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: %lcmp.overflow = icmp eq i32 %n, 0
8 ; CHECK: %lcmp.or = or i1 %lcmp.overflow, %lcmp.mod
9 ; CHECK: br i1 %lcmp.or, label %unr.cmp
11 ; CHECK: unr.cmp{{.*}}:
12 ; CHECK: for.body.unr{{.*}}:
14 ; CHECK: br i1 %exitcond.7, label %for.end.loopexit{{.*}}, label %for.body
16 define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
18 %cmp1 = icmp eq i32 %n, 0
19 br i1 %cmp1, label %for.end, label %for.body
21 for.body: ; preds = %for.body, %entry
22 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
23 %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
24 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
25 %0 = load i32* %arrayidx, align 4
26 %add = add nsw i32 %0, %sum.02
27 %indvars.iv.next = add i64 %indvars.iv, 1
28 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
29 %exitcond = icmp eq i32 %lftr.wideiv, %n
30 br i1 %exitcond, label %for.end, label %for.body
32 for.end: ; preds = %for.body, %entry
33 %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
38 ; Still try to completely unroll loops with compile-time trip counts
39 ; even if the -unroll-runtime is specified
42 ; CHECK-NOT: for.body.unr:
44 define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
48 for.body: ; preds = %for.body, %entry
49 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
50 %sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
51 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
52 %0 = load i32* %arrayidx, align 4
53 %add = add nsw i32 %0, %sum.01
54 %indvars.iv.next = add i64 %indvars.iv, 1
55 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
56 %exitcond = icmp eq i32 %lftr.wideiv, 5
57 br i1 %exitcond, label %for.end, label %for.body
59 for.end: ; preds = %for.body
63 ; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now
64 ; if the -unroll-runtime option is turned on
68 define void @foo(i32 %trips) {
70 br label %cond_true.outer
73 %indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ]
77 %indvar.next2 = add i32 %indvar1.ph, 1
78 %exitcond3 = icmp eq i32 %indvar.next2, %trips
79 br i1 %exitcond3, label %cond_true138, label %cond_true.outer
86 ; Test run-time unrolling for a loop that counts down by -2.
88 ; CHECK: for.body.unr:
89 ; CHECK: br i1 %cmp.7, label %for.cond.for.end_crit_edge{{.*}}, label %for.body
91 define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
93 %cmp2 = icmp eq i32 %len, 0
94 br i1 %cmp2, label %for.end, label %for.body
96 for.body: ; preds = %for.body, %entry
97 %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %entry ]
98 %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %entry ]
99 %res.03 = phi i32 [ %add, %for.body ], [ 0, %entry ]
100 %incdec.ptr = getelementptr inbounds i16* %p.addr.05, i64 1
101 %0 = load i16* %p.addr.05, align 2
102 %conv = zext i16 %0 to i32
103 %add = add i32 %conv, %res.03
104 %sub = add nsw i32 %len.addr.04, -2
105 %cmp = icmp eq i32 %sub, 0
106 br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body
108 for.cond.for.end_crit_edge: ; preds = %for.body
109 %phitmp = trunc i32 %add to i16
112 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
113 %res.0.lcssa = phi i16 [ %phitmp, %for.cond.for.end_crit_edge ], [ 0, %entry ]