[InstCombine] dropRedundantMaskingOfLeftShiftInput(): truncation (PR42563)

[lebedev.ri]

Summary

That fold keeps growing and growing :(
I think this may be one of the last pieces for it.

Since D67677/D67725, the fold knowns the general form
of the pattern - where some masking is needed:
https://rise4fun.com/Alive/F5R
https://rise4fun.com/Alive/gslRa

But there is one more huge piece missing - if you are extracting some bits,
it is not impossible that the origin is wider than the extraction,
i.e. there may be a truncation. And we don't deal with that yet.

But we can, and the generalization remains fully identical:
https://rise4fun.com/Alive/Uar
https://rise4fun.com/Alive/5SW

After a preparatory cleanup i think the diff looks rather clean.
One missing piece is that in some patterns (especially pat. b),
-1 only needs to be -1 in final type, but that is for later..

https://bugs.llvm.org/show_bug.cgi?id=42563

[lebedev.ri]

Drop redundant shadowing variable.

[lebedev.ri]

Trim diff even more one last time.

[lebedev.ri]

Bump

[lebedev.ri]

Bump

[spatel]

LGTM

llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp

196

This match construct is unusual enough (not inside an 'if' statement and not testing the return value some other way) that I'd put a comment on it like:

// Peek through an optional zext of the shift amount.

[lebedev.ri]

In D69125#1732396, @spatel wrote:

LGTM

Thank you for the review.

llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp

 //   c,d,e,f) (ShiftShAmt-MaskShAmt) s>= 0 (i.e. ShiftShAmt u>= MaskShAmt)
 static Instruction *
 dropRedundantMaskingOfLeftShiftInput(BinaryOperator *OuterShift,
                                      const SimplifyQuery &Q,
                                      InstCombiner::BuilderTy &Builder) {
   assert(OuterShift->getOpcode() == Instruction::BinaryOps::Shl &&
          "The input must be 'shl'!");
 
-  Value *Masked = OuterShift->getOperand(0);
-  Value *ShiftShAmt = OuterShift->getOperand(1);
+  Value *Masked, *ShiftShAmt;
+  match(OuterShift,
+        m_Shift(m_Value(Masked), m_ZExtOrSelf(m_Value(ShiftShAmt))));
+
+  // *If* there is a truncation between an outer shift and a possibly-mask,
+  // then said truncation *must* be one-use, else we can't perform the fold.
+  Value *Trunc;
+  if (match(Masked, m_CombineAnd(m_Trunc(m_Value(Masked)), m_Value(Trunc))) &&
+      !Trunc->hasOneUse())
+    return nullptr;
 
   Type *NarrowestTy = OuterShift->getType();
   Type *WidestTy = Masked->getType();
+  bool HadTrunc = WidestTy != NarrowestTy;
+
   // The mask must be computed in a type twice as wide to ensure
   // that no bits are lost if the sum-of-shifts is wider than the base type.
   Type *ExtendedTy = WidestTy->getExtendedType();
 
   Value *MaskShAmt;
 
   // ((1 << MaskShAmt) - 1)
   auto MaskA = m_Add(m_Shl(m_One(), m_Value(MaskShAmt)), m_AllOnes());
   // (~(-1 << maskNbits))
   auto MaskB = m_Xor(m_Shl(m_AllOnes(), m_Value(MaskShAmt)), m_AllOnes());
   // (-1 >> MaskShAmt)
   auto MaskC = m_Shr(m_AllOnes(), m_Value(MaskShAmt));
   // ((-1 << MaskShAmt) >> MaskShAmt)
   auto MaskD =
       m_Shr(m_Shl(m_AllOnes(), m_Value(MaskShAmt)), m_Deferred(MaskShAmt));
 
