xref: /llvm-project/llvm/test/Transforms/HardwareLoops/unscevable.ll (revision 2a58be42396376e8d552158ff801d953c6c1bee3) 
1; RUN: opt -passes=hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -S %s -o - | FileCheck %s
2; RUN: opt -passes=hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-hardware-loop-phi=true -S %s -o - | FileCheck %s
3; RUN: opt -passes=hardware-loops -force-hardware-loops=true -hardware-loop-decrement=1 -hardware-loop-counter-bitwidth=32 -force-nested-hardware-loop=true -S %s -o - | FileCheck %s
4
5; CHECK-LABEL: float_counter
6; CHECK-NOT: set.loop.iterations
7; CHECK-NOT: loop.decrement
8define void @float_counter(ptr nocapture %A, float %N) {
9entry:
10  %cmp6 = fcmp ogt float %N, 0.000000e+00
11  br i1 %cmp6, label %while.body, label %while.end
12
13while.body:
14  %i.07 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
15  %arrayidx = getelementptr inbounds i32, ptr %A, i32 %i.07
16  store i32 %i.07, ptr %arrayidx, align 4
17  %inc = add i32 %i.07, 1
18  %conv = uitofp i32 %inc to float
19  %cmp = fcmp olt float %conv, %N
20  br i1 %cmp, label %while.body, label %while.end
21
22while.end:
23  ret void
24}
25
26; CHECK-LABEL: variant_counter
27; CHECK-NOT: set.loop.iterations
28; CHECK-NOT: loop.decrement
29define void @variant_counter(ptr nocapture %A, ptr nocapture readonly %B) {
30entry:
31  %0 = load i32, ptr %B, align 4
32  %cmp7 = icmp eq i32 %0, 0
33  br i1 %cmp7, label %while.end, label %while.body
34
35while.body:
36  %i.08 = phi i32 [ %inc, %while.body ], [ 0, %entry ]
37  %arrayidx1 = getelementptr inbounds i32, ptr %A, i32 %i.08
38  store i32 %i.08, ptr %arrayidx1, align 4
39  %inc = add nuw i32 %i.08, 1
40  %arrayidx = getelementptr inbounds i32, ptr %B, i32 %inc
41  %1 = load i32, ptr %arrayidx, align 4
42  %cmp = icmp ult i32 %inc, %1
43  br i1 %cmp, label %while.body, label %while.end
44
45while.end:
46  ret void
47}
48
49; CHECK-LABEL: variant_counter2
50; CHECK-NOT: set.loop.iterations
51; CHECK-NOT: loop.decrement
52define void @variant_counter2(ptr, ptr, ptr) {
53  %4 = icmp eq ptr %0, %1
54  br i1 %4, label %9, label %5
55
565:                                                ; preds = %3
57  %6 = getelementptr inbounds i64, ptr %2, i64 1
58  %7 = load i64, ptr %6, align 8
59  br label %10
60
618:                                                ; preds = %10
62  store i64 %14, ptr %6, align 8
63  br label %9
64
659:                                                ; preds = %8, %3
66  ret void
67
6810:                                               ; preds = %5, %10
69  %11 = phi i64 [ %7, %5 ], [ %14, %10 ]
70  %12 = phi i32 [ 0, %5 ], [ %15, %10 ]
71  %13 = phi ptr [ %0, %5 ], [ %16, %10 ]
72  %14 = shl nsw i64 %11, 4
73  %15 = add nuw nsw i32 %12, 1
74  %16 = getelementptr inbounds i8, ptr %13, i64 1
75  %17 = icmp ugt i32 %12, 14
76  %18 = icmp eq ptr %16, %1
77  %19 = or i1 %18, %17
78  br i1 %19, label %8, label %10
79}
80