1 ; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s 2 3 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 ; A tricky loop: 7 ; 8 ; void loop(int *a, int *b) { 9 ; for (int i = 0; i < 512; ++i) { 10 ; a[a[i]] = b[i]; 11 ; a[i] = b[i+1]; 12 ; } 13 ;} 14 15 ;CHECK-LABEL: @loop( 16 ;CHECK-NOT: <4 x i32> 17 define void @loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable { 18 entry: 19 br label %for.body 20 21 for.body: ; preds = %for.body, %entry 22 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 23 %arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv 24 %0 = load i32, i32* %arrayidx, align 4 25 %arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv 26 %1 = load i32, i32* %arrayidx2, align 4 27 %idxprom3 = sext i32 %1 to i64 28 %arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3 29 store i32 %0, i32* %arrayidx4, align 4 30 %indvars.iv.next = add i64 %indvars.iv, 1 31 %arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next 32 %2 = load i32, i32* %arrayidx6, align 4 33 store i32 %2, i32* %arrayidx2, align 4 34 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 35 %exitcond = icmp eq i32 %lftr.wideiv, 512 36 br i1 %exitcond, label %for.end, label %for.body 37 38 for.end: ; preds = %for.body 39 ret void 40 } 41 42 ; The same loop with parallel loop metadata added to the loop branch 43 ; and the memory instructions. 44 45 ;CHECK-LABEL: @parallel_loop( 46 ;CHECK: <4 x i32> 47 define void @parallel_loop(i32* nocapture %a, i32* nocapture %b) nounwind uwtable { 48 entry: 49 br label %for.body 50 51 for.body: ; preds = %for.body, %entry 52 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 53 %arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv 54 %0 = load i32, i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !3 55 %arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv 56 %1 = load i32, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !3 57 %idxprom3 = sext i32 %1 to i64 58 %arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3 59 ; This store might have originated from inlining a function with a parallel 60 ; loop. Refers to a list with the "original loop reference" (!4) also included. 61 store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !5 62 %indvars.iv.next = add i64 %indvars.iv, 1 63 %arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next 64 %2 = load i32, i32* %arrayidx6, align 4, !llvm.mem.parallel_loop_access !3 65 store i32 %2, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !3 66 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 67 %exitcond = icmp eq i32 %lftr.wideiv, 512 68 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3 69 70 for.end: ; preds = %for.body 71 ret void 72 } 73 74 ; The same loop with an illegal parallel loop metadata: the memory 75 ; accesses refer to a different loop's identifier. 76 77 ;CHECK-LABEL: @mixed_metadata( 78 ;CHECK-NOT: <4 x i32> 79 80 define void @mixed_metadata(i32* nocapture %a, i32* nocapture %b) nounwind uwtable { 81 entry: 82 br label %for.body 83 84 for.body: ; preds = %for.body, %entry 85 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 86 %arrayidx = getelementptr inbounds i32, i32* %b, i64 %indvars.iv 87 %0 = load i32, i32* %arrayidx, align 4, !llvm.mem.parallel_loop_access !6 88 %arrayidx2 = getelementptr inbounds i32, i32* %a, i64 %indvars.iv 89 %1 = load i32, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !6 90 %idxprom3 = sext i32 %1 to i64 91 %arrayidx4 = getelementptr inbounds i32, i32* %a, i64 %idxprom3 92 ; This refers to the loop marked with !7 which we are not in at the moment. 93 ; It should prevent detecting as a parallel loop. 94 store i32 %0, i32* %arrayidx4, align 4, !llvm.mem.parallel_loop_access !7 95 %indvars.iv.next = add i64 %indvars.iv, 1 96 %arrayidx6 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv.next 97 %2 = load i32, i32* %arrayidx6, align 4, !llvm.mem.parallel_loop_access !6 98 store i32 %2, i32* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !6 99 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 100 %exitcond = icmp eq i32 %lftr.wideiv, 512 101 br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !6 102 103 for.end: ; preds = %for.body 104 ret void 105 } 106 107 !3 = !{!3} 108 !4 = !{!4} 109 !5 = !{!3, !4} 110 !6 = !{!6} 111 !7 = !{!7} 112
