1; This is the loop in c++ being vectorize in this file with
2; shuffle reverse
3
4;#pragma clang loop vectorize_width(4, fixed)
5;  for (long int i = N - 1; i >= 0; i--)
6;  {
7;    if (cond[i])
8;      a[i] += 1;
9;  }
10
11; The test checks if the mask is being correctly created, reverted  and used
12
13; RUN: opt -loop-vectorize -dce -instcombine -mtriple aarch64-linux-gnu -S < %s | FileCheck %s
14
15target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
16target triple = "aarch64-unknown-linux-gnu"
17
18define void @vector_reverse_mask_v4i1(double* %a, double* %cond, i64 %N) #0 {
19; CHECK-LABEL: vector.body:
20; CHECK: %[[REVERSE6:.*]] = shufflevector <4 x i1> %{{.*}}, <4 x i1> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
21; CHECK: %[[WIDEMSKLOAD:.*]] = call <4 x double> @llvm.masked.load.v4f64.p0v4f64(<4 x double>* nonnull %{{.*}}, i32 8, <4 x i1> %[[REVERSE6]], <4 x double> poison)
22; CHECK-NEXT: %[[FADD:.*]] = fadd <4 x double> %[[WIDEMSKLOAD]]
23; CHECK: call void @llvm.masked.store.v4f64.p0v4f64(<4 x double> %[[FADD]], <4 x double>* %{{.*}}, i32 8, <4 x i1> %[[REVERSE6]])
24
25entry:
26  %cmp7 = icmp sgt i64 %N, 0
27  br i1 %cmp7, label %for.body, label %for.cond.cleanup
28
29for.cond.cleanup:                                 ; preds = %for.cond.cleanup, %entry
30  ret void
31
32for.body:                                         ; preds = %for.body, %entry
33  %i.08.in = phi i64 [ %i.08, %for.inc ], [ %N, %entry ]
34  %i.08 = add nsw i64 %i.08.in, -1
35  %arrayidx = getelementptr inbounds double, double* %cond, i64 %i.08
36  %0 = load double, double* %arrayidx, align 8
37  %tobool = fcmp une double %0, 0.000000e+00
38  br i1 %tobool, label %if.then, label %for.inc
39
40if.then:                                          ; preds = %for.body
41  %arrayidx1 = getelementptr inbounds double, double* %a, i64 %i.08
42  %1 = load double, double* %arrayidx1, align 8
43  %add = fadd double %1, 1.000000e+00
44  store double %add, double* %arrayidx1, align 8
45  br label %for.inc
46
47for.inc:                                          ; preds = %for.body, %if.then
48  %cmp = icmp sgt i64 %i.08.in, 1
49  br i1 %cmp, label %for.body, label %for.cond.cleanup, !llvm.loop !0
50}
51
52attributes #0 = {"target-cpu"="generic" "target-features"="+neon,+sve"}
53
54
55!0 = distinct !{!0, !1, !2, !3, !4}
56!1 = !{!"llvm.loop.mustprogress"}
57!2 = !{!"llvm.loop.vectorize.width", i32 4}
58!3 = !{!"llvm.loop.vectorize.scalable.enable", i1 false}
59!4 = !{!"llvm.loop.vectorize.enable", i1 true}
60