<2 x i64> %a, <2 x i64> %b) #0 {
 ; CHECK-LABEL: uabd_2d:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    mov x8, v0.d[1]
 ; CHECK-NEXT:    fmov x10, d0
 ; CHECK-NEXT:    mov x9, v1.d[1]
 ; CHECK-NEXT:    subs x8, x8, x9
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    fmov x9, d1
 ; CHECK-NEXT:    ngcs x11, xzr
 ; CHECK-NEXT:    asr x11, x11, #63
 ; CHECK-NEXT:    subs x9, x10, x9
 ; CHECK-NEXT:    eor x8, x8, x11
-; CHECK-NEXT:    cset w10, lo
-; CHECK-NEXT:    sub x8, x8, x11
-; CHECK-NEXT:    cmp w10, #1
 ; CHECK-NEXT:    ngcs x10, xzr
+; CHECK-NEXT:    sub x8, x8, x11
 ; CHECK-NEXT:    asr x10, x10, #63
-; CHECK-NEXT:    fmov d1, x8
 ; CHECK-NEXT:    eor x9, x9, x10
 ; CHECK-NEXT:    sub x9, x9, x10
+; CHECK-NEXT:    fmov d1, x8
 ; CHECK-NEXT:    fmov d0, x9
 ; CHECK-NEXT:    mov v0.d[1], v1.d[0]
 ; CHECK-NEXT:    ret
   %a.zext = zext <2 x i64> %a to <2 x i128>
   %b.zext = zext <2 x i64> %b to <2 x i128>
   %sub = sub <2 x i128> %a.zext, %b.zext
   %abs = call <2 x i128> @llvm.abs.v2i128(<2 x i128> %sub, i1 true)
   %trunc = trunc <2 x i128> %abs to <2 x i64>

llvm/test/CodeGen/AArch64/nzcv-save.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s -verify-machineinstrs -mtriple=aarch64-eabi | FileCheck %s
 
 ; DAG ends up with two uses for the flags from an ADCS node, which means they
 ; must be saved for later.
 define void @f(i256* nocapture %a, i256* nocapture %b, i256* nocapture %cc, i256* nocapture %dd) nounwind uwtable noinline ssp {
 ; CHECK-LABEL: f:
 ; CHECK:       // %bb.0: // %entry
-; CHECK-NEXT:    ldp x8, x10, [x2]
-; CHECK-NEXT:    ldp x9, x11, [x3]
-; CHECK-NEXT:    ldp x12, x13, [x2, #16]
-; CHECK-NEXT:    adds x8, x8, x9
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
-; CHECK-NEXT:    adcs x10, x10, x11
-; CHECK-NEXT:    orr x14, x13, #0x100
-; CHECK-NEXT:    cset w11, hs
-; CHECK-NEXT:    cmp w11, #1
-; CHECK-NEXT:    ldp x9, x11, [x3, #16]
-; CHECK-NEXT:    stp x8, x10, [x0]
-; CHECK-NEXT:    adcs x9, x12, x9
-; CHECK-NEXT:    cset w12, hs
-; CHECK-NEXT:    cmp w12, #1
-; CHECK-NEXT:    adcs x13, x13, x11
-; CHECK-NEXT:    cmp w12, #1
-; CHECK-NEXT:    adcs x11, x14, x11
-; CHECK-NEXT:    stp x9, x13, [x0, #16]
-; CHECK-NEXT:    stp x8, x10, [x1]
-; CHECK-NEXT:    stp x9, x11, [x1, #16]
+; CHECK-NEXT:    ldp x9, x8, [x2]
+; CHECK-NEXT:    ldp x11, x10, [x3]
+; CHECK-NEXT:    adds x9, x9, x11
+; CHECK-NEXT:    ldp x12, x11, [x2, #16]
+; CHECK-NEXT:    adcs x8, x8, x10
+; CHECK-NEXT:    ldp x13, x10, [x3, #16]
+; CHECK-NEXT:    adcs x12, x12, x13
+; CHECK-NEXT:    mrs x13, NZCV
+; CHECK-NEXT:    adcs x14, x11, x10
+; CHECK-NEXT:    orr x11, x11, #0x100
+; CHECK-NEXT:    msr NZCV, x13
+; CHECK-NEXT:    stp x9, x8, [x0]
+; CHECK-NEXT:    adcs x10, x11, x10
+; CHECK-NEXT:    stp x12, x14, [x0, #16]
+; CHECK-NEXT:    stp x9, x8, [x1]
+; CHECK-NEXT:    stp x12, x10, [x1, #16]
 ; CHECK-NEXT:    ret
 entry:
   %c = load i256, i256* %cc
   %d = load i256, i256* %dd
   %add = add nsw i256 %c, %d
   store i256 %add, i256* %a, align 8
   %or = or i256 %c, 1606938044258990275541962092341162602522202993782792835301376
   %add6 = add nsw i256 %or, %d
   store i256 %add6, i256* %b, align 8
   ret void
 }