   Value *X;
   Constant *NewMask;
 
   if (match(Masked, m_c_And(m_CombineOr(MaskA, MaskB), m_Value(X)))) {
+    match(MaskShAmt, m_ZExtOrSelf(m_Value(MaskShAmt)));
+
+    // We have two shift amounts from two different shifts. The types of those
+    // shift amounts may not match. If that's the case let's bailout now.
+    if (MaskShAmt->getType() != ShiftShAmt->getType())
+      return nullptr;
+
     // Can we simplify (MaskShAmt+ShiftShAmt) ?
     auto *SumOfShAmts = dyn_cast_or_null<Constant>(SimplifyAddInst(
         MaskShAmt, ShiftShAmt, /*IsNSW=*/false, /*IsNUW=*/false, Q));
     if (!SumOfShAmts)
       return nullptr; // Did not simplify.
     // In this pattern SumOfShAmts correlates with the number of low bits
     // that shall remain in the root value (OuterShift).
 
+    // The mask must be computed in a type twice as wide to ensure
+    // that no bits are lost if the sum-of-shifts is wider than the base type.
+    Type *ExtendedTy = WidestTy->getExtendedType();
     // An extend of an undef value becomes zero because the high bits are never
     // completely unknown. Replace the the `undef` shift amounts with final
     // shift bitwidth to ensure that the value remains undef when creating the
     // subsequent shift op.
     SumOfShAmts = replaceUndefsWith(
         SumOfShAmts, ConstantInt::get(SumOfShAmts->getType()->getScalarType(),
                                       ExtendedTy->getScalarSizeInBits()));
     auto *ExtendedSumOfShAmts = ConstantExpr::getZExt(SumOfShAmts, ExtendedTy);
     // And compute the mask as usual: ~(-1 << (SumOfShAmts))
     auto *ExtendedAllOnes = ConstantExpr::getAllOnesValue(ExtendedTy);
     auto *ExtendedInvertedMask =
         ConstantExpr::getShl(ExtendedAllOnes, ExtendedSumOfShAmts);
     NewMask = ConstantExpr::getNot(ExtendedInvertedMask);
   } else if (match(Masked, m_c_And(m_CombineOr(MaskC, MaskD), m_Value(X))) ||
              match(Masked, m_Shr(m_Shl(m_Value(X), m_Value(MaskShAmt)),
                                  m_Deferred(MaskShAmt)))) {
+    match(MaskShAmt, m_ZExtOrSelf(m_Value(MaskShAmt)));
+
+    // We have two shift amounts from two different shifts. The types of those
+    // shift amounts may not match. If that's the case let's bailout now.
+    if (MaskShAmt->getType() != ShiftShAmt->getType())
+      return nullptr;
+
     // Can we simplify (ShiftShAmt-MaskShAmt) ?
     auto *ShAmtsDiff = dyn_cast_or_null<Constant>(SimplifySubInst(
         ShiftShAmt, MaskShAmt, /*IsNSW=*/false, /*IsNUW=*/false, Q));
     if (!ShAmtsDiff)
       return nullptr; // Did not simplify.
     // In this pattern ShAmtsDiff correlates with the number of high bits that
     // shall be unset in the root value (OuterShift).
 
if (NeedMask) {
     // The old masking instruction must go away.
     if (!Masked->hasOneUse())
       return nullptr;
     // The original "masking" instruction must not have been`ashr`.
     if (match(Masked, m_AShr(m_Value(), m_Value())))
       return nullptr;
   }
 
-  // No 'NUW'/'NSW'! We no longer know that we won't shift-out non-0 bits.
-  auto *NewShift =
-      BinaryOperator::Create(OuterShift->getOpcode(), X, ShiftShAmt);
+  // If we need to apply truncation, let's do it first, since we can.
+  // We have already ensured that the old truncation will go away.
+  if (HadTrunc)
+    X = Builder.CreateTrunc(X, NarrowestTy);
 
+  // No 'NUW'/'NSW'! We no longer know that we won't shift-out non-0 bits.
+  // We didn't change the Type of this outermost shift, so we can just do it.
+  auto *NewShift = BinaryOperator::Create(OuterShift->getOpcode(), X,
+                                          OuterShift->getOperand(1));
   if (!NeedMask)
     return NewShift;
 
