[llvm] [LV] Add test for tail fold by masking with external IV users. (PR #82329)
Niwin Anto via llvm-commits
llvm-commits at lists.llvm.org
Wed Feb 28 04:51:54 PST 2024
https://github.com/niwinanto updated https://github.com/llvm/llvm-project/pull/82329
>From ee95e2c242e28355d2cb8dbfe8506d82147c0d0f Mon Sep 17 00:00:00 2001
From: Niwin Anto <niwin.anto at hightec-rt.com>
Date: Tue, 13 Feb 2024 20:25:52 +0100
Subject: [PATCH 1/3] [FIXME] Add test case for tail fold my masking with
external users
---
...o-fold-tail-by-masking-iv-external-uses.ll | 122 ++++++++++++++++++
1 file changed, 122 insertions(+)
create mode 100644 llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
diff --git a/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
new file mode 100644
index 00000000000000..0e9f00e8224785
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
@@ -0,0 +1,122 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt < %s -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s
+
+; The vectorizer should refuse to fold the tail by masking because
+; %conv is used outside of the loop. Test for this by checking that
+; %n.vec, the vector trip count, is rounded down to the next multiple of
+; 4. If folding the tail, it would have been rounded up instead.
+; Test case for #76069.
+define i32 @test(ptr %arr, i64 %n) {
+; CHECK-LABEL: define i32 @test(
+; CHECK-SAME: ptr [[ARR:%.*]], i64 [[N:%.*]]) {
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[CMP1:%.*]] = icmp ugt i64 [[N]], 1
+; CHECK-NEXT: br i1 [[CMP1]], label [[PREHEADER:%.*]], label [[DONE:%.*]]
+; CHECK: preheader:
+; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[N]], -1
+; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
+; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
+; CHECK: vector.scevcheck:
+; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[N]], -2
+; CHECK-NEXT: [[TMP2:%.*]] = trunc i64 [[TMP1]] to i8
+; CHECK-NEXT: [[TMP3:%.*]] = add i8 1, [[TMP2]]
+; CHECK-NEXT: [[TMP4:%.*]] = icmp ult i8 [[TMP3]], 1
+; CHECK-NEXT: [[TMP5:%.*]] = icmp ugt i64 [[TMP1]], 255
+; CHECK-NEXT: [[TMP6:%.*]] = or i1 [[TMP4]], [[TMP5]]
+; CHECK-NEXT: [[TMP7:%.*]] = trunc i64 [[TMP1]] to i8
+; CHECK-NEXT: [[TMP8:%.*]] = add i8 2, [[TMP7]]
+; CHECK-NEXT: [[TMP9:%.*]] = icmp ult i8 [[TMP8]], 2
+; CHECK-NEXT: [[TMP10:%.*]] = icmp ugt i64 [[TMP1]], 255
+; CHECK-NEXT: [[TMP11:%.*]] = or i1 [[TMP9]], [[TMP10]]
+; CHECK-NEXT: [[TMP12:%.*]] = or i1 [[TMP6]], [[TMP11]]
+; CHECK-NEXT: br i1 [[TMP12]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
+; CHECK: vector.ph:
+; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
+; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
+; CHECK-NEXT: [[IND_END:%.*]] = add i64 1, [[N_VEC]]
+; CHECK-NEXT: [[DOTCAST:%.*]] = trunc i64 [[N_VEC]] to i8
+; CHECK-NEXT: [[IND_END1:%.*]] = add i8 1, [[DOTCAST]]
+; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
+; CHECK: vector.body:
+; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]]
+; CHECK-NEXT: [[TMP13:%.*]] = add i64 [[OFFSET_IDX]], 0
+; CHECK-NEXT: [[TMP14:%.*]] = add i64 [[OFFSET_IDX]], 1
+; CHECK-NEXT: [[TMP15:%.*]] = add i64 [[OFFSET_IDX]], 2
+; CHECK-NEXT: [[TMP16:%.*]] = add i64 [[OFFSET_IDX]], 3