llvm/test/CodeGen/AArch64/sadd_sat_vec.ll

; CHECK-NEXT:    ret
   %z = call <8 x i64> @llvm.sadd.sat.v8i64(<8 x i64> %x, <8 x i64> %y)
   ret <8 x i64> %z
 }
 
 define <2 x i128> @v2i128(<2 x i128> %x, <2 x i128> %y) nounwind {
 ; CHECK-LABEL: v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x8, x2, x6
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x3, x7
 ; CHECK-NEXT:    cset w10, vs
 ; CHECK-NEXT:    asr x11, x9, #63
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csel x2, x11, x8, ne
 ; CHECK-NEXT:    eor x8, x11, #0x8000000000000000
 ; CHECK-NEXT:    csel x3, x8, x9, ne
 ; CHECK-NEXT:    adds x8, x0, x4
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x1, x5
 ; CHECK-NEXT:    cset w10, vs
 ; CHECK-NEXT:    asr x11, x9, #63
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    eor x10, x11, #0x8000000000000000
 ; CHECK-NEXT:    csel x8, x11, x8, ne
 ; CHECK-NEXT:    csel x1, x10, x9, ne
 ; CHECK-NEXT:    fmov d0, x8
 ; CHECK-NEXT:    mov v0.d[1], x1
 ; CHECK-NEXT:    fmov x0, d0
 ; CHECK-NEXT:    ret
   %z = call <2 x i128> @llvm.sadd.sat.v2i128(<2 x i128> %x, <2 x i128> %y)
   ret <2 x i128> %z
 }

llvm/test/CodeGen/AArch64/ssub_sat_vec.ll

; CHECK-NEXT:    ret
   %z = call <8 x i64> @llvm.ssub.sat.v8i64(<8 x i64> %x, <8 x i64> %y)
   ret <8 x i64> %z
 }
 
 define <2 x i128> @v2i128(<2 x i128> %x, <2 x i128> %y) nounwind {
 ; CHECK-LABEL: v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x8, x2, x6
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x3, x7
 ; CHECK-NEXT:    cset w10, vs
 ; CHECK-NEXT:    asr x11, x9, #63
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csel x2, x11, x8, ne
 ; CHECK-NEXT:    eor x8, x11, #0x8000000000000000
 ; CHECK-NEXT:    csel x3, x8, x9, ne
 ; CHECK-NEXT:    subs x8, x0, x4
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x1, x5
 ; CHECK-NEXT:    cset w10, vs
 ; CHECK-NEXT:    asr x11, x9, #63
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    eor x10, x11, #0x8000000000000000
 ; CHECK-NEXT:    csel x8, x11, x8, ne
 ; CHECK-NEXT:    csel x1, x10, x9, ne
 ; CHECK-NEXT:    fmov d0, x8
 ; CHECK-NEXT:    mov v0.d[1], x1
 ; CHECK-NEXT:    fmov x0, d0
 ; CHECK-NEXT:    ret
   %z = call <2 x i128> @llvm.ssub.sat.v2i128(<2 x i128> %x, <2 x i128> %y)
   ret <2 x i128> %z
 }

llvm/test/CodeGen/AArch64/uadd_sat_vec.ll

; CHECK-NEXT:    ret
   %z = call <8 x i64> @llvm.uadd.sat.v8i64(<8 x i64> %x, <8 x i64> %y)
   ret <8 x i64> %z
 }
 
