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Revert "Reapply [InstCombine] Switch foldOpIntoPhi() to use InstSimplify" 

This reverts commit e94619b955.
This commit is contained in:
Alina Sbirlea 2022-10-06 13:10:41 -07:00
parent 2253b06f55
commit b9898e7ed1
8 changed files with 146 additions and 77 deletions
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171
llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
View File

@ -1155,6 +1155,22 @@ Instruction *InstCombinerImpl::FoldOpIntoSelect(Instruction &Op, SelectInst *SI,
return SelectInst::Create(SI->getCondition(), NewTV, NewFV, "", nullptr, SI);
}
static Value *foldOperationIntoPhiValue(BinaryOperator *I, Value *InV,
InstCombiner::BuilderTy &Builder) {
bool ConstIsRHS = isa<Constant>(I->getOperand(1));
Constant *C = cast<Constant>(I->getOperand(ConstIsRHS));
Value *Op0 = InV, *Op1 = C;
if (!ConstIsRHS)
std::swap(Op0, Op1);
Value *RI = Builder.CreateBinOp(I->getOpcode(), Op0, Op1, "phi.bo");
auto *FPInst = dyn_cast<Instruction>(RI);
if (FPInst && isa<FPMathOperator>(FPInst))
FPInst->copyFastMathFlags(I);
return RI;
}
Instruction *InstCombinerImpl::foldOpIntoPhi(Instruction &I, PHINode *PN) {
unsigned NumPHIValues = PN->getNumIncomingValues();
if (NumPHIValues == 0)
@ -1173,68 +1189,48 @@ Instruction *InstCombinerImpl::foldOpIntoPhi(Instruction &I, PHINode *PN) {
// Otherwise, we can replace *all* users with the new PHI we form.
}
// Check to see whether the instruction can be folded into each phi operand.
// If there is one operand that does not fold, remember the BB it is in.
// If there is more than one or if *it* is a PHI, bail out.
SmallVector<Value *> NewPhiValues;
BasicBlock *NonSimplifiedBB = nullptr;
Value *NonSimplifiedInVal = nullptr;
// Check to see if all of the operands of the PHI are simple constants
// (constantint/constantfp/undef). If there is one non-constant value,
// remember the BB it is in. If there is more than one or if *it* is a PHI,
// bail out. We don't do arbitrary constant expressions here because moving
// their computation can be expensive without a cost model.
BasicBlock *NonConstBB = nullptr;
for (unsigned i = 0; i != NumPHIValues; ++i) {
Value *InVal = PN->getIncomingValue(i);
BasicBlock *InBB = PN->getIncomingBlock(i);
// NB: It is a precondition of this transform that the operands be
// phi translatable! This is usually trivially satisfied by limiting it
// to constant ops, and for selects we do a more sophisticated check.
SmallVector<Value *> Ops;
for (Value *Op : I.operands()) {
if (Op == PN)
Ops.push_back(InVal);
else
Ops.push_back(Op->DoPHITranslation(PN->getParent(), InBB));
}
// Don't consider the simplification successful if we get back a constant
// expression. That's just an instruction in hiding.
// Also reject the case where we simplify back to the phi node. We wouldn't
// be able to remove it in that case.
Value *NewVal = simplifyInstructionWithOperands(&I, Ops, SQ);
if (NewVal && NewVal != PN && !match(NewVal, m_ConstantExpr())) {
NewPhiValues.push_back(NewVal);
// For non-freeze, require constant operand
// For freeze, require non-undef, non-poison operand
if (!isa<FreezeInst>(I) && match(InVal, m_ImmConstant()))
continue;
if (isa<FreezeInst>(I) && isGuaranteedNotToBeUndefOrPoison(InVal))
continue;
}
if (isa<PHINode>(InVal)) return nullptr; // Itself a phi.
if (NonSimplifiedBB) return nullptr; // More than one non-simplified value.
if (NonConstBB) return nullptr; // More than one non-const value.
NonSimplifiedBB = InBB;
NonSimplifiedInVal = InVal;
NewPhiValues.push_back(nullptr);
NonConstBB = PN->getIncomingBlock(i);
// If the InVal is an invoke at the end of the pred block, then we can't
// insert a computation after it without breaking the edge.
if (isa<InvokeInst>(InVal))
if (cast<Instruction>(InVal)->getParent() == NonSimplifiedBB)
if (cast<Instruction>(InVal)->getParent() == NonConstBB)
return nullptr;
// If the incoming non-constant value is reachable from the phis block,
// we'll push the operation across a loop backedge. This could result in
// an infinite combine loop, and is generally non-profitable (especially
// if the operation was originally outside the loop).
if (isPotentiallyReachable(PN->getParent(), NonSimplifiedBB, nullptr, &DT,
LI))
if (isPotentiallyReachable(PN->getParent(), NonConstBB, nullptr, &DT, LI))
return nullptr;
}
// If there is exactly one non-simplified value, we can insert a copy of the
// If there is exactly one non-constant value, we can insert a copy of the
// operation in that block. However, if this is a critical edge, we would be
// inserting the computation on some other paths (e.g. inside a loop). Only
