1 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=4 -unroll-remainder -instcombine | FileCheck %s
4 define i32 @unroll(i32* nocapture readonly %a, i32* nocapture readonly %b, i32 %N) local_unnamed_addr #0 {
6 %cmp9 = icmp eq i32 %N, 0
7 br i1 %cmp9, label %for.cond.cleanup, label %for.body.lr.ph
10 %wide.trip.count = zext i32 %N to i64
14 %c.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
17 ; CHECK-LABEL: for.body.lr.ph
18 ; CHECK: [[COUNT:%[a-z.0-9]+]] = add nsw i64 %wide.trip.count, -1
19 ; CHECK: %xtraiter = and i64 %wide.trip.count, 3
20 ; CHECK: [[CMP:%[a-z.0-9]+]] = icmp ult i64 [[COUNT]], 3
21 ; CHECK: br i1 [[CMP]], label %[[CLEANUP:.*]], label %for.body.lr.ph.new
23 ; CHECK-LABEL: for.body.lr.ph.new:
24 ; CHECK: %unroll_iter = sub nsw i64 %wide.trip.count, %xtraiter
25 ; CHECK: br label %for.body
28 ; CHECK: [[MOD:%[a-z.0-9]+]] = icmp eq i64 %xtraiter, 0
29 ; CHECK: br i1 [[MOD]], label %[[EXIT:.*]], label %[[EPIL_PEEL0_PRE:.*]]
31 ; CHECK: [[EPIL_PEEL0_PRE]]:
32 ; CHECK: br label %[[EPIL_PEEL0:.*]]
34 ; CHECK: [[EPIL_PEEL0]]:
35 ; CHECK: [[PEEL_CMP0:%[a-z.0-9]+]] = icmp eq i64 %xtraiter, 1
36 ; CHECK: br i1 [[PEEL_CMP0]], label %[[EPIL_EXIT:.*]], label %[[EPIL_PEEL1:.*]]
38 ; CHECK: [[EPIL_EXIT]]:
39 ; CHECK: br label %[[EXIT]]
44 ; CHECK-LABEL: for.body:
45 ; CHECK: [[INDVAR0:%[a-z.0-9]+]] = phi i64 [ 0, %for.body.lr.ph
46 ; CHECK: [[ITER:%[a-z.0-9]+]] = phi i64 [ %unroll_iter
47 ; CHECK: or i64 [[INDVAR0]], 1
48 ; CHECK: or i64 [[INDVAR0]], 2
49 ; CHECK: or i64 [[INDVAR0]], 3
50 ; CHECK: add nuw nsw i64 [[INDVAR0]], 4
51 ; CHECK: [[SUB:%[a-z.0-9]+]] = add i64 [[ITER]], -4
52 ; CHECK: [[ITER_CMP:%[a-z.0-9]+]] = icmp eq i64 [[SUB]], 0
53 ; CHECK: br i1 [[ITER_CMP]], label %[[LOOP_EXIT:.*]], label %for.body
55 ; CHECK: [[EPIL_PEEL1]]:
56 ; CHECK: [[PEEL_CMP1:%[a-z.0-9]+]] = icmp eq i64 %xtraiter, 2
57 ; CHECK: br i1 [[PEEL_CMP1]], label %[[EPIL_EXIT]], label %[[EPIL_PEEL2:.*]]
59 ; CHECK: [[EPIL_PEEL2]]:
60 ; CHECK: br label %[[EXIT]]
63 %indvars.iv = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next, %for.body ]
64 %c.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add, %for.body ]
65 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
66 %0 = load i32, i32* %arrayidx, align 4
67 %arrayidx2 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
68 %1 = load i32, i32* %arrayidx2, align 4
69 %mul = mul nsw i32 %1, %0
70 %add = add nsw i32 %mul, %c.010
71 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
72 %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
73 br i1 %exitcond, label %for.cond.cleanup, label %for.body