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1; RUN: opt < %s -gvn -S | FileCheck %s
2
3target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
4
5@p = external global i32
6
7define i32 @test(i32 %n) nounwind {
8; CHECK: @test
9entry:
10  br label %for.cond
11
12; loads aligned greater than the memory should not be moved past conditionals
13; CHECK-NOT: load
14; CHECK: br i1
15
16for.cond:
17  %i.0 = phi i32 [ 0, %entry ], [ %indvar.next, %for.inc ]
18  %cmp = icmp slt i32 %i.0, %n
19  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
20
21for.cond.for.end_crit_edge:
22; ...but PRE can still move the load out of for.end to here.
23; CHECK: for.cond.for.end_crit_edge:
24; CHECK-NEXT: load
25  br label %for.end
26
27for.body:
28  %tmp3 = load i32* @p, align 8
29  %dec = add i32 %tmp3, -1
30  store i32 %dec, i32* @p
31  %cmp6 = icmp slt i32 %dec, 0
32  br i1 %cmp6, label %for.body.for.end_crit_edge, label %for.inc
33
34for.body.for.end_crit_edge:
35  br label %for.end
36
37for.inc:
38  %indvar.next = add i32 %i.0, 1
39  br label %for.cond
40
41for.end:
42  %tmp9 = load i32* @p, align 8
43  ret i32 %tmp9
44}
45