+; CHECK-NEXT: [[TMP17:%.*]] = add nsw i64 [[TMP13]], -1
+; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP17]]
+; CHECK-NEXT: [[TMP19:%.*]] = getelementptr inbounds i32, ptr [[TMP18]], i32 0
+; CHECK-NEXT: store <4 x i32> <i32 65, i32 65, i32 65, i32 65>, ptr [[TMP19]], align 4
+; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK: middle.block:
+; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
+; CHECK-NEXT: [[CMO:%.*]] = sub i64 [[N_VEC]], 1
+; CHECK-NEXT: [[IND_ESCAPE:%.*]] = add i64 1, [[CMO]]
+; CHECK-NEXT: br i1 [[CMP_N]], label [[LOAD_VAL:%.*]], label [[SCALAR_PH]]
+; CHECK: scalar.ph:
+; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ], [ 1, [[VECTOR_SCEVCHECK]] ]
+; CHECK-NEXT: [[BC_RESUME_VAL2:%.*]] = phi i8 [ [[IND_END1]], [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ], [ 1, [[VECTOR_SCEVCHECK]] ]
+; CHECK-NEXT: br label [[LOOP:%.*]]
+; CHECK: loop:
+; CHECK-NEXT: [[CONV:%.*]] = phi i64 [ [[CONV2:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
+; CHECK-NEXT: [[I:%.*]] = phi i8 [ [[INC:%.*]], [[LOOP]] ], [ [[BC_RESUME_VAL2]], [[SCALAR_PH]] ]
+; CHECK-NEXT: [[SUB:%.*]] = add nsw i64 [[CONV]], -1
+; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[SUB]]
+; CHECK-NEXT: store i32 65, ptr [[PTR]], align 4
+; CHECK-NEXT: [[INC]] = add i8 [[I]], 1
+; CHECK-NEXT: [[CONV2]] = zext i8 [[INC]] to i64
+; CHECK-NEXT: [[CMP2:%.*]] = icmp ult i64 [[CONV2]], [[N]]
+; CHECK-NEXT: br i1 [[CMP2]], label [[LOOP]], label [[LOAD_VAL]], !llvm.loop [[LOOP4:![0-9]+]]
+; CHECK: load_val:
+; CHECK-NEXT: [[FINAL:%.*]] = phi i64 [ [[CONV]], [[LOOP]] ], [ [[IND_ESCAPE]], [[MIDDLE_BLOCK]] ]
+; CHECK-NEXT: [[PTR2:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[FINAL]]
+; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[PTR2]], align 4
+; CHECK-NEXT: br label [[DONE]]
+; CHECK: done:
+; CHECK-NEXT: [[VALUE:%.*]] = phi i32 [ [[VAL]], [[LOAD_VAL]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT: ret i32 [[VALUE]]
+;
+entry:
+ %cmp1 = icmp ugt i64 %n, 1
+ br i1 %cmp1, label %preheader, label %done
+
+preheader:
+ br label %loop
+
+loop:
+ %conv = phi i64 [ %conv2, %loop ], [ 1, %preheader ]
+ %i = phi i8 [ %inc, %loop ], [ 1, %preheader ]
+ %sub = add nsw i64 %conv, -1
+ %ptr = getelementptr inbounds i32, ptr %arr, i64 %sub
+ store i32 65, ptr %ptr, align 4
+ %inc = add i8 %i, 1
+ %conv2 = zext i8 %inc to i64
+ %cmp2 = icmp ult i64 %conv2, %n
+ br i1 %cmp2, label %loop, label %load_val, !llvm.loop !0
+
+load_val:
+ %final = phi i64 [ %conv, %loop ]
+ %ptr2 = getelementptr inbounds i32, ptr %arr, i64 %final
+ %val = load i32, ptr %ptr2, align 4
+ br label %done
+
+done:
+ %value = phi i32 [ %val, %load_val ], [ 0, %entry ]
+ ret i32 %value
+
+}
+
+!0 = distinct !{!0, !1, !2, !3}
+!1 = !{!"llvm.loop.unroll.disable"}
+!2 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
+!3 = !{!"llvm.loop.vectorize.enable", i1 true}
+;.
+; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]], [[META3:![0-9]+]]}
+; CHECK: [[META1]] = !{!"llvm.loop.unroll.disable"}
+; CHECK: [[META2]] = !{!"llvm.loop.isvectorized", i32 1}
+; CHECK: [[META3]] = !{!"llvm.loop.unroll.runtime.disable"}
+; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
+;.
