1; RUN: llc -march=amdgcn -mcpu=verde < %s | FileCheck %s
2
3; Test a simple uniform loop that lives inside non-uniform control flow.
4
5; CHECK-LABEL: {{^}}test1:
6; CHECK: v_cmp_ne_i32_e32 vcc, 0
7; CHECK: s_and_saveexec_b64
8
9; CHECK: [[LOOP_BODY_LABEL:BB[0-9]+_[0-9]+]]:
10; CHECK: s_and_b64 vcc, exec, vcc
11; CHECK: s_cbranch_vccz [[LOOP_BODY_LABEL]]
12
13; CHECK: s_endpgm
14define amdgpu_ps void @test1(<8 x i32> inreg %rsrc, <2 x i32> %addr.base, i32 %y, i32 %p) {
15main_body:
16  %cc = icmp eq i32 %p, 0
17  br i1 %cc, label %out, label %loop_body
18
19loop_body:
20  %counter = phi i32 [ 0, %main_body ], [ %incr, %loop_body ]
21
22  ; Prevent the loop from being optimized out
23  call void asm sideeffect "", "" ()
24
25  %incr = add i32 %counter, 1
26  %lc = icmp sge i32 %incr, 1000
27  br i1 %lc, label %out, label %loop_body
28
29out:
30  ret void
31}
32
33;CHECK-LABEL: {{^}}test2:
34;CHECK: s_and_saveexec_b64
35;CHECK: s_xor_b64
36;CHECK-NEXT: s_cbranch_execz
37define void @test2(i32 addrspace(1)* %out, i32 %a, i32 %b) {
38main_body:
39  %tid = call i32 @llvm.amdgcn.workitem.id.x() #1
40  %cc = icmp eq i32 %tid, 0
41  br i1 %cc, label %done1, label %if
42
43if:
44  %cmp = icmp eq i32 %a, 0
45  br i1 %cmp, label %done0, label %loop_body
46
47loop_body:
48  %counter = phi i32 [ 0, %if ], [0, %done0], [ %incr, %loop_body ]
49
50  ; Prevent the loop from being optimized out
51  call void asm sideeffect "", "" ()
52
53  %incr = add i32 %counter, 1
54  %lc = icmp sge i32 %incr, 1000
55  br i1 %lc, label %done1, label %loop_body
56
57done0:
58  %cmp0 = icmp eq i32 %b, 0
59  br i1 %cmp0, label %done1, label %loop_body
60
61done1:
62  ret void
63}
64
65declare i32 @llvm.amdgcn.workitem.id.x() #1
66
67attributes #1 = { nounwind readonly }
68