xref: /llvm-project/polly/test/CodeGen/single_loop_zero_iterations.ll (revision e1f056f692d869708c1898d9d65a69ac5584a0ed)
1; RUN: opt %loadNPMPolly '-passes=print<polly-ast>' -disable-output < %s | FileCheck %s -check-prefix=SCALAR --allow-empty
2
3;#define N 20
4;
5;int main () {
6;  int i;
7;  int A[N];
8;
9;  A[0] = 0;
10;
11;  __sync_synchronize();
12;
13;  for (i = 0; i < 0; i++)
14;    A[i] = 1;
15;
16;  __sync_synchronize();
17;
18;  if (A[0] == 0)
19;    return 0;
20;  else
21;    return 1;
22;}
23
24target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
25
26define i32 @main() nounwind {
27entry:
28  %A = alloca [20 x i32], align 4                 ; <ptr> [#uses=3]
29  %arraydecay = getelementptr inbounds [20 x i32], ptr %A, i32 0, i32 0 ; <ptr> [#uses=1]
30  %arrayidx = getelementptr inbounds i32, ptr %arraydecay, i64 0 ; <ptr> [#uses=1]
31  store i32 0, ptr %arrayidx
32  fence seq_cst
33  br label %for.cond
34
35for.cond:                                         ; preds = %for.inc, %entry
36  %indvar = phi i64 [ %indvar.next, %for.inc ], [ 0, %entry ] ; <i64> [#uses=2]
37  %arrayidx3 = getelementptr [20 x i32], ptr %A, i64 0, i64 %indvar ; <ptr> [#uses=1]
38  br i1 false, label %for.body, label %for.end
39
40for.body:                                         ; preds = %for.cond
41  store i32 1, ptr %arrayidx3
42  br label %for.inc
43
44for.inc:                                          ; preds = %for.body
45  %indvar.next = add i64 %indvar, 1               ; <i64> [#uses=1]
46  br label %for.cond
47
48for.end:                                          ; preds = %for.cond
49  fence seq_cst
50  %arraydecay5 = getelementptr inbounds [20 x i32], ptr %A, i32 0, i32 0 ; <ptr> [#uses=1]
51  %arrayidx6 = getelementptr inbounds i32, ptr %arraydecay5, i64 0 ; <ptr> [#uses=1]
52  %tmp7 = load i32, ptr %arrayidx6                    ; <i32> [#uses=1]
53  %cmp8 = icmp eq i32 %tmp7, 0                    ; <i1> [#uses=1]
54  br i1 %cmp8, label %if.then, label %if.else
55
56if.then:                                          ; preds = %for.end
57  br label %return
58
59if.else:                                          ; preds = %for.end
60  br label %return
61
62return:                                           ; preds = %if.else, %if.then
63  %retval.0 = phi i32 [ 0, %if.then ], [ 1, %if.else ] ; <i32> [#uses=1]
64  ret i32 %retval.0
65}
66
67; SCALAR-NOT:   Stmt_for_body(0);
68