   Builder.Insert(NewShift);
   return BinaryOperator::Create(Instruction::And, NewShift, NewMask);
 }
 
 Instruction *InstCombiner::commonShiftTransforms(BinaryOperator &I) {

llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-after-truncation-variant-a.ll

 ; CHECK-NEXT:    [[T2:%.*]] = shl i64 1, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = add i64 [[T2]], -1
 ; CHECK-NEXT:    [[T4:%.*]] = sub i32 32, [[NBITS]]
 ; CHECK-NEXT:    call void @use32(i32 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use64(i64 [[T3]])
 ; CHECK-NEXT:    call void @use32(i32 [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and i64 [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc i64 [[T5]] to i32
-; CHECK-NEXT:    [[T7:%.*]] = shl i32 [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X:%.*]] to i32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and i32 [[TMP2]], 2147483647
 ; CHECK-NEXT:    ret i32 [[T7]]
 ;
   %t0 = add i32 %nbits, -1
   %t1 = zext i32 %t0 to i64
   %t2 = shl i64 1, %t1 ; shifting by nbits-1
   %t3 = add i64 %t2, -1
   %t4 = sub i32 32, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, %t1 ; shifting by nbits-1
   %t3 = add <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 undef, i64 1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 undef, i64 1>, %t1 ; shifting by nbits-1
   %t3 = add <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 undef, i32 0, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 -1>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -33, i32 -32, i32 -31, i32 -1, i32 0, i32 1, i32 31, i32 32>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, %t1 ; shifting by nbits-1
   %t3 = add <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
 

llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-after-truncation-variant-b.ll

 ; CHECK-NEXT:    [[T2:%.*]] = shl i64 -1, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = xor i64 [[T2]], -1
 ; CHECK-NEXT:    [[T4:%.*]] = sub i32 32, [[NBITS]]
 ; CHECK-NEXT:    call void @use32(i32 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use64(i64 [[T3]])
 ; CHECK-NEXT:    call void @use32(i32 [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and i64 [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc i64 [[T5]] to i32
-; CHECK-NEXT:    [[T7:%.*]] = shl i32 [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X:%.*]] to i32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and i32 [[TMP2]], 2147483647
 ; CHECK-NEXT:    ret i32 [[T7]]
 ;
   %t0 = add i32 %nbits, -1
   %t1 = zext i32 %t0 to i64
   %t2 = shl i64 -1, %t1 ; shifting by nbits-1
   %t3 = xor i64 %t2, -1
   %t4 = sub i32 32, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = xor <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t1 ; shifting by nbits-1
   %t3 = xor <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = xor <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 -1, i32 undef, i32 -1>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t1 ; shifting by nbits-1
   %t3 = xor <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits
 

 ; CHECK-NEXT:    [[T2:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T1]]
 ; CHECK-NEXT:    [[T3:%.*]] = xor <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
+; CHECK-NEXT:    [[T7:%.*]] = and <8 x i32> [[TMP2]], <i32 undef, i32 0, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 -1>
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -33, i32 -32, i32 -31, i32 -1, i32 0, i32 1, i32 31, i32 32>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t1 ; shifting by nbits-1
   %t3 = xor <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t4 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
 

llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-after-truncation-variant-c.ll

 define i32 @t0_basic(i64 %x, i32 %nbits) {
 ; CHECK-LABEL: @t0_basic(
 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = lshr i64 -1, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add i32 [[NBITS]], -33
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use32(i32 [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = and i64 [[T1]], [[X:%.*]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc i64 [[T3]] to i32
-; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X:%.*]] to i32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and i32 [[TMP2]], 2147483647
 ; CHECK-NEXT:    ret i32 [[T5]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = lshr i64 -1, %t0
   %t2 = add i32 %nbits, -33
 
   call void @use64(i64 %t0)
   call void @use64(i64 %t1)

 define <8 x i32> @t1_vec_splat(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t1_vec_splat(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)
   call void @use8xi32(<8 x i32> %t2)
 
