[llvm] [VPlan] Use VPTypeAnalysis to get the step type of widen pointer induction (PR #147925)
Mel Chen via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 23 02:54:59 PDT 2025
https://github.com/Mel-Chen updated https://github.com/llvm/llvm-project/pull/147925
>From 12610e06e59f11ca59f1129ccfecce8df6a77d67 Mon Sep 17 00:00:00 2001
From: Mel Chen <mel.chen at sifive.com>
Date: Thu, 10 Jul 2025 02:06:53 -0700
Subject: [PATCH 1/3] [VPlan] Use VPTypeAnalysis to get the step type of widen
pointer induction
---
.../Transforms/Vectorize/VPlanTransforms.cpp | 4 +-
.../ivopt-widen-ptr-induction.ll | 75 +++++++++++++++++++
2 files changed, 77 insertions(+), 2 deletions(-)
create mode 100644 llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index cb370fe0e5b65..c7bcf740bd369 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -854,8 +854,8 @@ optimizeLatchExitInductionUser(VPlan &Plan, VPTypeAnalysis &TypeInfo,
if (ScalarTy->isIntegerTy())
return B.createNaryOp(Instruction::Sub, {EndValue, Step}, {}, "ind.escape");
if (ScalarTy->isPointerTy()) {
- auto *Zero = Plan.getOrAddLiveIn(
- ConstantInt::get(Step->getLiveInIRValue()->getType(), 0));
+ Type *StepTy = TypeInfo.inferScalarType(Step);
+ auto *Zero = Plan.getOrAddLiveIn(ConstantInt::get(StepTy, 0));
return B.createPtrAdd(EndValue,
B.createNaryOp(Instruction::Sub, {Zero, Step}), {},
"ind.escape");
diff --git a/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll b/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
new file mode 100644
index 0000000000000..e24c112e9e65c
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
@@ -0,0 +1,75 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -lv-strided-pointer-ivs -S < %s | FileCheck %s
+
+define i64 @widen_ptr_indvar(ptr noalias %a, ptr noalias %b ,i64 %stride, i64 %n) {
+; CHECK-LABEL: define i64 @widen_ptr_indvar(
+; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[STRIDE:%.*]], i64 [[N:%.*]]) {
+; CHECK-NEXT: [[ENTRY:.*]]:
+; CHECK-NEXT: [[TMP9:%.*]] = add i64 [[N]], 1
+; CHECK-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE]], 3
+; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP9]], 4
+; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
+; CHECK: [[VECTOR_PH]]:
+; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP9]], 4
+; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP9]], [[N_MOD_VF]]
+; CHECK-NEXT: [[TMP2:%.*]] = mul i64 [[N_VEC]], [[TMP1]]
+; CHECK-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
+; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
+; CHECK: [[VECTOR_BODY]]:
+; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDEX]]
+; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i64, ptr [[TMP4]], i32 0
+; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP5]], align 8
+; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK: [[MIDDLE_BLOCK]]:
+; CHECK-NEXT: [[TMP7:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
+; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP9]], [[N_VEC]]
+; CHECK-NEXT: [[TMP8:%.*]] = sub i64 0, [[TMP1]]
+; CHECK-NEXT: [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[TMP3]], i64 [[TMP8]]
+; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
+; CHECK: [[SCALAR_PH]]:
+; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
+; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[TMP3]], %[[MIDDLE_BLOCK]] ], [ null, %[[ENTRY]] ]
+; CHECK-NEXT: br label %[[FOR_BODY:.*]]
+; CHECK: [[FOR_BODY]]:
+; CHECK-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], %[[FOR_BODY]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
+; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[FOR_BODY]] ], [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ]
+; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDVAR]]
+; CHECK-NEXT: [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE]]
+; CHECK-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N]]
+; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label %[[EXIT]], label %[[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
+; CHECK: [[EXIT]]:
+; CHECK-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], %[[FOR_BODY]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK]] ]
+; CHECK-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP0]], %[[FOR_BODY]] ], [ [[TMP7]], %[[MIDDLE_BLOCK]] ]
+; CHECK-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
+; CHECK-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; CHECK-NEXT: ret i64 [[RESULT]]
+;
+entry:
+ br label %for.body
+
+for.body:
+ %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
+ %ptr.iv = phi ptr [ %ptr.iv.next, %for.body ], [ null, %entry ]
+ %arrayidx = getelementptr i64, ptr %a, i64 %indvar
+ %0 = load i64, ptr %arrayidx, align 8
+ %ptr.iv.next = getelementptr i64, ptr %ptr.iv, i64 %stride
+ %indvar.next = add i64 %indvar, 1
+ %exitcond.not = icmp eq i64 %indvar, %n
+ br i1 %exitcond.not, label %exit, label %for.body
+
+exit:
+ %cast.ptr = ptrtoint ptr %ptr.iv to i64
+ %result = add i64 %cast.ptr, %0
+ ret i64 %result
+}
+;.
+; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
+; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
+; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
+; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META2]], [[META1]]}
+;.
>From f98171cd35ee153de8d03073f7758de6974bcb0a Mon Sep 17 00:00:00 2001
From: Mel Chen <mel.chen at sifive.com>
Date: Wed, 23 Jul 2025 02:16:05 -0700
Subject: [PATCH 2/3] move test case
---
.../ivopt-widen-ptr-induction.ll | 75 ----------------
.../LoopVectorize/pointer-induction.ll | 85 +++++++++++++++++++
2 files changed, 85 insertions(+), 75 deletions(-)
delete mode 100644 llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
diff --git a/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll b/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
deleted file mode 100644
index e24c112e9e65c..0000000000000
--- a/llvm/test/Transforms/LoopVectorize/ivopt-widen-ptr-induction.ll
+++ /dev/null
@@ -1,75 +0,0 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
-; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -lv-strided-pointer-ivs -S < %s | FileCheck %s
-
-define i64 @widen_ptr_indvar(ptr noalias %a, ptr noalias %b ,i64 %stride, i64 %n) {
-; CHECK-LABEL: define i64 @widen_ptr_indvar(
-; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[STRIDE:%.*]], i64 [[N:%.*]]) {
-; CHECK-NEXT: [[ENTRY:.*]]:
-; CHECK-NEXT: [[TMP9:%.*]] = add i64 [[N]], 1
-; CHECK-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE]], 3
-; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP9]], 4
-; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
-; CHECK: [[VECTOR_PH]]:
-; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP9]], 4
-; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP9]], [[N_MOD_VF]]
-; CHECK-NEXT: [[TMP2:%.*]] = mul i64 [[N_VEC]], [[TMP1]]
-; CHECK-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
-; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
-; CHECK: [[VECTOR_BODY]]:
-; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDEX]]
-; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i64, ptr [[TMP4]], i32 0
-; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP5]], align 8
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
-; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
-; CHECK: [[MIDDLE_BLOCK]]:
-; CHECK-NEXT: [[TMP7:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
-; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP9]], [[N_VEC]]
-; CHECK-NEXT: [[TMP8:%.*]] = sub i64 0, [[TMP1]]
-; CHECK-NEXT: [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[TMP3]], i64 [[TMP8]]
-; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
-; CHECK: [[SCALAR_PH]]:
-; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
-; CHECK-NEXT: [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[TMP3]], %[[MIDDLE_BLOCK]] ], [ null, %[[ENTRY]] ]
-; CHECK-NEXT: br label %[[FOR_BODY:.*]]
-; CHECK: [[FOR_BODY]]:
-; CHECK-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], %[[FOR_BODY]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
-; CHECK-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], %[[FOR_BODY]] ], [ [[BC_RESUME_VAL1]], %[[SCALAR_PH]] ]
-; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDVAR]]
-; CHECK-NEXT: [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
-; CHECK-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE]]
-; CHECK-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
-; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N]]
-; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label %[[EXIT]], label %[[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
-; CHECK: [[EXIT]]:
-; CHECK-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], %[[FOR_BODY]] ], [ [[IND_ESCAPE]], %[[MIDDLE_BLOCK]] ]
-; CHECK-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP0]], %[[FOR_BODY]] ], [ [[TMP7]], %[[MIDDLE_BLOCK]] ]
-; CHECK-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
-; CHECK-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
-; CHECK-NEXT: ret i64 [[RESULT]]
-;
-entry:
- br label %for.body
-
-for.body:
- %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
- %ptr.iv = phi ptr [ %ptr.iv.next, %for.body ], [ null, %entry ]
- %arrayidx = getelementptr i64, ptr %a, i64 %indvar
- %0 = load i64, ptr %arrayidx, align 8
- %ptr.iv.next = getelementptr i64, ptr %ptr.iv, i64 %stride
- %indvar.next = add i64 %indvar, 1
- %exitcond.not = icmp eq i64 %indvar, %n
- br i1 %exitcond.not, label %exit, label %for.body
-
-exit:
- %cast.ptr = ptrtoint ptr %ptr.iv to i64
- %result = add i64 %cast.ptr, %0
- ret i64 %result
-}
-;.
-; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
-; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
-; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
-; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META2]], [[META1]]}
-;.
diff --git a/llvm/test/Transforms/LoopVectorize/pointer-induction.ll b/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
index a4f2b077cb066..377bea92c86d4 100644
--- a/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
+++ b/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
@@ -420,3 +420,88 @@ for.body: ; preds = %for.body, %entry
for.end: ; preds = %for.body
ret void
}
+
+define i64 @ivopt_widen_ptr_indvar(ptr noalias %a, ptr noalias %b ,i64 %stride, i64 %n) {
+; DEFAULT-LABEL: @ivopt_widen_ptr_indvar(
+; DEFAULT-NEXT: entry:
+; DEFAULT-NEXT: br label [[FOR_BODY:%.*]]
+; DEFAULT: for.body:
+; DEFAULT-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
+; DEFAULT-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ null, [[ENTRY]] ]
+; DEFAULT-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDVAR]]
+; DEFAULT-NEXT: [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; DEFAULT-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE:%.*]]
+; DEFAULT-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; DEFAULT-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N:%.*]]
+; DEFAULT-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label [[FOR_BODY]]
+; DEFAULT: exit:
+; DEFAULT-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
+; DEFAULT-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; DEFAULT-NEXT: ret i64 [[RESULT]]
+;
+; STRIDED-LABEL: @ivopt_widen_ptr_indvar(
+; STRIDED-NEXT: entry:
+; STRIDED-NEXT: [[TMP0:%.*]] = add i64 [[N:%.*]], 1
+; STRIDED-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE:%.*]], 3
+; STRIDED-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
+; STRIDED-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; STRIDED: vector.ph:
+; STRIDED-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
+; STRIDED-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
+; STRIDED-NEXT: [[TMP2:%.*]] = mul i64 [[N_VEC]], [[TMP1]]
+; STRIDED-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
+; STRIDED-NEXT: br label [[VECTOR_BODY:%.*]]
+; STRIDED: vector.body:
+; STRIDED-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; STRIDED-NEXT: [[TMP4:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDEX]]
+; STRIDED-NEXT: [[TMP5:%.*]] = getelementptr i64, ptr [[TMP4]], i32 0
+; STRIDED-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP5]], align 8
+; STRIDED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; STRIDED-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; STRIDED-NEXT: br i1 [[TMP6]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
+; STRIDED: middle.block:
+; STRIDED-NEXT: [[TMP7:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
+; STRIDED-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
+; STRIDED-NEXT: [[TMP8:%.*]] = sub i64 0, [[TMP1]]
+; STRIDED-NEXT: [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[TMP3]], i64 [[TMP8]]
+; STRIDED-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; STRIDED: scalar.ph:
+; STRIDED-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; STRIDED-NEXT: [[BC_RESUME_VAL1:%.*]] = phi ptr [ [[TMP3]], [[MIDDLE_BLOCK]] ], [ null, [[ENTRY]] ]
+; STRIDED-NEXT: br label [[FOR_BODY:%.*]]
+; STRIDED: for.body:
+; STRIDED-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL1]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDVAR]]