// do this if the pred block is unconditionally branching into the phi block.
// Also, make sure that the pred block is not dead code.
if (NonSimplifiedBB != nullptr) {
BranchInst *BI = dyn_cast<BranchInst>(NonSimplifiedBB->getTerminator());
if (!BI || !BI->isUnconditional() ||
!DT.isReachableFromEntry(NonSimplifiedBB))
if (NonConstBB != nullptr) {
BranchInst *BI = dyn_cast<BranchInst>(NonConstBB->getTerminator());
if (!BI || !BI->isUnconditional() || !DT.isReachableFromEntry(NonConstBB))
return nullptr;
}
@ -1245,23 +1241,88 @@ Instruction *InstCombinerImpl::foldOpIntoPhi(Instruction &I, PHINode *PN) {
// If we are going to have to insert a new computation, do so right before the
// predecessor's terminator.
Instruction *Clone = nullptr;
if (NonSimplifiedBB) {
Clone = I.clone();
for (Use &U : Clone->operands()) {
if (U == PN)
U = NonSimplifiedInVal;
else
U = U->DoPHITranslation(PN->getParent(), NonSimplifiedBB);
}
InsertNewInstBefore(Clone, *NonSimplifiedBB->getTerminator());
}
if (NonConstBB)
Builder.SetInsertPoint(NonConstBB->getTerminator());
for (unsigned i = 0; i != NumPHIValues; ++i) {
if (NewPhiValues[i])
NewPN->addIncoming(NewPhiValues[i], PN->getIncomingBlock(i));
else
NewPN->addIncoming(Clone, PN->getIncomingBlock(i));
// Next, add all of the operands to the PHI.
if (SelectInst *SI = dyn_cast<SelectInst>(&I)) {
// We only currently try to fold the condition of a select when it is a phi,
// not the true/false values.
Value *TrueV = SI->getTrueValue();
Value *FalseV = SI->getFalseValue();
BasicBlock *PhiTransBB = PN->getParent();
for (unsigned i = 0; i != NumPHIValues; ++i) {
BasicBlock *ThisBB = PN->getIncomingBlock(i);
Value *TrueVInPred = TrueV->DoPHITranslation(PhiTransBB, ThisBB);
Value *FalseVInPred = FalseV->DoPHITranslation(PhiTransBB, ThisBB);
Value *InV = nullptr;
// Beware of ConstantExpr: it may eventually evaluate to getNullValue,
// even if currently isNullValue gives false.
Constant *InC = dyn_cast<Constant>(PN->getIncomingValue(i));
// For vector constants, we cannot use isNullValue to fold into
// FalseVInPred versus TrueVInPred. When we have individual nonzero
// elements in the vector, we will incorrectly fold InC to
// `TrueVInPred`.
if (InC && isa<ConstantInt>(InC))
InV = InC->isNullValue() ? FalseVInPred : TrueVInPred;
else {
// Generate the select in the same block as PN's current incoming block.
// Note: ThisBB need not be the NonConstBB because vector constants
// which are constants by definition are handled here.
// FIXME: This can lead to an increase in IR generation because we might
// generate selects for vector constant phi operand, that could not be
// folded to TrueVInPred or FalseVInPred as done for ConstantInt. For
// non-vector phis, this transformation was always profitable because
// the select would be generated exactly once in the NonConstBB.
Builder.SetInsertPoint(ThisBB->getTerminator());
InV = Builder.CreateSelect(PN->getIncomingValue(i), TrueVInPred,
FalseVInPred, "phi.sel");
}
NewPN->addIncoming(InV, ThisBB);
}
} else if (CmpInst *CI = dyn_cast<CmpInst>(&I)) {
Constant *C = cast<Constant>(I.getOperand(1));
for (unsigned i = 0; i != NumPHIValues; ++i) {
Value *InV = nullptr;
if (auto *InC = dyn_cast<Constant>(PN->getIncomingValue(i)))
InV = ConstantExpr::getCompare(CI->getPredicate(), InC, C);
else
InV = Builder.CreateCmp(CI->getPredicate(), PN->getIncomingValue(i),
C, "phi.cmp");
NewPN->addIncoming(InV, PN->getIncomingBlock(i));
}
} else if (auto *BO = dyn_cast<BinaryOperator>(&I)) {
for (unsigned i = 0; i != NumPHIValues; ++i) {
Value *InV = foldOperationIntoPhiValue(BO, PN->getIncomingValue(i),
Builder);
NewPN->addIncoming(InV, PN->getIncomingBlock(i));
}
} else if (isa<FreezeInst>(&I)) {
for (unsigned i = 0; i != NumPHIValues; ++i) {
Value *InV;
if (NonConstBB == PN->getIncomingBlock(i))
InV = Builder.CreateFreeze(PN->getIncomingValue(i), "phi.fr");
else
InV = PN->getIncomingValue(i);
NewPN->addIncoming(InV, PN->getIncomingBlock(i));
}
} else if (auto *EV = dyn_cast<ExtractValueInst>(&I)) {
for (unsigned i = 0; i != NumPHIValues; ++i)
NewPN->addIncoming(Builder.CreateExtractValue(PN->getIncomingValue(i),
EV->getIndices(), "phi.ev"),
PN->getIncomingBlock(i));
} else {
CastInst *CI = cast<CastInst>(&I);
Type *RetTy = CI->getType();
for (unsigned i = 0; i != NumPHIValues; ++i) {
Value *InV;
if (Constant *InC = dyn_cast<Constant>(PN->getIncomingValue(i)))
InV = ConstantExpr::getCast(CI->getOpcode(), InC, RetTy);
else
InV = Builder.CreateCast(CI->getOpcode(), PN->getIncomingValue(i),
I.getType(), "phi.cast");
NewPN->addIncoming(InV, PN->getIncomingBlock(i));
}
}
for (User *U : make_early_inc_range(PN->users())) {