>From 8fe873800e269ef113d334a2ccf65da5810e9f21 Mon Sep 17 00:00:00 2001
From: Niwin Anto <niwinantop at gmail.com>
Date: Tue, 20 Feb 2024 16:32:51 +0100
Subject: [PATCH 2/3] Update test failure after rebase to upstream (#3)
* [FIXME] Add test case for tail fold my masking with external users
Co-authored-by: Niwin Anto <niwin.anto at hightec-rt.com>
---
...o-fold-tail-by-masking-iv-external-uses.ll | 65 +++++++++++++++----
1 file changed, 51 insertions(+), 14 deletions(-)
diff --git a/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
index 0e9f00e8224785..e4d4d81d4a8cea 100644
--- a/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
+++ b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
@@ -14,8 +14,7 @@ define i32 @test(ptr %arr, i64 %n) {
; CHECK-NEXT: br i1 [[CMP1]], label [[PREHEADER:%.*]], label [[DONE:%.*]]
; CHECK: preheader:
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[N]], -1
-; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 4
-; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
+; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]]
; CHECK: vector.scevcheck:
; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[N]], -2
; CHECK-NEXT: [[TMP2:%.*]] = trunc i64 [[TMP1]] to i8
@@ -31,31 +30,69 @@ define i32 @test(ptr %arr, i64 %n) {
; CHECK-NEXT: [[TMP12:%.*]] = or i1 [[TMP6]], [[TMP11]]
; CHECK-NEXT: br i1 [[TMP12]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
-; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 4
-; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
+; CHECK-NEXT: [[N_RND_UP:%.*]] = add i64 [[TMP0]], 3
+; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[N_RND_UP]], 4
+; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N_RND_UP]], [[N_MOD_VF]]
; CHECK-NEXT: [[IND_END:%.*]] = add i64 1, [[N_VEC]]
; CHECK-NEXT: [[DOTCAST:%.*]] = trunc i64 [[N_VEC]] to i8
; CHECK-NEXT: [[IND_END1:%.*]] = add i8 1, [[DOTCAST]]
+; CHECK-NEXT: [[TRIP_COUNT_MINUS_1:%.*]] = sub i64 [[TMP0]], 1
+; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i64> poison, i64 [[TRIP_COUNT_MINUS_1]], i64 0
+; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT]], <4 x i64> poison, <4 x i32> zeroinitializer
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
; CHECK: vector.body:
-; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
+; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE10:%.*]] ]
+; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 1, i64 2, i64 3, i64 4>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[PRED_STORE_CONTINUE10]] ]
; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]]
; CHECK-NEXT: [[TMP13:%.*]] = add i64 [[OFFSET_IDX]], 0
; CHECK-NEXT: [[TMP14:%.*]] = add i64 [[OFFSET_IDX]], 1
; CHECK-NEXT: [[TMP15:%.*]] = add i64 [[OFFSET_IDX]], 2
; CHECK-NEXT: [[TMP16:%.*]] = add i64 [[OFFSET_IDX]], 3
-; CHECK-NEXT: [[TMP17:%.*]] = add nsw i64 [[TMP13]], -1
-; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP17]]
-; CHECK-NEXT: [[TMP19:%.*]] = getelementptr inbounds i32, ptr [[TMP18]], i32 0
-; CHECK-NEXT: store <4 x i32> <i32 65, i32 65, i32 65, i32 65>, ptr [[TMP19]], align 4
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
-; CHECK-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
-; CHECK-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <4 x i64> poison, i64 [[INDEX]], i64 0
+; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <4 x i64> [[BROADCAST_SPLATINSERT3]], <4 x i64> poison, <4 x i32> zeroinitializer
+; CHECK-NEXT: [[VEC_IV:%.*]] = add <4 x i64> [[BROADCAST_SPLAT4]], <i64 0, i64 1, i64 2, i64 3>
+; CHECK-NEXT: [[TMP17:%.*]] = icmp ule <4 x i64> [[VEC_IV]], [[BROADCAST_SPLAT]]
+; CHECK-NEXT: [[TMP18:%.*]] = add nsw <4 x i64> [[VEC_IND]], <i64 -1, i64 -1, i64 -1, i64 -1>
+; CHECK-NEXT: [[TMP19:%.*]] = extractelement <4 x i1> [[TMP17]], i32 0
+; CHECK-NEXT: br i1 [[TMP19]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
+; CHECK: pred.store.if:
