[llvm] d01237c - [InstCombine] Make indexed compare fold GEP source type independent (#71663)
via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 28 00:16:09 PST 2023
Author: Nikita Popov
Date: 2023-11-28T09:16:04+01:00
New Revision: d01237c45b7cdbf83d1249dd019178b2cafbb63c
URL: https://github.com/llvm/llvm-project/commit/d01237c45b7cdbf83d1249dd019178b2cafbb63c
DIFF: https://github.com/llvm/llvm-project/commit/d01237c45b7cdbf83d1249dd019178b2cafbb63c.diff
LOG: [InstCombine] Make indexed compare fold GEP source type independent (#71663)
The indexed compare fold converts comparisons of GEPs with same
(indirect) base into comparisons of offset. Currently, it only supports
GEPs with the same source element type.
This change makes the transform operate on offsets instead, which
removes the type dependence. To keep closer to the scope of the original
implementation, this keeps the limitation that we should only have at
most one variable index per GEP.
This addresses the main regression from
https://github.com/llvm/llvm-project/pull/68882.
TBH I have some doubts that this is really a useful transform (at least
for the case where there are extra pointer users, so we have to
rematerialize pointers at some point). I can only assume it exists for a
reason...
Added:
Modified:
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
llvm/test/Transforms/InstCombine/indexed-gep-compares.ll
llvm/test/Transforms/InstCombine/opaque-ptr.ll
Removed:
################################################################################
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
index b6e59f707e78268..69b96445c76e9fb 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -18,6 +18,7 @@
#include "llvm/Analysis/CmpInstAnalysis.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/InstructionSimplify.h"
+#include "llvm/Analysis/Utils/Local.h"
#include "llvm/Analysis/VectorUtils.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/DataLayout.h"
@@ -413,7 +414,7 @@ Instruction *InstCombinerImpl::foldCmpLoadFromIndexedGlobal(
/// Returns true if we can rewrite Start as a GEP with pointer Base
/// and some integer offset. The nodes that need to be re-written
/// for this transformation will be added to Explored.
-static bool canRewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
+static bool canRewriteGEPAsOffset(Value *Start, Value *Base,
const DataLayout &DL,
SetVector<Value *> &Explored) {
SmallVector<Value *, 16> WorkList(1, Start);
@@ -447,11 +448,9 @@ static bool canRewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
return false;
if (auto *GEP = dyn_cast<GEPOperator>(V)) {
- // We're limiting the GEP to having one index. This will preserve
- // the original pointer type. We could handle more cases in the
- // future.
- if (GEP->getNumIndices() != 1 || !GEP->isInBounds() ||
- GEP->getSourceElementType() != ElemTy)
+ // Only allow inbounds GEPs with at most one variable offset.
+ auto IsNonConst = [](Value *V) { return !isa<ConstantInt>(V); };
+ if (!GEP->isInBounds() || count_if(GEP->indices(), IsNonConst) > 1)
return false;
if (!Explored.contains(GEP->getOperand(0)))
@@ -528,7 +527,7 @@ static void setInsertionPoint(IRBuilder<> &Builder, Value *V,
/// Returns a re-written value of Start as an indexed GEP using Base as a
/// pointer.
-static Value *rewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
+static Value *rewriteGEPAsOffset(Value *Start, Value *Base,
const DataLayout &DL,
SetVector<Value *> &Explored,
InstCombiner &IC) {
@@ -559,29 +558,18 @@ static Value *rewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
// Create all the other instructions.
for (Value *Val : Explored) {
-
if (NewInsts.contains(Val))
continue;
if (auto *GEP = dyn_cast<GEPOperator>(Val)) {
- Value *Index = NewInsts[GEP->getOperand(1)] ? NewInsts[GEP->getOperand(1)]
- : GEP->getOperand(1);
setInsertionPoint(Builder, GEP);
- // Indices might need to be sign extended. GEPs will magically do
- // this, but we need to do it ourselves here.