9
llvm/test/Transforms/InstCombine/intptr1.ll
View File

@ -57,18 +57,19 @@ define void @test1_neg(ptr %a, ptr readnone %a_end, ptr %b.i64) {
; CHECK-NEXT: br i1 [[CMP1]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; CHECK: for.body.preheader:
; CHECK-NEXT: [[B:%.*]] = load i64, ptr [[B_I64:%.*]], align 8
; CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[B]] to ptr
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[A_ADDR_03:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[BB:%.*]] ], [ [[A]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_02:%.*]] = phi ptr [ [[ADD:%.*]], [[BB]] ], [ [[TMP0]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[PTRCMP:%.*]] = icmp ult ptr [[B_ADDR_02]], [[A_END]]
; CHECK-NEXT: [[B_ADDR_02:%.*]] = phi i64 [ [[ADD_INT:%.*]], [[BB]] ], [ [[B]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[TMP:%.*]] = inttoptr i64 [[B_ADDR_02]] to ptr
; CHECK-NEXT: [[PTRCMP:%.*]] = icmp ult ptr [[TMP]], [[A_END]]
; CHECK-NEXT: br i1 [[PTRCMP]], label [[FOR_END]], label [[BB]]
; CHECK: bb:
; CHECK-NEXT: [[I1:%.*]] = load float, ptr [[A]], align 4
; CHECK-NEXT: [[MUL_I:%.*]] = fmul float [[I1]], 4.200000e+01
; CHECK-NEXT: store float [[MUL_I]], ptr [[A_ADDR_03]], align 4
; CHECK-NEXT: [[ADD]] = getelementptr inbounds float, ptr [[A]], i64 1
; CHECK-NEXT: [[ADD:%.*]] = getelementptr inbounds float, ptr [[A]], i64 1
; CHECK-NEXT: [[ADD_INT]] = ptrtoint ptr [[ADD]] to i64
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds float, ptr [[A_ADDR_03]], i64 1
; CHECK-NEXT: [[CMP:%.*]] = icmp ult ptr [[INCDEC_PTR]], [[A_END]]
; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END]]