+; STRIDED-NEXT: [[TMP9:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; STRIDED-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE]]
+; STRIDED-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; STRIDED-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N]]
+; STRIDED-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP11:![0-9]+]]
+; STRIDED: exit:
+; STRIDED-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], [[FOR_BODY]] ], [ [[IND_ESCAPE]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP9]], [[FOR_BODY]] ], [ [[TMP7]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
+; STRIDED-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; STRIDED-NEXT: ret i64 [[RESULT]]
+;
+entry:
+ br label %for.body
+
+for.body:
+ %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
+ %ptr.iv = phi ptr [ %ptr.iv.next, %for.body ], [ null, %entry ]
+ %arrayidx = getelementptr i64, ptr %a, i64 %indvar
+ %0 = load i64, ptr %arrayidx, align 8
+ %ptr.iv.next = getelementptr i64, ptr %ptr.iv, i64 %stride
+ %indvar.next = add i64 %indvar, 1
+ %exitcond.not = icmp eq i64 %indvar, %n
+ br i1 %exitcond.not, label %exit, label %for.body
+
+exit:
+ %cast.ptr = ptrtoint ptr %ptr.iv to i64
+ %result = add i64 %cast.ptr, %0
+ ret i64 %result
+}
>From d8e84140aa84f03aab41f6f41eb186ea505a6de1 Mon Sep 17 00:00:00 2001
From: Mel Chen <mel.chen at sifive.com>
Date: Wed, 23 Jul 2025 02:53:49 -0700
Subject: [PATCH 3/3] Add more tests
---
.../LoopVectorize/pointer-induction.ll | 212 +++++++++++++++++-
1 file changed, 209 insertions(+), 3 deletions(-)
diff --git a/llvm/test/Transforms/LoopVectorize/pointer-induction.ll b/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
index 377bea92c86d4..5f65e13fc56b6 100644
--- a/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
+++ b/llvm/test/Transforms/LoopVectorize/pointer-induction.ll
@@ -421,8 +421,8 @@ for.end: ; preds = %for.body
ret void
}
-define i64 @ivopt_widen_ptr_indvar(ptr noalias %a, ptr noalias %b ,i64 %stride, i64 %n) {
-; DEFAULT-LABEL: @ivopt_widen_ptr_indvar(
+define i64 @ivopt_widen_ptr_indvar_1(ptr noalias %a, i64 %stride, i64 %n) {
+; DEFAULT-LABEL: @ivopt_widen_ptr_indvar_1(
; DEFAULT-NEXT: entry:
; DEFAULT-NEXT: br label [[FOR_BODY:%.*]]
; DEFAULT: for.body:
@@ -441,7 +441,7 @@ define i64 @ivopt_widen_ptr_indvar(ptr noalias %a, ptr noalias %b ,i64 %stride,
; DEFAULT-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
; DEFAULT-NEXT: ret i64 [[RESULT]]
;
-; STRIDED-LABEL: @ivopt_widen_ptr_indvar(
+; STRIDED-LABEL: @ivopt_widen_ptr_indvar_1(
; STRIDED-NEXT: entry:
; STRIDED-NEXT: [[TMP0:%.*]] = add i64 [[N:%.*]], 1
; STRIDED-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE:%.*]], 3
@@ -505,3 +505,209 @@ exit:
%result = add i64 %cast.ptr, %0
ret i64 %result
}
+
+define i64 @ivopt_widen_ptr_indvar_2(ptr noalias %a, i64 %stride, i64 %n) {
+; DEFAULT-LABEL: @ivopt_widen_ptr_indvar_2(
+; DEFAULT-NEXT: entry:
+; DEFAULT-NEXT: br label [[FOR_BODY:%.*]]
+; DEFAULT: for.body:
+; DEFAULT-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
+; DEFAULT-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ null, [[ENTRY]] ]
+; DEFAULT-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDVAR]]
+; DEFAULT-NEXT: [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; DEFAULT-NEXT: store i64 [[TMP0]], ptr [[PTR_IV]], align 8
+; DEFAULT-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE:%.*]]
+; DEFAULT-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; DEFAULT-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N:%.*]]