 define <2 x i128> @v2i128(<2 x i128> %x, <2 x i128> %y) nounwind {
 ; CHECK-LABEL: v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x8, x2, x6
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x3, x7
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csinv x2, x8, xzr, eq
 ; CHECK-NEXT:    csinv x3, x9, xzr, eq
 ; CHECK-NEXT:    adds x8, x0, x4
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x1, x5
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csinv x8, x8, xzr, eq
 ; CHECK-NEXT:    csinv x1, x9, xzr, eq
 ; CHECK-NEXT:    fmov d0, x8
 ; CHECK-NEXT:    mov v0.d[1], x1
 ; CHECK-NEXT:    fmov x0, d0
 ; CHECK-NEXT:    ret
   %z = call <2 x i128> @llvm.uadd.sat.v2i128(<2 x i128> %x, <2 x i128> %y)
   ret <2 x i128> %z
 }

llvm/test/CodeGen/AArch64/usub_sat_vec.ll

; CHECK-NEXT:    ret
   %z = call <8 x i64> @llvm.usub.sat.v8i64(<8 x i64> %x, <8 x i64> %y)
   ret <8 x i64> %z
 }
 
 define <2 x i128> @v2i128(<2 x i128> %x, <2 x i128> %y) nounwind {
 ; CHECK-LABEL: v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    subs x8, x2, x6
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x3, x7
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csel x2, xzr, x8, ne
 ; CHECK-NEXT:    csel x3, xzr, x9, ne
 ; CHECK-NEXT:    subs x8, x0, x4
-; CHECK-NEXT:    cset w9, lo
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    sbcs x9, x1, x5
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    cmp w10, #0
 ; CHECK-NEXT:    csel x8, xzr, x8, ne
 ; CHECK-NEXT:    csel x1, xzr, x9, ne
 ; CHECK-NEXT:    fmov d0, x8
 ; CHECK-NEXT:    mov v0.d[1], x1
 ; CHECK-NEXT:    fmov x0, d0
 ; CHECK-NEXT:    ret
   %z = call <2 x i128> @llvm.usub.sat.v2i128(<2 x i128> %x, <2 x i128> %y)
   ret <2 x i128> %z
 }

llvm/test/CodeGen/AArch64/vec_uaddo.ll

; CHECK-NEXT:    ret
   store <4 x i1> %val, <4 x i1>* %p2
   ret <4 x i32> %res
 }
 
 define <2 x i32> @uaddo_v2i128(<2 x i128> %a0, <2 x i128> %a1, <2 x i128>* %p2) nounwind {
 ; CHECK-LABEL: uaddo_v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x8, x2, x6
-; CHECK-NEXT:    cset w9, hs
-; CHECK-NEXT:    cmp w9, #1
 ; CHECK-NEXT:    adcs x9, x3, x7
 ; CHECK-NEXT:    cset w10, hs
 ; CHECK-NEXT:    adds x11, x0, x4
-; CHECK-NEXT:    cset w12, hs
-; CHECK-NEXT:    cmp w12, #1
 ; CHECK-NEXT:    adcs x12, x1, x5
 ; CHECK-NEXT:    cset w13, hs
 ; CHECK-NEXT:    fmov s0, w13
 ; CHECK-NEXT:    mov v0.s[1], w10
 ; CHECK-NEXT:    ldr x10, [sp]
 ; CHECK-NEXT:    stp x8, x9, [x10, #16]
 ; CHECK-NEXT:    shl v0.2s, v0.2s, #31
 ; CHECK-NEXT:    stp x11, x12, [x10]

llvm/test/CodeGen/AArch64/vecreduce-add-legalization.ll

; CHECK-NEXT:    ret
   %b = call i24 @llvm.vector.reduce.add.v4i24(<4 x i24> %a)
   ret i24 %b
 }
 
 define i128 @test_v2i128(<2 x i128> %a) nounwind {
 ; CHECK-LABEL: test_v2i128:
 ; CHECK:       // %bb.0:
 ; CHECK-NEXT:    adds x0, x0, x2
-; CHECK-NEXT:    cset w8, hs
-; CHECK-NEXT:    cmp w8, #1
 ; CHECK-NEXT:    adcs x1, x1, x3
 ; CHECK-NEXT:    ret
   %b = call i128 @llvm.vector.reduce.add.v2i128(<2 x i128> %a)
   ret i128 %b
 }
 
 define i32 @test_v16i32(<16 x i32> %a) nounwind {
 ; CHECK-LABEL: test_v16i32: