xref: /llvm-project/polly/test/DeLICM/load-in-cond-inf-loop.ll (revision 5aafc6d58f3405662902cee006be11e599801b88)
1; RUN: opt %loadNPMPolly '-passes=print<polly-delicm>' -disable-output < %s | FileCheck %s
2
3; When %b is 0, %for.body13 is an infinite loop. In this case the loaded
4; value %1 is not used anywhere.
5; This is a problem when DeLICM tries to map %1 to %arrayidx16 because
6; %1 has no corresponding when %b == 0 and therefore hat no location
7; where it can be mapped to. However, since %b == 0 results in an
8; infinite loop, it should not in the Context, or in this case, in the
9; InvalidContext.
10;
11; Test case reduced from llvm.org/PR48445.
12
13target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
14
15@arr_18 = external dso_local local_unnamed_addr global [0 x i16], align 2
16
17define void @func(i64 %b, ptr %c) {
18entry:
19  %conv1 = trunc i64 %b to i32
20  %sext = shl i32 %conv1, 24
21  %conv2 = ashr exact i32 %sext, 24
22  %arrayidx = getelementptr inbounds i8, ptr %c, i64 %b
23  %tobool19.not = icmp eq i64 %b, 0
24  br label %for.cond3.preheader
25
26for.cond3.preheader:
27  %d.039 = phi i16 [ 0, %entry ], [ %inc, %for.cond.cleanup6 ]
28  %idxprom = sext i16 %d.039 to i64
29  br label %for.cond8.preheader
30
31for.cond8.preheader:
32  br label %for.body13
33
34for.cond.cleanup6:
35  %arrayidx16 = getelementptr inbounds [0 x i16], ptr @arr_18, i64 0, i64 %idxprom
36  %0 = zext i8 %1 to i16
37  store i16 %0, ptr %arrayidx16, align 2
38  %inc = add i16 %d.039, 1
39  %conv = sext i16 %inc to i32
40  %cmp = icmp sgt i32 %conv2, %conv
41  br i1 %cmp, label %for.cond3.preheader, label %for.cond.cleanup
42
43for.cond.cleanup12:
44  br i1 false, label %for.cond8.preheader, label %for.cond.cleanup6
45
46for.body13:
47  %1 = load i8, ptr %arrayidx, align 1
48  br i1 %tobool19.not, label %for.body13, label %for.cond.cleanup12
49
50for.cond.cleanup:
51  ret void
52}
53
54
55; CHECK: Statistics {
56; CHECK:     Value scalars mapped:  1
57; CHECK: }
58; CHECK:      After accesses {
59; CHECK-NEXT:     Stmt_for_body13
60; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 0]
61; CHECK-NEXT:                 [b] -> { Stmt_for_body13[i0, i1, i2] -> MemRef_c[b] };
62; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 1]
63; CHECK-NEXT:                 [b] -> { Stmt_for_body13[i0, i1, i2] -> MemRef1[] };
64; CHECK-NEXT:            new: [b] -> { Stmt_for_body13[i0, i1, i2] -> MemRef_arr_18[i0] : i0 < b; Stmt_for_body13[0, i1, i2] -> MemRef_arr_18[0] : b < 0 };
65; CHECK-NEXT:     Stmt_for_cond_cleanup6
66; CHECK-NEXT:             ReadAccess :=       [Reduction Type: NONE] [Scalar: 1]
67; CHECK-NEXT:                 [b] -> { Stmt_for_cond_cleanup6[i0] -> MemRef1[] };
68; CHECK-NEXT:            new: [b] -> { Stmt_for_cond_cleanup6[i0] -> MemRef_arr_18[i0] : i0 < b; Stmt_for_cond_cleanup6[0] -> MemRef_arr_18[0] : b < 0 };
69; CHECK-NEXT:             MustWriteAccess :=  [Reduction Type: NONE] [Scalar: 0]
70; CHECK-NEXT:                 [b] -> { Stmt_for_cond_cleanup6[i0] -> MemRef_arr_18[i0] };
71; CHECK-NEXT: }
72