+; DEFAULT-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label [[FOR_BODY]]
+; DEFAULT: exit:
+; DEFAULT-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
+; DEFAULT-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; DEFAULT-NEXT: ret i64 [[RESULT]]
+;
+; STRIDED-LABEL: @ivopt_widen_ptr_indvar_2(
+; STRIDED-NEXT: entry:
+; STRIDED-NEXT: [[TMP0:%.*]] = add i64 [[N:%.*]], 1
+; STRIDED-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE:%.*]], 3
+; STRIDED-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
+; STRIDED-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; STRIDED: vector.ph:
+; STRIDED-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
+; STRIDED-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
+; STRIDED-NEXT: [[TMP2:%.*]] = mul i64 [[N_VEC]], [[TMP1]]
+; STRIDED-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
+; STRIDED-NEXT: br label [[VECTOR_BODY:%.*]]
+; STRIDED: vector.body:
+; STRIDED-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; STRIDED-NEXT: [[OFFSET_IDX:%.*]] = mul i64 [[INDEX]], [[TMP1]]
+; STRIDED-NEXT: [[TMP8:%.*]] = mul i64 0, [[TMP1]]
+; STRIDED-NEXT: [[TMP9:%.*]] = add i64 [[OFFSET_IDX]], [[TMP8]]
+; STRIDED-NEXT: [[TMP10:%.*]] = mul i64 1, [[TMP1]]
+; STRIDED-NEXT: [[TMP11:%.*]] = add i64 [[OFFSET_IDX]], [[TMP10]]
+; STRIDED-NEXT: [[TMP12:%.*]] = mul i64 2, [[TMP1]]
+; STRIDED-NEXT: [[TMP13:%.*]] = add i64 [[OFFSET_IDX]], [[TMP12]]
+; STRIDED-NEXT: [[TMP14:%.*]] = mul i64 3, [[TMP1]]
+; STRIDED-NEXT: [[TMP15:%.*]] = add i64 [[OFFSET_IDX]], [[TMP14]]
+; STRIDED-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, ptr null, i64 [[TMP9]]
+; STRIDED-NEXT: [[NEXT_GEP1:%.*]] = getelementptr i8, ptr null, i64 [[TMP11]]
+; STRIDED-NEXT: [[NEXT_GEP2:%.*]] = getelementptr i8, ptr null, i64 [[TMP13]]
+; STRIDED-NEXT: [[NEXT_GEP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP15]]
+; STRIDED-NEXT: [[TMP21:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDEX]]
+; STRIDED-NEXT: [[TMP22:%.*]] = getelementptr i64, ptr [[TMP21]], i32 0
+; STRIDED-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP22]], align 8
+; STRIDED-NEXT: [[TMP23:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 0
+; STRIDED-NEXT: store i64 [[TMP23]], ptr [[NEXT_GEP]], align 8
+; STRIDED-NEXT: [[TMP24:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 1
+; STRIDED-NEXT: store i64 [[TMP24]], ptr [[NEXT_GEP1]], align 8
+; STRIDED-NEXT: [[TMP16:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 2
+; STRIDED-NEXT: store i64 [[TMP16]], ptr [[NEXT_GEP2]], align 8
+; STRIDED-NEXT: [[TMP25:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
+; STRIDED-NEXT: store i64 [[TMP25]], ptr [[NEXT_GEP3]], align 8
+; STRIDED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; STRIDED-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; STRIDED-NEXT: br i1 [[TMP18]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]]
+; STRIDED: middle.block:
+; STRIDED-NEXT: [[TMP17:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
+; STRIDED-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
+; STRIDED-NEXT: [[TMP19:%.*]] = sub i64 0, [[TMP1]]
+; STRIDED-NEXT: [[IND_ESCAPE:%.*]] = getelementptr i8, ptr [[TMP3]], i64 [[TMP19]]
+; STRIDED-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; STRIDED: scalar.ph:
+; STRIDED-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; STRIDED-NEXT: [[BC_RESUME_VAL4:%.*]] = phi ptr [ [[TMP3]], [[MIDDLE_BLOCK]] ], [ null, [[ENTRY]] ]
