[llvm] r314561 - Eliminate PHI (int typed) which has only one use by intptr
Xinliang David Li via llvm-commits
llvm-commits at lists.llvm.org
Fri Sep 29 15:10:15 PDT 2017
Author: davidxl
Date: Fri Sep 29 15:10:15 2017
New Revision: 314561
URL: http://llvm.org/viewvc/llvm-project?rev=314561&view=rev
Log:
Eliminate PHI (int typed) which has only one use by intptr
This patch will eliminate redundant intptr/ptrtoint that pessimizes
analyses such as SCEV, AA and will make optimization passes such
as auto-vectorization more powerful.
Differential revision: http://reviews.llvm.org/D37832
Added:
llvm/trunk/test/Transforms/InstCombine/intptr1.ll
llvm/trunk/test/Transforms/InstCombine/intptr2.ll
llvm/trunk/test/Transforms/InstCombine/intptr3.ll
llvm/trunk/test/Transforms/InstCombine/intptr4.ll
Modified:
llvm/trunk/lib/Transforms/InstCombine/InstCombineInternal.h
llvm/trunk/lib/Transforms/InstCombine/InstCombinePHI.cpp
Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineInternal.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineInternal.h?rev=314561&r1=314560&r2=314561&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineInternal.h (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineInternal.h Fri Sep 29 15:10:15 2017
@@ -670,6 +670,10 @@ private:
Instruction *FoldPHIArgGEPIntoPHI(PHINode &PN);
Instruction *FoldPHIArgLoadIntoPHI(PHINode &PN);
Instruction *FoldPHIArgZextsIntoPHI(PHINode &PN);
+ /// If an integer typed PHI has only one use which is an IntToPtr operation,
+ /// replace the PHI with an existing pointer typed PHI if it exists. Otherwise
+ /// insert a new pointer typed PHI and replace the original one.
+ Instruction *FoldIntegerTypedPHI(PHINode &PN);
/// Helper function for FoldPHIArgXIntoPHI() to get debug location for the
/// folded operation.
Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombinePHI.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombinePHI.cpp?rev=314561&r1=314560&r2=314561&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombinePHI.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombinePHI.cpp Fri Sep 29 15:10:15 2017
@@ -39,6 +39,222 @@ DebugLoc InstCombiner::PHIArgMergedDebug
return Loc;
}
+// Replace Integer typed PHI PN if the PHI's value is used as a pointer value.
+// If there is an existing pointer typed PHI that produces the same value as PN,
+// replace PN and the IntToPtr operation with it. Otherwise, synthesize a new
+// PHI node:
+//
+// Case-1:
+// bb1:
+// int_init = PtrToInt(ptr_init)
+// br label %bb2
+// bb2:
+// int_val = PHI([int_init, %bb1], [int_val_inc, %bb2]
+// ptr_val = PHI([ptr_init, %bb1], [ptr_val_inc, %bb2]
+// ptr_val2 = IntToPtr(int_val)
+// ...
+// use(ptr_val2)
+// ptr_val_inc = ...
+// inc_val_inc = PtrToInt(ptr_val_inc)
+//
+// ==>
+// bb1:
+// br label %bb2
+// bb2:
+// ptr_val = PHI([ptr_init, %bb1], [ptr_val_inc, %bb2]
+// ...
+// use(ptr_val)
+// ptr_val_inc = ...
+//
+// Case-2:
+// bb1:
+// int_ptr = BitCast(ptr_ptr)
+// int_init = Load(int_ptr)
+// br label %bb2
+// bb2:
+// int_val = PHI([int_init, %bb1], [int_val_inc, %bb2]
+// ptr_val2 = IntToPtr(int_val)
+// ...
+// use(ptr_val2)
+// ptr_val_inc = ...
+// inc_val_inc = PtrToInt(ptr_val_inc)
+// ==>
+// bb1:
+// ptr_init = Load(ptr_ptr)
+// br label %bb2
+// bb2:
+// ptr_val = PHI([ptr_init, %bb1], [ptr_val_inc, %bb2]
+// ...
