1 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true | FileCheck %s
3 ; Tests for unrolling loops with run-time trip counts
5 ; CHECK: unr.cmp{{.*}}:
6 ; CHECK: for.body.unr{{.*}}:
8 ; CHECK: br i1 %exitcond.7, label %for.end.loopexit{{.*}}, label %for.body
10 define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
12 %cmp1 = icmp eq i32 %n, 0
13 br i1 %cmp1, label %for.end, label %for.body
15 for.body: ; preds = %for.body, %entry
16 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
17 %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
18 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
19 %0 = load i32* %arrayidx, align 4
20 %add = add nsw i32 %0, %sum.02
21 %indvars.iv.next = add i64 %indvars.iv, 1
22 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
23 %exitcond = icmp eq i32 %lftr.wideiv, %n
24 br i1 %exitcond, label %for.end, label %for.body
26 for.end: ; preds = %for.body, %entry
27 %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
32 ; Still try to completely unroll loops with compile-time trip counts
33 ; even if the -unroll-runtime is specified
36 ; CHECK-NOT: for.body.unr:
38 define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
42 for.body: ; preds = %for.body, %entry
43 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
44 %sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
45 %arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
46 %0 = load i32* %arrayidx, align 4
47 %add = add nsw i32 %0, %sum.01
48 %indvars.iv.next = add i64 %indvars.iv, 1
49 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
50 %exitcond = icmp eq i32 %lftr.wideiv, 5
51 br i1 %exitcond, label %for.end, label %for.body
53 for.end: ; preds = %for.body
57 ; This is test 2007-05-09-UnknownTripCount.ll which can be unrolled now
58 ; if the -unroll-runtime option is turned on
62 define void @foo(i32 %trips) {
64 br label %cond_true.outer
67 %indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ]
71 %indvar.next2 = add i32 %indvar1.ph, 1
72 %exitcond3 = icmp eq i32 %indvar.next2, %trips
73 br i1 %exitcond3, label %cond_true138, label %cond_true.outer
80 ; Test run-time unrolling for a loop that counts down by -2.
82 ; CHECK: for.body.unr:
83 ; CHECK: br i1 %cmp.7, label %for.cond.for.end_crit_edge{{.*}}, label %for.body
85 define zeroext i16 @down(i16* nocapture %p, i32 %len) nounwind uwtable readonly {
87 %cmp2 = icmp eq i32 %len, 0
88 br i1 %cmp2, label %for.end, label %for.body
90 for.body: ; preds = %for.body, %entry
91 %p.addr.05 = phi i16* [ %incdec.ptr, %for.body ], [ %p, %entry ]
92 %len.addr.04 = phi i32 [ %sub, %for.body ], [ %len, %entry ]
93 %res.03 = phi i32 [ %add, %for.body ], [ 0, %entry ]
94 %incdec.ptr = getelementptr inbounds i16* %p.addr.05, i64 1
95 %0 = load i16* %p.addr.05, align 2
96 %conv = zext i16 %0 to i32
97 %add = add i32 %conv, %res.03
98 %sub = add nsw i32 %len.addr.04, -2
99 %cmp = icmp eq i32 %sub, 0
100 br i1 %cmp, label %for.cond.for.end_crit_edge, label %for.body
102 for.cond.for.end_crit_edge: ; preds = %for.body
103 %phitmp = trunc i32 %add to i16
106 for.end: ; preds = %for.cond.for.end_crit_edge, %entry
107 %res.0.lcssa = phi i16 [ %phitmp, %for.cond.for.end_crit_edge ], [ 0, %entry ]