+; CHECK-NEXT: [[TMP20:%.*]] = extractelement <4 x i64> [[TMP18]], i32 0
+; CHECK-NEXT: [[TMP21:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP20]]
+; CHECK-NEXT: store i32 65, ptr [[TMP21]], align 4
+; CHECK-NEXT: br label [[PRED_STORE_CONTINUE]]
+; CHECK: pred.store.continue:
+; CHECK-NEXT: [[TMP22:%.*]] = extractelement <4 x i1> [[TMP17]], i32 1
+; CHECK-NEXT: br i1 [[TMP22]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6:%.*]]
+; CHECK: pred.store.if5:
+; CHECK-NEXT: [[TMP23:%.*]] = extractelement <4 x i64> [[TMP18]], i32 1
+; CHECK-NEXT: [[TMP24:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP23]]
+; CHECK-NEXT: store i32 65, ptr [[TMP24]], align 4
+; CHECK-NEXT: br label [[PRED_STORE_CONTINUE6]]
+; CHECK: pred.store.continue6:
+; CHECK-NEXT: [[TMP25:%.*]] = extractelement <4 x i1> [[TMP17]], i32 2
+; CHECK-NEXT: br i1 [[TMP25]], label [[PRED_STORE_IF7:%.*]], label [[PRED_STORE_CONTINUE8:%.*]]
+; CHECK: pred.store.if7:
+; CHECK-NEXT: [[TMP26:%.*]] = extractelement <4 x i64> [[TMP18]], i32 2
+; CHECK-NEXT: [[TMP27:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP26]]
+; CHECK-NEXT: store i32 65, ptr [[TMP27]], align 4
+; CHECK-NEXT: br label [[PRED_STORE_CONTINUE8]]
+; CHECK: pred.store.continue8:
+; CHECK-NEXT: [[TMP28:%.*]] = extractelement <4 x i1> [[TMP17]], i32 3
+; CHECK-NEXT: br i1 [[TMP28]], label [[PRED_STORE_IF9:%.*]], label [[PRED_STORE_CONTINUE10]]
+; CHECK: pred.store.if9:
+; CHECK-NEXT: [[TMP29:%.*]] = extractelement <4 x i64> [[TMP18]], i32 3
+; CHECK-NEXT: [[TMP30:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i64 [[TMP29]]
+; CHECK-NEXT: store i32 65, ptr [[TMP30]], align 4
+; CHECK-NEXT: br label [[PRED_STORE_CONTINUE10]]
+; CHECK: pred.store.continue10:
+; CHECK-NEXT: [[INDEX_NEXT]] = add i64 [[INDEX]], 4
+; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i64> [[VEC_IND]], <i64 4, i64 4, i64 4, i64 4>
+; CHECK-NEXT: [[TMP31:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
+; CHECK-NEXT: br i1 [[TMP31]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: middle.block:
-; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
; CHECK-NEXT: [[CMO:%.*]] = sub i64 [[N_VEC]], 1
; CHECK-NEXT: [[IND_ESCAPE:%.*]] = add i64 1, [[CMO]]
-; CHECK-NEXT: br i1 [[CMP_N]], label [[LOAD_VAL:%.*]], label [[SCALAR_PH]]
+; CHECK-NEXT: br i1 true, label [[LOAD_VAL:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ], [ 1, [[VECTOR_SCEVCHECK]] ]
; CHECK-NEXT: [[BC_RESUME_VAL2:%.*]] = phi i8 [ [[IND_END1]], [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ], [ 1, [[VECTOR_SCEVCHECK]] ]
>From 427d48bde1dd432ba725a715050d8501cb1b1944 Mon Sep 17 00:00:00 2001
From: Niwin Anto <niwinantop at gmail.com>
Date: Wed, 28 Feb 2024 13:51:45 +0100
Subject: [PATCH 3/3] Address feedback. (#4)
* [FIXME] Add test case for tail fold my masking with external users
* Update test failure.
* Address feedback.
---------
Co-authored-by: Niwin Anto <niwin.anto at hightec-rt.com>
---
.../LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
index e4d4d81d4a8cea..9968c933494aa0 100644
--- a/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
+++ b/llvm/test/Transforms/LoopVectorize/no-fold-tail-by-masking-iv-external-uses.ll
@@ -1,11 +1,11 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S | FileCheck %s
-; The vectorizer should refuse to fold the tail by masking because
+; FIXME: The vectorizer should refuse to fold the tail by masking because
; %conv is used outside of the loop. Test for this by checking that
; %n.vec, the vector trip count, is rounded down to the next multiple of
; 4. If folding the tail, it would have been rounded up instead.
-; Test case for #76069.
+; Test case for #76069(https://github.com/llvm/llvm-project/issues/76069).
define i32 @test(ptr %arr, i64 %n) {
; CHECK-LABEL: define i32 @test(
; CHECK-SAME: ptr [[ARR:%.*]], i64 [[N:%.*]]) {
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