+// use(ptr_val)
+// ptr_val_inc = ...
+// ...
+//
+Instruction *InstCombiner::FoldIntegerTypedPHI(PHINode &PN) {
+ if (!PN.getType()->isIntegerTy())
+ return nullptr;
+ if (!PN.hasOneUse())
+ return nullptr;
+
+ auto *IntToPtr = dyn_cast<IntToPtrInst>(PN.user_back());
+ if (!IntToPtr)
+ return nullptr;
+
+ // Check if the pointer is actually used as pointer:
+ auto HasPointerUse = [](Instruction *IIP) {
+ for (User *U : IIP->users()) {
+ Value *Ptr = nullptr;
+ if (LoadInst *LoadI = dyn_cast<LoadInst>(U)) {
+ Ptr = LoadI->getPointerOperand();
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(U)) {
+ Ptr = SI->getPointerOperand();
+ } else if (GetElementPtrInst *GI = dyn_cast<GetElementPtrInst>(U)) {
+ Ptr = GI->getPointerOperand();
+ }
+
+ if (Ptr && Ptr == IIP)
+ return true;
+ }
+ return false;
+ };
+
+ if (!HasPointerUse(IntToPtr))
+ return nullptr;
+
+ if (DL.getPointerSizeInBits(IntToPtr->getAddressSpace()) !=
+ DL.getTypeSizeInBits(IntToPtr->getOperand(0)->getType()))
+ return nullptr;
+
+ SmallVector<Value *, 4> AvailablePtrVals;
+ for (unsigned i = 0; i != PN.getNumIncomingValues(); ++i) {
+ Value *Arg = PN.getIncomingValue(i);
+
+ // First look backward:
+ if (auto *PI = dyn_cast<PtrToIntInst>(Arg)) {
+ AvailablePtrVals.emplace_back(PI->getOperand(0));
+ continue;
+ }
+
+ // Next look forward:
+ Value *ArgIntToPtr = nullptr;
+ for (User *U : Arg->users()) {
+ if (isa<IntToPtrInst>(U) && U->getType() == IntToPtr->getType() &&
+ (DT.dominates(cast<Instruction>(U), PN.getIncomingBlock(i)) ||
+ cast<Instruction>(U)->getParent() == PN.getIncomingBlock(i))) {
+ ArgIntToPtr = U;
+ break;
+ }
+ }
+
+ if (ArgIntToPtr) {
+ AvailablePtrVals.emplace_back(ArgIntToPtr);
+ continue;
+ }
+
+ // If Arg is defined by a PHI, allow it. This will also create
+ // more opportunities iteratively.
+ if (isa<PHINode>(Arg)) {
+ AvailablePtrVals.emplace_back(Arg);
+ continue;
+ }
+
+ // For a single use integer load:
+ auto *LoadI = dyn_cast<LoadInst>(Arg);
+ if (!LoadI)
+ return nullptr;
+
+ if (!LoadI->hasOneUse())
+ return nullptr;
+
+ // Push the integer typed Load instruction into the available
+ // value set, and fix it up later when the pointer typed PHI
+ // is synthesized.
+ AvailablePtrVals.emplace_back(LoadI);
+ }
+
+ // Now search for a matching PHI
+ auto *BB = PN.getParent();
+ assert(AvailablePtrVals.size() == PN.getNumIncomingValues() &&
+ "Not enough available ptr typed incoming values");
+ PHINode *MatchingPtrPHI = nullptr;
+ for (auto II = BB->begin(), EI = BasicBlock::iterator(BB->getFirstNonPHI());
+ II != EI; II++) {
+ PHINode *PtrPHI = dyn_cast<PHINode>(II);
+ if (!PtrPHI || PtrPHI == &PN)
+ continue;
+ MatchingPtrPHI = PtrPHI;
+ for (unsigned i = 0; i != PtrPHI->getNumIncomingValues(); ++i) {
+ if (AvailablePtrVals[i] != PtrPHI->getIncomingValue(i)) {
+ MatchingPtrPHI = nullptr;
+ break;
+ }
+ }
+
+ if (MatchingPtrPHI)
+ break;
+ }
+
+ if (MatchingPtrPHI) {
+ assert(MatchingPtrPHI->getType() == IntToPtr->getType() &&
+ "Phi's Type does not match with IntToPtr");
+ // The PtrToCast + IntToPtr will be simplified later
+ return CastInst::CreateBitOrPointerCast(MatchingPtrPHI,
+ IntToPtr->getOperand(0)->getType());
+ }
+
+ // If it requires a conversion for every PHI operand, do not do it.
