1 ; RUN: opt < %s -disable-loop-unrolling -debug-only=loop-vectorize -O3 -S 2>&1 | FileCheck %s 2 ; REQUIRES: asserts 3 ; We want to make sure that we don't even try to vectorize loops again 4 ; The vectorizer used to mark the un-vectorized loop only as already vectorized 5 ; thus, trying to vectorize the vectorized loop again 6 7 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" 8 target triple = "x86_64-unknown-linux-gnu" 9 10 @a = external global [255 x i32] 11 12 ; Function Attrs: nounwind readonly uwtable 13 define i32 @vect() { 14 ; CHECK: LV: Checking a loop in "vect" 15 entry: 16 br label %for.body 17 18 for.body: ; preds = %for.body, %entry 19 ; We need to make sure we did vectorize the loop 20 ; CHECK: LV: Found a loop: for.body 21 ; CHECK: LV: We can vectorize this loop! 22 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 23 %red.05 = phi i32 [ 0, %entry ], [ %add, %for.body ] 24 %arrayidx = getelementptr inbounds [255 x i32], [255 x i32]* @a, i64 0, i64 %indvars.iv 25 %0 = load i32, i32* %arrayidx, align 4 26 %add = add nsw i32 %0, %red.05 27 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 28 %exitcond = icmp eq i64 %indvars.iv.next, 255 29 br i1 %exitcond, label %for.end, label %for.body 30 31 ; If it did, we have two loops: 32 ; CHECK: vector.body: 33 ; CHECK: br {{.*}} label %vector.body, !llvm.loop [[vect:![0-9]+]] 34 ; CHECK: for.body: 35 ; CHECK: br {{.*}} label %for.body, !llvm.loop [[scalar:![0-9]+]] 36 37 for.end: ; preds = %for.body 38 ret i32 %add 39 } 40 41 ; Now, we check for the Hint metadata 42 ; CHECK: [[vect]] = distinct !{[[vect]], [[width:![0-9]+]], [[unroll:![0-9]+]]} 43 ; CHECK: [[width]] = !{!"llvm.loop.vectorize.width", i32 1} 44 ; CHECK: [[unroll]] = !{!"llvm.loop.interleave.count", i32 1} 45 ; CHECK: [[scalar]] = distinct !{[[scalar]], [[runtime_unroll:![0-9]+]], [[width]], [[unroll]]} 46 ; CHECK: [[runtime_unroll]] = !{!"llvm.loop.unroll.runtime.disable"} 47 48