+; STRIDED-NEXT: br label [[FOR_BODY:%.*]]
+; STRIDED: for.body:
+; STRIDED-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL4]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDVAR]]
+; STRIDED-NEXT: [[TMP20:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; STRIDED-NEXT: store i64 [[TMP20]], ptr [[PTR_IV]], align 8
+; STRIDED-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE]]
+; STRIDED-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; STRIDED-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N]]
+; STRIDED-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP13:![0-9]+]]
+; STRIDED: exit:
+; STRIDED-NEXT: [[PTR_IV_LCSSA:%.*]] = phi ptr [ [[PTR_IV]], [[FOR_BODY]] ], [ [[IND_ESCAPE]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP20]], [[FOR_BODY]] ], [ [[TMP17]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_LCSSA]] to i64
+; STRIDED-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; STRIDED-NEXT: ret i64 [[RESULT]]
+;
+entry:
+ br label %for.body
+
+for.body:
+ %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
+ %ptr.iv = phi ptr [ %ptr.iv.next, %for.body ], [ null, %entry ]
+ %arrayidx = getelementptr i64, ptr %a, i64 %indvar
+ %0 = load i64, ptr %arrayidx, align 8
+ store i64 %0, ptr %ptr.iv, align 8
+ %ptr.iv.next = getelementptr i64, ptr %ptr.iv, i64 %stride
+ %indvar.next = add i64 %indvar, 1
+ %exitcond.not = icmp eq i64 %indvar, %n
+ br i1 %exitcond.not, label %exit, label %for.body
+
+exit:
+ %cast.ptr = ptrtoint ptr %ptr.iv to i64
+ %result = add i64 %cast.ptr, %0
+ ret i64 %result
+}
+
+define i64 @ivopt_widen_ptr_indvar_3(ptr noalias %a, i64 %stride, i64 %n) {
+; DEFAULT-LABEL: @ivopt_widen_ptr_indvar_3(
+; DEFAULT-NEXT: entry:
+; DEFAULT-NEXT: br label [[FOR_BODY:%.*]]
+; DEFAULT: for.body:
+; DEFAULT-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ]
+; DEFAULT-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ null, [[ENTRY]] ]
+; DEFAULT-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDVAR]]
+; DEFAULT-NEXT: [[TMP0:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; DEFAULT-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE:%.*]]
+; DEFAULT-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; DEFAULT-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N:%.*]]
+; DEFAULT-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label [[FOR_BODY]]
+; DEFAULT: exit:
+; DEFAULT-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[PTR_IV_NEXT_LCSSA:%.*]] = phi ptr [ [[PTR_IV_NEXT]], [[FOR_BODY]] ]
+; DEFAULT-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_NEXT_LCSSA]] to i64
+; DEFAULT-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; DEFAULT-NEXT: ret i64 [[RESULT]]
+;
+; STRIDED-LABEL: @ivopt_widen_ptr_indvar_3(
+; STRIDED-NEXT: entry:
+; STRIDED-NEXT: [[TMP0:%.*]] = add i64 [[N:%.*]], 1
+; STRIDED-NEXT: [[TMP1:%.*]] = shl i64 [[STRIDE:%.*]], 3
+; STRIDED-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
+; STRIDED-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; STRIDED: vector.ph:
+; STRIDED-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
+; STRIDED-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
+; STRIDED-NEXT: [[TMP2:%.*]] = mul i64 [[N_VEC]], [[TMP1]]
+; STRIDED-NEXT: [[TMP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
+; STRIDED-NEXT: br label [[VECTOR_BODY:%.*]]
+; STRIDED: vector.body:
+; STRIDED-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; STRIDED-NEXT: [[OFFSET_IDX:%.*]] = mul i64 [[INDEX]], [[TMP1]]
+; STRIDED-NEXT: [[TMP4:%.*]] = mul i64 0, [[TMP1]]