7
llvm/test/Transforms/InstCombine/intptr4.ll
View File

@ -8,17 +8,18 @@ define void @test(ptr %a, ptr readnone %a_end, i64 %b, ptr %bf) unnamed_addr {
; CHECK-NEXT: [[B_FLOAT:%.*]] = inttoptr i64 [[B:%.*]] to ptr
; CHECK-NEXT: br i1 [[CMP1]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[B]] to ptr
; CHECK-NEXT: br label [[FOR_BODY_PREHEADER:%.*]]
; CHECK: bb2:
; CHECK-NEXT: [[BFI:%.*]] = ptrtoint ptr [[BF:%.*]] to i64
; CHECK-NEXT: br label [[FOR_BODY_PREHEADER]]
; CHECK: for.body.preheader:
; CHECK-NEXT: [[B_PHI:%.*]] = phi ptr [ [[TMP0]], [[BB1]] ], [ [[BF:%.*]], [[BB2]] ]
; CHECK-NEXT: [[B_PHI:%.*]] = phi i64 [ [[B]], [[BB1]] ], [ [[BFI]], [[BB2]] ]
; CHECK-NEXT: [[B_PHI_PTR:%.*]] = inttoptr i64 [[B_PHI]] to ptr
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[A_ADDR_03:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[A]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_FLOAT:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC:%.*]], [[FOR_BODY]] ], [ [[B_FLOAT]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_I64_PTR:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC]], [[FOR_BODY]] ], [ [[B_PHI]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_I64_PTR:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC]], [[FOR_BODY]] ], [ [[B_PHI_PTR]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[B_ADDR_FLOAT]], align 4
; CHECK-NEXT: [[MUL_I:%.*]] = fmul float [[L]], 4.200000e+01
; CHECK-NEXT: store float [[MUL_I]], ptr [[A_ADDR_03]], align 4

7
llvm/test/Transforms/InstCombine/intptr5.ll
View File

@ -8,19 +8,20 @@ define void @test(ptr %a, ptr readnone %a_end, i64 %b, ptr %bf) unnamed_addr {
; CHECK-NEXT: [[B_FLOAT:%.*]] = inttoptr i64 [[B:%.*]] to ptr
; CHECK-NEXT: br i1 [[CMP1]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[B]] to ptr
; CHECK-NEXT: br label [[FOR_BODY_PREHEADER:%.*]]
; CHECK: bb2:
; CHECK-NEXT: [[BFI:%.*]] = ptrtoint ptr [[BF:%.*]] to i64
; CHECK-NEXT: br label [[FOR_BODY_PREHEADER]]
; CHECK: for.body.preheader:
; CHECK-NEXT: [[B_PHI:%.*]] = phi ptr [ [[TMP0]], [[BB1]] ], [ [[BF:%.*]], [[BB2]] ]
; CHECK-NEXT: [[B_PHI:%.*]] = phi i64 [ [[B]], [[BB1]] ], [ [[BFI]], [[BB2]] ]
; CHECK-NEXT: [[B_PHI_PTR:%.*]] = inttoptr i64 [[B_PHI]] to ptr
; CHECK-NEXT: switch i64 [[B]], label [[FOR_BODY:%.*]] [
; CHECK-NEXT: i64 1, label [[FOR_BODY]]
; CHECK-NEXT: ]
; CHECK: for.body:
; CHECK-NEXT: [[A_ADDR_03:%.*]] = phi ptr [ [[INCDEC_PTR:%.*]], [[FOR_BODY]] ], [ [[A]], [[FOR_BODY_PREHEADER]] ], [ [[A]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_FLOAT:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC:%.*]], [[FOR_BODY]] ], [ [[B_FLOAT]], [[FOR_BODY_PREHEADER]] ], [ [[B_FLOAT]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_I64_PTR:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC]], [[FOR_BODY]] ], [ [[B_PHI]], [[FOR_BODY_PREHEADER]] ], [ [[B_PHI]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[B_ADDR_I64_PTR:%.*]] = phi ptr [ [[B_ADDR_FLOAT_INC]], [[FOR_BODY]] ], [ [[B_PHI_PTR]], [[FOR_BODY_PREHEADER]] ], [ [[B_PHI_PTR]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT: [[L:%.*]] = load float, ptr [[B_ADDR_FLOAT]], align 4
; CHECK-NEXT: [[MUL_I:%.*]] = fmul float [[L]], 4.200000e+01
; CHECK-NEXT: store float [[MUL_I]], ptr [[A_ADDR_03]], align 4