   %t3 = and <8 x i64> %t1, %x
   %t4 = trunc <8 x i64> %t3 to <8 x i32>
   %t5 = shl <8 x i32> %t4, %t2 ; shift is smaller than mask
   ret <8 x i32> %t5
 }
 
 define <8 x i32> @t2_vec_splat_undef(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t2_vec_splat_undef(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)
   call void @use8xi32(<8 x i32> %t2)
 
   %t3 = and <8 x i64> %t1, %x
   %t4 = trunc <8 x i64> %t3 to <8 x i32>
   %t5 = shl <8 x i32> %t4, %t2 ; shift is smaller than mask
   ret <8 x i32> %t5
 }
 
 define <8 x i32> @t3_vec_nonsplat(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t3_vec_nonsplat(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 undef, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 undef, i32 undef>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)

llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-after-truncation-variant-d.ll

 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = shl i64 -1, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = lshr i64 [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add i32 [[NBITS]], -33
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use32(i32 [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = and i64 [[T2]], [[X:%.*]]
-; CHECK-NEXT:    [[T5:%.*]] = trunc i64 [[T4]] to i32
-; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X:%.*]] to i32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 [[TMP1]], [[T3]]
+; CHECK-NEXT:    [[T6:%.*]] = and i32 [[TMP2]], 2147483647
 ; CHECK-NEXT:    ret i32 [[T6]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 -1, %t0
   %t2 = lshr i64 %t1, %t0
   %t3 = add i32 %nbits, -33
 
   call void @use64(i64 %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
+; CHECK-NEXT:    [[T6:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
+; CHECK-NEXT:    [[T6:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X:%.*]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
+; CHECK-NEXT:    [[T6:%.*]] = and <8 x i32> [[TMP2]], <i32 undef, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 undef, i32 undef>
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 
   call void @use8xi64(<8 x i64> %t0)

llvm/test/Transforms/InstCombine/partally-redundant-left-shift-input-masking-after-truncation-variant-e.ll

 define i32 @t0_basic(i64 %x, i32 %nbits) {
 ; CHECK-LABEL: @t0_basic(
 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = shl i64 [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add i32 [[NBITS]], -33
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use32(i32 [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = lshr i64 [[T1]], [[T0]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc i64 [[T3]] to i32
-; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[TMP2:%.*]] = shl i32 [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and i32 [[TMP2]], 2147483647
 ; CHECK-NEXT:    ret i32 [[T5]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 %x, %t0
   %t2 = add i32 %nbits, -33
 
   call void @use64(i64 %t0)
   call void @use64(i64 %t1)

 define <8 x i32> @t1_vec_splat(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t1_vec_splat(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)
   call void @use8xi32(<8 x i32> %t2)
 
   %t3 = lshr <8 x i64> %t1, %t0
   %t4 = trunc <8 x i64> %t3 to <8 x i32>
   %t5 = shl <8 x i32> %t4, %t2 ; shift is smaller than mask
   ret <8 x i32> %t5
 }
 
 define <8 x i32> @t2_vec_splat_undef(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t2_vec_splat_undef(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 2147483647, i32 undef, i32 2147483647>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 -33, i32 undef, i32 -33>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)
   call void @use8xi32(<8 x i32> %t2)
 
   %t3 = lshr <8 x i64> %t1, %t0
   %t4 = trunc <8 x i64> %t3 to <8 x i32>
   %t5 = shl <8 x i32> %t4, %t2 ; shift is smaller than mask
   ret <8 x i32> %t5
 }
 
 define <8 x i32> @t3_vec_nonsplat(<8 x i64> %x, <8 x i32> %nbits) {
 ; CHECK-LABEL: @t3_vec_nonsplat(
 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
-; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[TMP2:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
+; CHECK-NEXT:    [[T5:%.*]] = and <8 x i32> [[TMP2]], <i32 undef, i32 1, i32 2147483647, i32 -1, i32 -1, i32 -1, i32 undef, i32 undef>
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -64, i32 -63, i32 -33, i32 -32, i32 63, i32 64, i32 undef, i32 65>
 
   call void @use8xi64(<8 x i64> %t0)
   call void @use8xi64(<8 x i64> %t1)