- if (Index->getType()->getScalarSizeInBits() !=
- NewInsts[GEP->getOperand(0)]->getType()->getScalarSizeInBits()) {
- Index = Builder.CreateSExtOrTrunc(
- Index, NewInsts[GEP->getOperand(0)]->getType(),
- GEP->getOperand(0)->getName() + ".sext");
- }
-
- auto *Op = NewInsts[GEP->getOperand(0)];
+ Value *Op = NewInsts[GEP->getOperand(0)];
+ Value *OffsetV = emitGEPOffset(&Builder, DL, GEP);
if (isa<ConstantInt>(Op) && cast<ConstantInt>(Op)->isZero())
- NewInsts[GEP] = Index;
+ NewInsts[GEP] = OffsetV;
else
NewInsts[GEP] = Builder.CreateNSWAdd(
- Op, Index, GEP->getOperand(0)->getName() + ".add");
+ Op, OffsetV, GEP->getOperand(0)->getName() + ".add");
continue;
}
if (isa<PHINode>(Val))
@@ -609,23 +597,14 @@ static Value *rewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
}
}
- PointerType *PtrTy = PointerType::get(
- Base->getContext(), Start->getType()->getPointerAddressSpace());
for (Value *Val : Explored) {
if (Val == Base)
continue;
- // Depending on the type, for external users we have to emit
- // a GEP or a GEP + ptrtoint.
setInsertionPoint(Builder, Val, false);
-
- // Cast base to the expected type.
- Value *NewVal = Builder.CreateBitOrPointerCast(
- Base, PtrTy, Start->getName() + "to.ptr");
- NewVal = Builder.CreateInBoundsGEP(ElemTy, NewVal, ArrayRef(NewInsts[Val]),
- Val->getName() + ".ptr");
- NewVal = Builder.CreateBitOrPointerCast(
- NewVal, Val->getType(), Val->getName() + ".conv");
+ // Create GEP for external users.
+ Value *NewVal = Builder.CreateInBoundsGEP(
+ Builder.getInt8Ty(), Base, NewInsts[Val], Val->getName() + ".ptr");
IC.replaceInstUsesWith(*cast<Instruction>(Val), NewVal);
// Add old instruction to worklist for DCE. We don't directly remove it
// here because the original compare is one of the users.
@@ -635,32 +614,6 @@ static Value *rewriteGEPAsOffset(Type *ElemTy, Value *Start, Value *Base,
return NewInsts[Start];
}
-/// Looks through GEPs in order to express the input Value as a constant
-/// indexed GEP. Returns a pair containing the GEPs Pointer and Index.
-static std::pair<Value *, Value *>
-getAsConstantIndexedAddress(Type *ElemTy, Value *V, const DataLayout &DL) {
- Type *IndexType = IntegerType::get(V->getContext(),
- DL.getIndexTypeSizeInBits(V->getType()));
-
- Constant *Index = ConstantInt::getNullValue(IndexType);
- while (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
- // We accept only inbouds GEPs here to exclude the possibility of
- // overflow.
- if (!GEP->isInBounds())
- break;
- if (GEP->hasAllConstantIndices() && GEP->getNumIndices() == 1 &&
- GEP->getSourceElementType() == ElemTy &&
- GEP->getOperand(1)->getType() == IndexType) {
- V = GEP->getOperand(0);
- Constant *GEPIndex = static_cast<Constant *>(GEP->getOperand(1));
- Index = ConstantExpr::getAdd(Index, GEPIndex);
- continue;
- }
- break;
- }
- return {V, Index};
-}
-
/// Converts (CMP GEPLHS, RHS) if this change would make RHS a constant.
/// We can look through PHIs, GEPs and casts in order to determine a common base
/// between GEPLHS and RHS.