7
llvm/test/Transforms/InstCombine/intptr7.ll
View File

@ -51,16 +51,17 @@ define void @no_matching_phi(i64 %a, ptr %b, i1 %cond) {
; CHECK-NEXT: [[ADDB:%.*]] = getelementptr inbounds float, ptr [[B:%.*]], i64 2
; CHECK-NEXT: br i1 [[COND:%.*]], label [[B:%.*]], label [[A:%.*]]
; CHECK: A:
; CHECK-NEXT: [[TMP0:%.*]] = inttoptr i64 [[ADD_INT]] to ptr
; CHECK-NEXT: br label [[C:%.*]]
; CHECK: B:
; CHECK-NEXT: [[ADDB_INT:%.*]] = ptrtoint ptr [[ADDB]] to i64
; CHECK-NEXT: [[ADD:%.*]] = inttoptr i64 [[ADD_INT]] to ptr
; CHECK-NEXT: store float 1.000000e+01, ptr [[ADD]], align 4
; CHECK-NEXT: br label [[C]]
; CHECK: C:
; CHECK-NEXT: [[A_ADDR_03:%.*]] = phi ptr [ [[ADDB]], [[A]] ], [ [[ADD]], [[B]] ]
; CHECK-NEXT: [[B_ADDR_02:%.*]] = phi ptr [ [[TMP0]], [[A]] ], [ [[ADDB]], [[B]] ]
; CHECK-NEXT: [[I1:%.*]] = load float, ptr [[B_ADDR_02]], align 4
; CHECK-NEXT: [[B_ADDR_02:%.*]] = phi i64 [ [[ADD_INT]], [[A]] ], [ [[ADDB_INT]], [[B]] ]
; CHECK-NEXT: [[I0:%.*]] = inttoptr i64 [[B_ADDR_02]] to ptr
; CHECK-NEXT: [[I1:%.*]] = load float, ptr [[I0]], align 4
; CHECK-NEXT: [[MUL_I:%.*]] = fmul float [[I1]], 4.200000e+01
; CHECK-NEXT: store float [[MUL_I]], ptr [[A_ADDR_03]], align 4
; CHECK-NEXT: ret void

8
llvm/test/Transforms/InstCombine/phi-select-constant.ll
View File

@ -77,15 +77,17 @@ final:
define <2 x i8> @vec3(i1 %cond1, i1 %cond2, <2 x i1> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @vec3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PHI_SEL1:%.*]] = shufflevector <2 x i8> [[Z:%.*]], <2 x i8> [[Y:%.*]], <2 x i32> <i32 0, i32 3>
; CHECK-NEXT: br i1 [[COND1:%.*]], label [[IF1:%.*]], label [[ELSE:%.*]]
; CHECK: if1:
; CHECK-NEXT: [[PHI_SEL2:%.*]] = shufflevector <2 x i8> [[Y]], <2 x i8> [[Z]], <2 x i32> <i32 0, i32 3>
; CHECK-NEXT: br i1 [[COND2:%.*]], label [[IF2:%.*]], label [[ELSE]]
; CHECK: if2:
; CHECK-NEXT: [[PHI_SEL:%.*]] = select <2 x i1> [[X:%.*]], <2 x i8> [[Y]], <2 x i8> [[Z]]
; CHECK-NEXT: br label [[ELSE]]
; CHECK: else:
; CHECK-NEXT: [[PHI:%.*]] = phi <2 x i1> [ [[X:%.*]], [[IF2]] ], [ <i1 false, i1 true>, [[ENTRY:%.*]] ], [ <i1 true, i1 false>, [[IF1]] ]
; CHECK-NEXT: [[SEL:%.*]] = select <2 x i1> [[PHI]], <2 x i8> [[Y:%.*]], <2 x i8> [[Z:%.*]]
; CHECK-NEXT: ret <2 x i8> [[SEL]]
; CHECK-NEXT: [[PHI:%.*]] = phi <2 x i8> [ [[PHI_SEL]], [[IF2]] ], [ [[PHI_SEL1]], [[ENTRY:%.*]] ], [ [[PHI_SEL2]], [[IF1]] ]
; CHECK-NEXT: ret <2 x i8> [[PHI]]
;
entry:
br i1 %cond1, label %if1, label %else