+ if (std::all_of(AvailablePtrVals.begin(), AvailablePtrVals.end(),
+ [&](Value *V) {
+ return (V->getType() != IntToPtr->getType()) ||
+ isa<IntToPtrInst>(V);
+ }))
+ return nullptr;
+
+ PHINode *NewPtrPHI = PHINode::Create(
+ IntToPtr->getType(), PN.getNumIncomingValues(), PN.getName() + ".ptr");
+
+ InsertNewInstBefore(NewPtrPHI, PN);
+ for (unsigned i = 0; i != PN.getNumIncomingValues(); ++i) {
+ auto *IncomingBB = PN.getIncomingBlock(i);
+ auto *IncomingVal = AvailablePtrVals[i];
+
+ if (IncomingVal->getType() == IntToPtr->getType()) {
+ NewPtrPHI->addIncoming(IncomingVal, IncomingBB);
+ continue;
+ }
+
+#ifndef NDEBUG
+ LoadInst *LoadI = dyn_cast<LoadInst>(IncomingVal);
+ assert((isa<PHINode>(IncomingVal) || (LoadI && LoadI->hasOneUse())) &&
+ "Can not replace LoadInst with multiple uses");
+#endif
+ // Need to insert a BitCast.
+ // For an integer Load instruction with a single use, the load + IntToPtr
+ // cast will be simplified into a pointer load:
+ // %v = load i64, i64* %a.ip, align 8
+ // %v.cast = inttoptr i64 %v to float **
+ // ==>
+ // %v.ptrp = bitcast i64 * %a.ip to float **
+ // %v.cast = load float *, float ** %v.ptrp, align 8
+ auto *CI = CastInst::CreateBitOrPointerCast(
+ IncomingVal, IntToPtr->getType(), IncomingVal->getName() + ".ptr");
+ if (auto *IncomingI = dyn_cast<Instruction>(IncomingVal)) {
+ BasicBlock::iterator InsertPos(IncomingI);
+ InsertPos++;
+ if (isa<PHINode>(IncomingI))
+ InsertPos = IncomingI->getParent()->getFirstInsertionPt();
+ InsertNewInstBefore(CI, *InsertPos);
+ } else {
+ auto *InsertBB = &IncomingBB->getParent()->getEntryBlock();
+ InsertNewInstBefore(CI, *InsertBB->getFirstInsertionPt());
+ }
+ NewPtrPHI->addIncoming(CI, IncomingBB);
+ }
+
+ // The PtrToCast + IntToPtr will be simplified later
+ return CastInst::CreateBitOrPointerCast(NewPtrPHI,
+ IntToPtr->getOperand(0)->getType());
+}
+
/// If we have something like phi [add (a,b), add(a,c)] and if a/b/c and the
/// adds all have a single use, turn this into a phi and a single binop.
