1 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s
3 ; Tests for unrolling loops with run-time trip counts
5 ; CHECK: %xtraiter = and i32 %n
6 ; CHECK: %lcmp.mod = icmp ne i32 %xtraiter, 0
7 ; CHECK: br i1 %lcmp.mod, label %for.body.prol, label %for.body.preheader.split
9 ; CHECK: for.body.prol:
10 ; CHECK: %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %for.body.prol ], [ 0, %for.body.preheader ]
11 ; CHECK: %prol.iter.sub = sub i32 %prol.iter, 1
12 ; CHECK: %prol.iter.cmp = icmp ne i32 %prol.iter.sub, 0
13 ; CHECK: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split, !llvm.loop !0
15 define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
17 %cmp1 = icmp eq i32 %n, 0
18 br i1 %cmp1, label %for.end, label %for.body
20 for.body: ; preds = %for.body, %entry
21 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
22 %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
23 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
24 %0 = load i32* %arrayidx, align 4
25 %add = add nsw i32 %0, %sum.02
26 %indvars.iv.next = add i64 %indvars.iv, 1
27 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
28 %exitcond = icmp eq i32 %lftr.wideiv, %n
29 br i1 %exitcond, label %for.end, label %for.body
31 for.end: ; preds = %for.body, %entry
32 %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
37 ; Still try to completely unroll loops with compile-time trip counts
38 ; even if the -unroll-runtime is specified
41 ; CHECK-NOT: for.body.prol:
43 define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
47 for.body: ; preds = %for.body, %entry
48 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
49 %sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
50 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
51 %0 = load i32* %arrayidx, align 4
52 %add = add nsw i32 %0, %sum.01
53 %indvars.iv.next = add i64 %indvars.iv, 1
54 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
55 %exitcond = icmp eq i32 %lftr.wideiv, 5
56 br i1 %exitcond, label %for.end, label %for.body
58 for.end: ; preds = %for.body
62 ; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now
63 ; if the -unroll-runtime option is turned on
67 define void @foo(i32 %trips) {
69 br label %cond_true.outer
72 %indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ]
76 %indvar.next2 = add i32 %indvar1.ph, 1
77 %exitcond3 = icmp eq i32 %indvar.next2, %trips
78 br i1 %exitcond3, label %cond_true138, label %cond_true.outer
85 ; Test run-time unrolling for a loop that counts down by -2.
87 ; CHECK: for.body.prol:
88 ; CHECK: br i1 %prol.iter.cmp, label %for.body.prol, label %for.body.preheader.split
90 define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
92 %cmp2 = icmp eq i32 %len, 0
93 br i1 %cmp2, label %for.end, label %for.body
95 for.body: ; preds = %for.body, %entry
96 %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %entry ]
97 %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %entry ]
98 %res.03 = phi i32 [ %add, %for.body ], [ 0, %entry ]
99 %incdec.ptr = getelementptr inbounds i16* %p.addr.05, i64 1
100 %0 = load i16* %p.addr.05, align 2
101 %conv = zext i16 %0 to i32
102 %add = add i32 %conv, %res.03
103 %sub = add nsw i32 %len.addr.04, -2
104 %cmp = icmp eq i32 %sub, 0
105 br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body
107 for.cond.for.end_crit_edge: ; preds = %for.body
108 %phitmp = trunc i32 %add to i16
111 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
112 %res.0.lcssa = phi i16 [ %phitmp, %for.cond.for.end_crit_edge ], [ 0, %entry ]
116 ; CHECK: !0 = distinct !{!0, !1}
117 ; CHECK: !1 = !{!"llvm.loop.unroll.disable"}