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-a.ll

 ; CHECK-NEXT:    [[T3:%.*]] = sub i32 32, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and i64 [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use32(i32 [[NBITS]])
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use32(i32 [[T3]])
 ; CHECK-NEXT:    call void @use64(i64 [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc i64 [[T4]] to i32
-; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret i32 [[T6]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 1, %t0
   %t2 = add i64 %t1, -1
   %t3 = sub i32 32, %nbits
   %t4 = and i64 %t2, %x
 

 ; CHECK-NEXT:    [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[NBITS]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, %t0
   %t2 = add <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[NBITS]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 undef, i64 1>, %t0
   %t2 = add <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
   %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[NBITS]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1>, %t0
   %t2 = add <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
   %t4 = and <8 x i64> %t2, %x
 

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-b.ll

 ; CHECK-NEXT:    [[T3:%.*]] = sub i32 32, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and i64 [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use32(i32 [[NBITS]])
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use32(i32 [[T3]])
 ; CHECK-NEXT:    call void @use64(i64 [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc i64 [[T4]] to i32
-; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret i32 [[T6]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 -1, %t0
   %t2 = xor i64 %t1, -1
   %t3 = sub i32 32, %nbits
   %t4 = and i64 %t2, %x
 

 ; CHECK-NEXT:    [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[NBITS]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0
   %t2 = xor <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[NBITS]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = xor <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>
   %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T4:%.*]] = sub <8 x i32> <i32 33, i32 32, i32 33, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]]
 ; CHECK-NEXT:    [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T4]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T5]])
-; CHECK-NEXT:    [[T6:%.*]] = trunc <8 x i64> [[T5]] to <8 x i32>
-; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[T6]], [[T4]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T7:%.*]] = shl <8 x i32> [[TMP1]], [[T4]]
 ; CHECK-NEXT:    ret <8 x i32> [[T7]]
 ;
   %t0 = add <8 x i32> %nbits, <i32 -1, i32 0, i32 0, i32 1, i32 0, i32 0, i32 0, i32 0>
   %t1 = zext <8 x i32> %t0 to <8 x i64>
   %t2 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t1 ; shifting by nbits-1
   %t3 = xor <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>
   %t4 = sub <8 x i32> <i32 33, i32 32, i32 33, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits
   %t5 = and <8 x i64> %t3, %x

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-c.ll

 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = lshr i64 -1, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add i32 [[NBITS]], -32
 ; CHECK-NEXT:    [[T3:%.*]] = and i64 [[T1]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use32(i32 [[T2]])
 ; CHECK-NEXT:    call void @use64(i64 [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc i64 [[T3]] to i32
-; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret i32 [[T5]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = lshr i64 -1, %t0
   %t2 = add i32 %nbits, -32
   %t3 = and i64 %t1, %x
 
   call void @use64(i64 %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
   %t3 = and <8 x i64> %t1, %x
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
   %t3 = and <8 x i64> %t1, %x
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
 ; CHECK-NEXT:    [[T3:%.*]] = and <8 x i64> [[T1]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = lshr <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
   %t3 = and <8 x i64> %t1, %x
 
   call void @use8xi64(<8 x i64> %t0)

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-d.ll

 ; CHECK-NEXT:    [[T2:%.*]] = lshr i64 [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add i32 [[NBITS]], -32
 ; CHECK-NEXT:    [[T4:%.*]] = and i64 [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use64(i64 [[T2]])
 ; CHECK-NEXT:    call void @use32(i32 [[T3]])
 ; CHECK-NEXT:    call void @use64(i64 [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc i64 [[T4]] to i32
-; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T6:%.*]] = shl i32 [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret i32 [[T6]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 -1, %t0
   %t2 = lshr i64 %t1, %t0
   %t3 = add i32 %nbits, -32
   %t4 = and i64 %t2, %x
 

