[LV] Add ARM MVE tail-folding tests

Now that the vectorizer can do tail-folding (rL367592), and the ARM backend
understands MVE masked loads/stores (rL371932), it's time to add the MVE
tail-folding equivalent of the X86 tests that I added.

llvm-svn: 371996

1 files changed, 89 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/ARM/tail-loop-folding.ll b/llvm/test/Transforms/LoopVectorize/ARM/tail-loop-folding.ll
new file mode 100644
index 00000000000..fc9ef2b3b76
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/ARM/tail-loop-folding.ll
@@ -0,0 +1,89 @@
+; RUN: opt < %s -loop-vectorize -enable-arm-maskedldst -S | \
+; RUN:  FileCheck %s -check-prefixes=COMMON,CHECK
+
+; RUN: opt < %s -loop-vectorize -enable-arm-maskedldst -prefer-predicate-over-epilog -S | \
+; RUN:   FileCheck -check-prefixes=COMMON,PREDFLAG %s
+
+target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "thumbv8.1m.main-arm-unknown-eabihf"
+
+define dso_local void @tail_folding_enabled(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i32* noalias nocapture readonly %C) local_unnamed_addr #0 {
+; COMMON-LABEL: tail_folding_enabled(
+; COMMON: vector.body:
+; COMMON:   %[[WML1:.*]] = call <4 x i32> @llvm.masked.load.v4i32.p0v4i32(
+; COMMON:   %[[WML2:.*]] = call <4 x i32> @llvm.masked.load.v4i32.p0v4i32(
+; COMMON:   %[[ADD:.*]] = add nsw <4 x i32> %[[WML2]], %[[WML1]]
+; COMMON:   call void @llvm.masked.store.v4i32.p0v4i32(<4 x i32> %[[ADD]]
+; COMMON:   br i1 %12, label %{{.*}}, label %vector.body
+entry:
+  br label %for.body
+
+for.cond.cleanup:
+  ret void
+
+for.body:
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %arrayidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
+  %0 = load i32, i32* %arrayidx, align 4
+  %arrayidx2 = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
+  %1 = load i32, i32* %arrayidx2, align 4
+  %add = add nsw i32 %1, %0
+  %arrayidx4 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
+  store i32 %add, i32* %arrayidx4, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 430
+  br i1 %exitcond, label %for.cond.cleanup, label %for.body, !llvm.loop !6
+}
+
+define dso_local void @tail_folding_disabled(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i32* noalias nocapture readonly %C) local_unnamed_addr #0 {
+; CHECK-LABEL: tail_folding_disabled(
+; CHECK:      vector.body:
+; CHECK-NOT:  @llvm.masked.load.v8i32.p0v8i32(
+; CHECK-NOT:  @llvm.masked.store.v8i32.p0v8i32(
+; CHECK:      br i1 %{{.*}}, label {{.*}}, label %vector.body
+
+; PREDFLAG-LABEL: tail_folding_disabled(
+; PREDFLAG:  vector.body:
+; PREDFLAG:  %wide.masked.load = call <4 x i32> @llvm.masked.load.v4i32.p0v4i32(
+; PREDFLAG:  %wide.masked.load1 = call <4 x i32> @llvm.masked.load.v4i32.p0v4i32(
+; PREDFLAG:  %{{.*}} = add nsw <4 x i32> %wide.masked.load1, %wide.masked.load
+; PREDFLAG:  call void @llvm.masked.store.v4i32.p0v4i32(
+; PREDFLAG:  %index.next = add i64 %index, 4
+; PREDFLAG:  %12 = icmp eq i64 %index.next, 432
+; PREDFLAG:  br i1 %12, label %middle.block, label %vector.body, !llvm.loop !4
+entry:
+  br label %for.body
+
+for.cond.cleanup:
+  ret void
+
+for.body:
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %arrayidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
+  %0 = load i32, i32* %arrayidx, align 4
+  %arrayidx2 = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
+  %1 = load i32, i32* %arrayidx2, align 4
+  %add = add nsw i32 %1, %0
+  %arrayidx4 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
+  store i32 %add, i32* %arrayidx4, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 430
+  br i1 %exitcond, label %for.cond.cleanup, label %for.body, !llvm.loop !10
+}
+
+; CHECK:      !0 = distinct !{!0, !1}
+; CHECK-NEXT: !1 = !{!"llvm.loop.isvectorized", i32 1}
+; CHECK-NEXT: !2 = distinct !{!2, !3, !1}
+; CHECK-NEXT: !3 = !{!"llvm.loop.unroll.runtime.disable"}
+; CHECK-NEXT: !4 = distinct !{!4, !1}
+; CHECK-NEXT: !5 = distinct !{!5, !3, !1}
+
+attributes #0 = { nofree norecurse nounwind "target-features"="+armv8.1-m.main,+mve.fp" }
+
+!6 = distinct !{!6, !7, !8}
+!7 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
+!8 = !{!"llvm.loop.vectorize.enable", i1 true}
+
+!10 = distinct !{!10, !11, !12}
+!11 = !{!"llvm.loop.vectorize.predicate.enable", i1 false}
+!12 = !{!"llvm.loop.vectorize.enable", i1 true}