Instruction *InstCombiner::FoldPHIArgBinOpIntoPHI(PHINode &PN) {
@@ -902,6 +1118,9 @@ Instruction *InstCombiner::visitPHINode(
// this PHI only has a single use (a PHI), and if that PHI only has one use (a
// PHI)... break the cycle.
if (PN.hasOneUse()) {
+ if (Instruction *Result = FoldIntegerTypedPHI(PN))
+ return Result;
+
Instruction *PHIUser = cast<Instruction>(PN.user_back());
if (PHINode *PU = dyn_cast<PHINode>(PHIUser)) {
SmallPtrSet<PHINode*, 16> PotentiallyDeadPHIs;
Added: llvm/trunk/test/Transforms/InstCombine/intptr1.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/intptr1.ll?rev=314561&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/intptr1.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/intptr1.ll Fri Sep 29 15:10:15 2017
@@ -0,0 +1,181 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+
+define void @test1(float* %a, float* readnone %a_end, i64* %b.i64) {
+; CHECK-LABEL: @test1
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b = load i64, i64* %b.i64, align 8
+; CHECK: load float*, float**
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %for.body ], [ %b, %for.body.preheader ]
+
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK: %b.addr.02.ptr = phi float* [ %add, %for.body ],
+; CHECK-NOT: %b.addr.02 = phi i64
+
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK-NOT: inttoptr i64
+ %tmp1 = load float, float* %tmp, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %tmp, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK-NOT: ptrtoint float*
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+define void @test1_neg(float* %a, float* readnone %a_end, i64* %b.i64) {
+; CHECK-LABEL: @test1_neg
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b = load i64, i64* %b.i64, align 8
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %bb ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %bb ], [ %b, %for.body.preheader ]
+
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %bb ], [ %a, %for.body.preheader ]
+; CHECK: %b.addr.02 = phi i64
+
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK: inttoptr i64
+ %ptrcmp = icmp ult float* %tmp, %a_end
+ br i1 %ptrcmp, label %for.end, label %bb
+
+bb:
+ %tmp1 = load float, float* %a, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %a, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK: ptrtoint float*
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+define void @test2(float* %a, float* readnone %a_end, float** %b.float) {
+; CHECK-LABEL: @test2
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b.i64 = bitcast float** %b.float to i64*
+ %b = load i64, i64* %b.i64, align 8
+; CHECK: load float*, float**
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %for.body ], [ %b, %for.body.preheader ]
+
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK: %b.addr.02.ptr = phi float* [ %add, %for.body ],
+; CHECK-NOT: %b.addr.02 = phi i64
+
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK-NOT: inttoptr i64
+ %tmp1 = load float, float* %tmp, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %tmp, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK-NOT: ptrtoint float*
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+define void @test3(float* %a, float* readnone %a_end, i8** %b.i8p) {
+; CHECK-LABEL: @test3
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b.i64 = bitcast i8** %b.i8p to i64*
+ %b = load i64, i64* %b.i64, align 8
+; CHECK: load float*, float**
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %for.body ], [ %b, %for.body.preheader ]
+
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK: %b.addr.02.ptr = phi float* [ %add, %for.body ],
+; CHECK-NOT: %b.addr.02 = phi i64
+
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK-NOT: inttoptr i64
+ %tmp1 = load float, float* %tmp, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %tmp, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK-NOT: ptrtoint float*
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+define void @test4(float* %a, float* readnone %a_end, float** %b.float) {
+entry:
+; CHECK-LABEL: @test4
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b.f = load float*, float** %b.float, align 8
+ %b = ptrtoint float* %b.f to i64
+; CHECK: load float*, float**
+; CHECK-NOT: ptrtoint float*
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %for.body ], [ %b, %for.body.preheader ]
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK-NOT: inttoptr i64
+ %tmp1 = load float, float* %tmp, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %tmp, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK-NOT: ptrtoint float*