10
llvm/test/Transforms/InstCombine/phi.ll
View File

@ -697,10 +697,10 @@ ret:
define i32 @test23(i32 %A, i1 %pb, ptr %P) {
; CHECK-LABEL: @test23(
; CHECK-NEXT: BB0:
; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[A:%.*]], 19
; CHECK-NEXT: [[PHI_BO:%.*]] = add i32 [[A:%.*]], 19
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: Loop:
; CHECK-NEXT: [[B:%.*]] = phi i32 [ [[TMP0]], [[BB0:%.*]] ], [ 61, [[LOOP]] ]
; CHECK-NEXT: [[B:%.*]] = phi i32 [ [[PHI_BO]], [[BB0:%.*]] ], [ 61, [[LOOP]] ]
; CHECK-NEXT: store i32 [[B]], ptr [[P:%.*]], align 4
; CHECK-NEXT: br i1 [[PB:%.*]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK: Exit:
@ -1280,12 +1280,14 @@ define i1 @pr57488_icmp_of_phi(ptr %ptr.base, i64 %len) {
; CHECK-NEXT: [[LEN_ZERO:%.*]] = icmp eq i64 [[LEN]], 0
; CHECK-NEXT: br i1 [[LEN_ZERO]], label [[EXIT:%.*]], label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[ACCUM:%.*]] = phi i1 [ [[AND:%.*]], [[LOOP]] ], [ true, [[START:%.*]] ]
; CHECK-NEXT: [[ACCUM:%.*]] = phi i8 [ [[ACCUM_NEXT:%.*]], [[LOOP]] ], [ 1, [[START:%.*]] ]
; CHECK-NEXT: [[PTR:%.*]] = phi ptr [ [[PTR_NEXT:%.*]], [[LOOP]] ], [ [[PTR_BASE]], [[START]] ]
; CHECK-NEXT: [[PTR_NEXT]] = getelementptr inbounds i64, ptr [[PTR]], i64 1
; CHECK-NEXT: [[ACCUM_BOOL:%.*]] = icmp ne i8 [[ACCUM]], 0
; CHECK-NEXT: [[VAL:%.*]] = load i64, ptr [[PTR]], align 8
; CHECK-NEXT: [[VAL_ZERO:%.*]] = icmp eq i64 [[VAL]], 0
; CHECK-NEXT: [[AND]] = and i1 [[ACCUM]], [[VAL_ZERO]]
; CHECK-NEXT: [[AND:%.*]] = and i1 [[ACCUM_BOOL]], [[VAL_ZERO]]
; CHECK-NEXT: [[ACCUM_NEXT]] = zext i1 [[AND]] to i8
; CHECK-NEXT: [[EXIT_COND:%.*]] = icmp eq ptr [[PTR_NEXT]], [[END]]
; CHECK-NEXT: br i1 [[EXIT_COND]], label [[EXIT]], label [[LOOP]]
; CHECK: exit:

4
llvm/test/Transforms/InstCombine/recurrence.ll
View File

@ -4,9 +4,9 @@
define i64 @test_or(i64 %a) {
; CHECK-LABEL: @test_or(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = or i64 [[A:%.*]], 15
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[TMP0:%.*]] = or i64 [[A:%.*]], 15
; CHECK-NEXT: tail call void @use(i64 [[TMP0]])
; CHECK-NEXT: br label [[LOOP]]
;
@ -84,9 +84,9 @@ loop: ; preds = %loop, %entry
define i64 @test_and(i64 %a) {
; CHECK-LABEL: @test_and(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TMP0:%.*]] = and i64 [[A:%.*]], 15
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[TMP0:%.*]] = and i64 [[A:%.*]], 15
; CHECK-NEXT: tail call void @use(i64 [[TMP0]])
; CHECK-NEXT: br label [[LOOP]]
;