@@ -675,14 +628,19 @@ static Instruction *transformToIndexedCompare(GEPOperator *GEPLHS, Value *RHS,
if (!GEPLHS->hasAllConstantIndices())
return nullptr;
- Type *ElemTy = GEPLHS->getSourceElementType();
- Value *PtrBase, *Index;
- std::tie(PtrBase, Index) = getAsConstantIndexedAddress(ElemTy, GEPLHS, DL);
+ APInt Offset(DL.getIndexTypeSizeInBits(GEPLHS->getType()), 0);
+ Value *PtrBase =
+ GEPLHS->stripAndAccumulateConstantOffsets(DL, Offset,
+ /*AllowNonInbounds*/ false);
+
+ // Bail if we looked through addrspacecast.
+ if (PtrBase->getType() != GEPLHS->getType())
+ return nullptr;
// The set of nodes that will take part in this transformation.
SetVector<Value *> Nodes;
- if (!canRewriteGEPAsOffset(ElemTy, RHS, PtrBase, DL, Nodes))
+ if (!canRewriteGEPAsOffset(RHS, PtrBase, DL, Nodes))
return nullptr;
// We know we can re-write this as
@@ -691,13 +649,14 @@ static Instruction *transformToIndexedCompare(GEPOperator *GEPLHS, Value *RHS,
// can't have overflow on either side. We can therefore re-write
// this as:
// OFFSET1 cmp OFFSET2
- Value *NewRHS = rewriteGEPAsOffset(ElemTy, RHS, PtrBase, DL, Nodes, IC);
+ Value *NewRHS = rewriteGEPAsOffset(RHS, PtrBase, DL, Nodes, IC);
// RewriteGEPAsOffset has replaced RHS and all of its uses with a re-written
// GEP having PtrBase as the pointer base, and has returned in NewRHS the
// offset. Since Index is the offset of LHS to the base pointer, we will now
// compare the offsets instead of comparing the pointers.
- return new ICmpInst(ICmpInst::getSignedPredicate(Cond), Index, NewRHS);
+ return new ICmpInst(ICmpInst::getSignedPredicate(Cond),
+ IC.Builder.getInt(Offset), NewRHS);
}
/// Fold comparisons between a GEP instruction and something else. At this point
diff --git a/llvm/test/Transforms/InstCombine/indexed-gep-compares.ll b/llvm/test/Transforms/InstCombine/indexed-gep-compares.ll
index 80b61b19a2c1938..61cf727fb6c8c8b 100644
--- a/llvm/test/Transforms/InstCombine/indexed-gep-compares.ll
+++ b/llvm/test/Transforms/InstCombine/indexed-gep-compares.ll
@@ -6,14 +6,15 @@ target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f3
define ptr at test1(ptr %A, i32 %Offset) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i32 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i32 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i32 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
;
entry:
@@ -34,15 +35,16 @@ bb2:
define ptr at test2(i32 %A, i32 %Offset) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i32 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
; CHECK-NEXT: [[A_PTR:%.*]] = inttoptr i32 [[A:%.*]] to ptr
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A_PTR]], i32 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A_PTR]], i32 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
;
entry:
@@ -157,16 +159,17 @@ bb2:
define ptr at test4(i16 %A, i32 %Offset) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i32 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
; CHECK-NEXT: [[TMP0:%.*]] = zext i16 [[A:%.*]] to i32
; CHECK-NEXT: [[A_PTR:%.*]] = inttoptr i32 [[TMP0]] to ptr
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A_PTR]], i32 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A_PTR]], i32 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
;
entry:
@@ -195,14 +198,15 @@ define ptr at test5(i32 %Offset) personality ptr @__gxx_personality_v0 {
; CHECK-NEXT: [[A:%.*]] = invoke ptr @fun_ptr()
; CHECK-NEXT: to label [[CONT:%.*]] unwind label [[LPAD:%.*]]