 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
   %t4 = and <8 x i64> %t2, %x
 

 ; CHECK-NEXT:    [[T2:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    [[T3:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
 ; CHECK-NEXT:    [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T2]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T3]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T4]])
-; CHECK-NEXT:    [[T5:%.*]] = trunc <8 x i64> [[T4]] to <8 x i32>
-; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[T5]], [[T3]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]]
 ; CHECK-NEXT:    ret <8 x i32> [[T6]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0
   %t2 = lshr <8 x i64> %t1, %t0
   %t3 = add <8 x i32> %nbits, <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
   %t4 = and <8 x i64> %t2, %x
 

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-e.ll

 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = shl i64 [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add i32 [[NBITS]], -32
 ; CHECK-NEXT:    [[T3:%.*]] = lshr i64 [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use32(i32 [[T2]])
 ; CHECK-NEXT:    call void @use64(i64 [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc i64 [[T3]] to i32
-; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret i32 [[T5]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 %x, %t0
   %t2 = add i32 %nbits, -32
   %t3 = lshr i64 %t1, %t0
 
   call void @use64(i64 %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
   %t3 = lshr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
   %t3 = lshr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
 ; CHECK-NEXT:    [[T3:%.*]] = lshr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
   %t3 = lshr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)

llvm/test/Transforms/InstCombine/redundant-left-shift-input-masking-after-truncation-variant-f.ll

 ; CHECK-NEXT:    [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64
 ; CHECK-NEXT:    [[T1:%.*]] = shl i64 [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add i32 [[NBITS]], -32
 ; CHECK-NEXT:    [[T3:%.*]] = ashr i64 [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use64(i64 [[T0]])
 ; CHECK-NEXT:    call void @use64(i64 [[T1]])
 ; CHECK-NEXT:    call void @use32(i32 [[T2]])
 ; CHECK-NEXT:    call void @use64(i64 [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc i64 [[T3]] to i32
-; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[X]] to i32
+; CHECK-NEXT:    [[T5:%.*]] = shl i32 [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret i32 [[T5]]
 ;
   %t0 = zext i32 %nbits to i64
   %t1 = shl i64 %x, %t0
   %t2 = add i32 %nbits, -32
   %t3 = ashr i64 %t1, %t0
 
   call void @use64(i64 %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = ashr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32>
   %t3 = ashr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
 ; CHECK-NEXT:    [[T3:%.*]] = ashr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 -32, i32 undef, i32 -32>
   %t3 = ashr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)

 ; CHECK-NEXT:    [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64>
 ; CHECK-NEXT:    [[T1:%.*]] = shl <8 x i64> [[X:%.*]], [[T0]]
 ; CHECK-NEXT:    [[T2:%.*]] = add <8 x i32> [[NBITS]], <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
 ; CHECK-NEXT:    [[T3:%.*]] = ashr <8 x i64> [[T1]], [[T0]]
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T0]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T1]])
 ; CHECK-NEXT:    call void @use8xi32(<8 x i32> [[T2]])
 ; CHECK-NEXT:    call void @use8xi64(<8 x i64> [[T3]])
-; CHECK-NEXT:    [[T4:%.*]] = trunc <8 x i64> [[T3]] to <8 x i32>
-; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[T4]], [[T2]]
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32>
+; CHECK-NEXT:    [[T5:%.*]] = shl <8 x i32> [[TMP1]], [[T2]]
 ; CHECK-NEXT:    ret <8 x i32> [[T5]]
 ;
   %t0 = zext <8 x i32> %nbits to <8 x i64>
   %t1 = shl <8 x i64> %x, %t0
   %t2 = add <8 x i32> %nbits, <i32 -32, i32 -1, i32 0, i32 1, i32 31, i32 32, i32 undef, i32 64>
   %t3 = ashr <8 x i64> %t1, %t0
 
   call void @use8xi64(<8 x i64> %t0)