+; STRIDED-NEXT: [[TMP5:%.*]] = add i64 [[OFFSET_IDX]], [[TMP4]]
+; STRIDED-NEXT: [[TMP6:%.*]] = mul i64 1, [[TMP1]]
+; STRIDED-NEXT: [[TMP7:%.*]] = add i64 [[OFFSET_IDX]], [[TMP6]]
+; STRIDED-NEXT: [[TMP8:%.*]] = mul i64 2, [[TMP1]]
+; STRIDED-NEXT: [[TMP9:%.*]] = add i64 [[OFFSET_IDX]], [[TMP8]]
+; STRIDED-NEXT: [[TMP10:%.*]] = mul i64 3, [[TMP1]]
+; STRIDED-NEXT: [[TMP11:%.*]] = add i64 [[OFFSET_IDX]], [[TMP10]]
+; STRIDED-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, ptr null, i64 [[TMP5]]
+; STRIDED-NEXT: [[NEXT_GEP1:%.*]] = getelementptr i8, ptr null, i64 [[TMP7]]
+; STRIDED-NEXT: [[NEXT_GEP2:%.*]] = getelementptr i8, ptr null, i64 [[TMP9]]
+; STRIDED-NEXT: [[NEXT_GEP3:%.*]] = getelementptr i8, ptr null, i64 [[TMP11]]
+; STRIDED-NEXT: [[TMP12:%.*]] = getelementptr i64, ptr [[A:%.*]], i64 [[INDEX]]
+; STRIDED-NEXT: [[TMP13:%.*]] = getelementptr i64, ptr [[TMP12]], i32 0
+; STRIDED-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP13]], align 8
+; STRIDED-NEXT: [[TMP14:%.*]] = getelementptr i64, ptr [[NEXT_GEP3]], i64 [[STRIDE]]
+; STRIDED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; STRIDED-NEXT: [[TMP15:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; STRIDED-NEXT: br i1 [[TMP15]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]]
+; STRIDED: middle.block:
+; STRIDED-NEXT: [[TMP16:%.*]] = extractelement <4 x i64> [[WIDE_LOAD]], i32 3
+; STRIDED-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
+; STRIDED-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; STRIDED: scalar.ph:
+; STRIDED-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; STRIDED-NEXT: [[BC_RESUME_VAL4:%.*]] = phi ptr [ [[TMP3]], [[MIDDLE_BLOCK]] ], [ null, [[ENTRY]] ]
+; STRIDED-NEXT: br label [[FOR_BODY:%.*]]
+; STRIDED: for.body:
+; STRIDED-NEXT: [[INDVAR:%.*]] = phi i64 [ [[INDVAR_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[PTR_IV:%.*]] = phi ptr [ [[PTR_IV_NEXT:%.*]], [[FOR_BODY]] ], [ [[BC_RESUME_VAL4]], [[SCALAR_PH]] ]
+; STRIDED-NEXT: [[ARRAYIDX:%.*]] = getelementptr i64, ptr [[A]], i64 [[INDVAR]]
+; STRIDED-NEXT: [[TMP17:%.*]] = load i64, ptr [[ARRAYIDX]], align 8
+; STRIDED-NEXT: [[PTR_IV_NEXT]] = getelementptr i64, ptr [[PTR_IV]], i64 [[STRIDE]]
+; STRIDED-NEXT: [[INDVAR_NEXT]] = add i64 [[INDVAR]], 1
+; STRIDED-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVAR]], [[N]]
+; STRIDED-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[FOR_BODY]], !llvm.loop [[LOOP15:![0-9]+]]
+; STRIDED: exit:
+; STRIDED-NEXT: [[DOTLCSSA:%.*]] = phi i64 [ [[TMP17]], [[FOR_BODY]] ], [ [[TMP16]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[PTR_IV_NEXT_LCSSA:%.*]] = phi ptr [ [[PTR_IV_NEXT]], [[FOR_BODY]] ], [ [[TMP14]], [[MIDDLE_BLOCK]] ]
+; STRIDED-NEXT: [[CAST_PTR:%.*]] = ptrtoint ptr [[PTR_IV_NEXT_LCSSA]] to i64
+; STRIDED-NEXT: [[RESULT:%.*]] = add i64 [[CAST_PTR]], [[DOTLCSSA]]
+; STRIDED-NEXT: ret i64 [[RESULT]]
+;
+entry:
+ br label %for.body
+
+for.body:
+ %indvar = phi i64 [ %indvar.next, %for.body ], [ 0, %entry ]
+ %ptr.iv = phi ptr [ %ptr.iv.next, %for.body ], [ null, %entry ]
+ %arrayidx = getelementptr i64, ptr %a, i64 %indvar
+ %0 = load i64, ptr %arrayidx, align 8
+ %ptr.iv.next = getelementptr i64, ptr %ptr.iv, i64 %stride
+ %indvar.next = add i64 %indvar, 1
+ %exitcond.not = icmp eq i64 %indvar, %n
+ br i1 %exitcond.not, label %exit, label %for.body
+
+exit:
+ %cast.ptr = ptrtoint ptr %ptr.iv.next to i64
+ %result = add i64 %cast.ptr, %0
+ ret i64 %result
+}
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