; CHECK: cont:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i32 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[CONT]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[CONT]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A]], i32 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A]], i32 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
; CHECK: lpad:
; CHECK-NEXT: [[L:%.*]] = landingpad { ptr, i32 }
@@ -239,15 +243,16 @@ define ptr at test6(i32 %Offset) personality ptr @__gxx_personality_v0 {
; CHECK-NEXT: [[A:%.*]] = invoke i32 @fun_i32()
; CHECK-NEXT: to label [[CONT:%.*]] unwind label [[LPAD:%.*]]
; CHECK: cont:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i32 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[CONT]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i32 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[CONT]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i32 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i32 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
; CHECK-NEXT: [[A_PTR:%.*]] = inttoptr i32 [[A]] to ptr
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A_PTR]], i32 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A_PTR]], i32 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
; CHECK: lpad:
; CHECK-NEXT: [[L:%.*]] = landingpad { ptr, i32 }
diff --git a/llvm/test/Transforms/InstCombine/opaque-ptr.ll b/llvm/test/Transforms/InstCombine/opaque-ptr.ll
index 900d3f142a6ff79..4448a49ad92bf5d 100644
--- a/llvm/test/Transforms/InstCombine/opaque-ptr.ll
+++ b/llvm/test/Transforms/InstCombine/opaque-ptr.ll
@@ -382,14 +382,15 @@ define <4 x i1> @compare_geps_same_indices_scalar_vector_base_mismatch(ptr %ptr,
define ptr @indexed_compare(ptr %A, i64 %offset) {
; CHECK-LABEL: @indexed_compare(
; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i64 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i64 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[OFFSET:%.*]], [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[RHS_ADD]] = add nsw i64 [[RHS_IDX]], 1
-; CHECK-NEXT: [[COND:%.*]] = icmp sgt i64 [[RHS_IDX]], 100
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i64 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i64 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i64 [[RHS_IDX]], 400
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
-; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[RHS_IDX]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[RHS_IDX]]
; CHECK-NEXT: ret ptr [[RHS_PTR]]
;
entry:
@@ -410,16 +411,16 @@ bb2:
define ptr @indexed_compare_
diff erent_types(ptr %A, i64 %offset) {
; CHECK-LABEL: @indexed_compare_
diff erent_types(
; CHECK-NEXT: entry:
-; CHECK-NEXT: [[TMP:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[OFFSET:%.*]]
+; CHECK-NEXT: [[TMP_IDX:%.*]] = shl nsw i64 [[OFFSET:%.*]], 2
; CHECK-NEXT: br label [[BB:%.*]]
; CHECK: bb:
-; CHECK-NEXT: [[RHS:%.*]] = phi ptr [ [[RHS_NEXT:%.*]], [[BB]] ], [ [[TMP]], [[ENTRY:%.*]] ]
-; CHECK-NEXT: [[LHS:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 100
-; CHECK-NEXT: [[RHS_NEXT]] = getelementptr inbounds i32, ptr [[RHS]], i64 1
-; CHECK-NEXT: [[COND:%.*]] = icmp ult ptr [[LHS]], [[RHS]]
+; CHECK-NEXT: [[RHS_IDX:%.*]] = phi i64 [ [[RHS_ADD:%.*]], [[BB]] ], [ [[TMP_IDX]], [[ENTRY:%.*]] ]
+; CHECK-NEXT: [[RHS_ADD]] = add nsw i64 [[RHS_IDX]], 4
+; CHECK-NEXT: [[COND:%.*]] = icmp sgt i64 [[RHS_IDX]], 800
; CHECK-NEXT: br i1 [[COND]], label [[BB2:%.*]], label [[BB]]
; CHECK: bb2:
-; CHECK-NEXT: ret ptr [[RHS]]
+; CHECK-NEXT: [[RHS_PTR:%.*]] = getelementptr inbounds i8, ptr [[A:%.*]], i64 [[RHS_IDX]]
+; CHECK-NEXT: ret ptr [[RHS_PTR]]
;
entry:
%tmp = getelementptr inbounds i32, ptr %A, i64 %offset
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