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
Added: llvm/trunk/test/Transforms/InstCombine/intptr2.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/intptr2.ll?rev=314561&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/intptr2.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/intptr2.ll Fri Sep 29 15:10:15 2017
@@ -0,0 +1,37 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+define void @test1(float* %a, float* readnone %a_end, i32* %b.i) {
+; CHECK-LABEL: @test1
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b = ptrtoint i32 * %b.i to i64
+; CHECK: bitcast
+; CHECK-NOT: ptrtoint
+ br label %for.body
+
+for.body: ; preds = %for.body, %for.body.preheader
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.02 = phi i64 [ %add.int, %for.body ], [ %b, %for.body.preheader ]
+
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK-NOT: phi i64
+
+ %tmp = inttoptr i64 %b.addr.02 to float*
+; CHECK-NOT: inttoptr
+ %tmp1 = load float, float* %tmp, align 4
+ %mul.i = fmul float %tmp1, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %add = getelementptr inbounds float, float* %tmp, i64 1
+ %add.int = ptrtoint float* %add to i64
+; CHECK-NOT: ptrtoint
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
Added: llvm/trunk/test/Transforms/InstCombine/intptr3.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/intptr3.ll?rev=314561&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/intptr3.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/intptr3.ll Fri Sep 29 15:10:15 2017
@@ -0,0 +1,37 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+
+define void @test(float* %a, float* readnone %a_end, i64 %b) unnamed_addr {
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ br i1 %cmp1, label %for.body.preheader, label %for.end
+
+for.body.preheader: ; preds = %entry
+ %b.float = inttoptr i64 %b to float*
+ br label %for.body
+
+for.body: ; preds = %for.body.preheader, %for.body
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+ %b.addr.i64 = phi i64 [ %b.addr.i64.inc, %for.body ], [ %b, %for.body.preheader ]
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK-NEXT: %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+; CHECK-NEXT: = load float
+ %l = load float, float* %b.addr.float, align 4
+ %mul.i = fmul float %l, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %b.addr.float.2 = inttoptr i64 %b.addr.i64 to float*
+; CHECK-NOT: inttoptr
+ %b.addr.float.inc = getelementptr inbounds float, float* %b.addr.float.2, i64 1
+ %b.addr.i64.inc = ptrtoint float* %b.addr.float.inc to i64
+; CHECK-NOT: ptrtoint
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+
Added: llvm/trunk/test/Transforms/InstCombine/intptr4.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/intptr4.ll?rev=314561&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/intptr4.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/intptr4.ll Fri Sep 29 15:10:15 2017
@@ -0,0 +1,47 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+
+define void @test(float* %a, float* readnone %a_end, i64 %b, float* %bf) unnamed_addr {
+entry:
+ %cmp1 = icmp ult float* %a, %a_end
+ %b.float = inttoptr i64 %b to float*
+ br i1 %cmp1, label %bb1, label %bb2
+
+bb1:
+ br label %for.body.preheader
+bb2:
+ %bfi = ptrtoint float* %bf to i64
+ br label %for.body.preheader
+
+for.body.preheader: ; preds = %entry
+ %b.phi = phi i64 [%b, %bb1], [%bfi, %bb2]
+; CHECK-LABEL: for.body.preheader
+; CHECK-NOT: %b.phi = phi i64
+ br label %for.body
+
+for.body: ; preds = %for.body.preheader, %for.body
+; CHECK-LABEL: for.body
+ %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+ %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+ %b.addr.i64 = phi i64 [ %b.addr.i64.inc, %for.body ], [ %b.phi, %for.body.preheader ]
+; CHECK: %a.addr.03 = phi float* [ %incdec.ptr, %for.body ], [ %a, %for.body.preheader ]
+; CHECK-NEXT: %b.addr.float = phi float* [ %b.addr.float.inc, %for.body ], [ %b.float, %for.body.preheader ]
+; CHECK-NOT: = %b.addr.i64
+ %l = load float, float* %b.addr.float, align 4
+ %mul.i = fmul float %l, 4.200000e+01
+ store float %mul.i, float* %a.addr.03, align 4
+ %b.addr.float.2 = inttoptr i64 %b.addr.i64 to float*
+; CHECK-NOT: inttoptr
+ %b.addr.float.inc = getelementptr inbounds float, float* %b.addr.float.2, i64 1
+ %b.addr.i64.inc = ptrtoint float* %b.addr.float.inc to i64
+; CHECK-NOT: ptrtoint
+ %incdec.ptr = getelementptr inbounds float, float* %a.addr.03, i64 1
+ %cmp = icmp ult float* %incdec.ptr, %a_end
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.body, %entry
+ ret void
+}
+
+
+
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