1; This is the loop in c++ being vectorize in this file with 2; vector.reverse 3 4;#pragma clang loop vectorize_width(4, scalable) 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 -passes=loop-vectorize,dce -mtriple aarch64-linux-gnu -S \ 14; RUN: -prefer-predicate-over-epilogue=scalar-epilogue < %s | FileCheck %s 15 16target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128" 17target triple = "aarch64-unknown-linux-gnu" 18 19define void @vector_reverse_mask_nxv4i1(ptr %a, ptr %cond, i64 %N) #0 { 20; CHECK-LABEL: vector.body: 21; CHECK: %[[REVERSE6:.*]] = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> %{{.*}}) 22; CHECK: %[[WIDEMSKLOAD:.*]] = call <vscale x 4 x double> @llvm.masked.load.nxv4f64.p0(ptr %{{.*}}, i32 8, <vscale x 4 x i1> %[[REVERSE6]], <vscale x 4 x double> poison) 23; CHECK: %[[REVERSE7:.*]] = call <vscale x 4 x double> @llvm.vector.reverse.nxv4f64(<vscale x 4 x double> %[[WIDEMSKLOAD]]) 24; CHECK: %[[FADD:.*]] = fadd <vscale x 4 x double> %[[REVERSE7]] 25; CHECK: %[[REVERSE9:.*]] = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> %{{.*}}) 26; CHECK: %[[REVERSE8:.*]] = call <vscale x 4 x double> @llvm.vector.reverse.nxv4f64(<vscale x 4 x double> %[[FADD]]) 27; CHECK: call void @llvm.masked.store.nxv4f64.p0(<vscale x 4 x double> %[[REVERSE8]], ptr %{{.*}}, i32 8, <vscale x 4 x i1> %[[REVERSE9]] 28 29entry: 30 %cmp7 = icmp sgt i64 %N, 0 31 br i1 %cmp7, label %for.body, label %for.cond.cleanup 32 33for.cond.cleanup: ; preds = %for.cond.cleanup, %entry 34 ret void 35 36for.body: ; preds = %for.body, %entry 37 %i.08.in = phi i64 [ %i.08, %for.inc ], [ %N, %entry ] 38 %i.08 = add nsw i64 %i.08.in, -1 39 %arrayidx = getelementptr inbounds double, ptr %cond, i64 %i.08 40 %0 = load double, ptr %arrayidx, align 8 41 %tobool = fcmp une double %0, 0.000000e+00 42 br i1 %tobool, label %if.then, label %for.inc 43 44if.then: ; preds = %for.body 45 %arrayidx1 = getelementptr inbounds double, ptr %a, i64 %i.08 46 %1 = load double, ptr %arrayidx1, align 8 47 %add = fadd double %1, 1.000000e+00 48 store double %add, ptr %arrayidx1, align 8 49 br label %for.inc 50 51for.inc: ; preds = %for.body, %if.then 52 %cmp = icmp sgt i64 %i.08.in, 1 53 br i1 %cmp, label %for.body, label %for.cond.cleanup, !llvm.loop !0 54} 55 56attributes #0 = {"target-cpu"="generic" "target-features"="+neon,+sve"} 57 58 59!0 = distinct !{!0, !1, !2, !3, !4} 60!1 = !{!"llvm.loop.mustprogress"} 61!2 = !{!"llvm.loop.vectorize.width", i32 4} 62!3 = !{!"llvm.loop.vectorize.scalable.enable", i1 true} 63!4 = !{!"llvm.loop.vectorize.enable", i1 true} 64