1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
; RUN: opt -S -mtriple=amdgcn-- -amdgpu-replace-lds-use-with-pointer -amdgpu-enable-lds-replace-with-pointer=true < %s | FileCheck %s
; DESCRIPTION:
;
; The lds global @lds_used_within_func is used within non-kernel function @func_uses_lds
; which is *indirectly* recheable from kernel @kernel_reaches_lds, hence pointer replacement
; takes place for @lds_used_within_func.
; Original LDS should exit.
; CHECK: @lds_used_within_func = internal addrspace(3) global [4 x i32] undef, align 4
@lds_used_within_func = internal addrspace(3) global [4 x i32] undef, align 4
; Function pointer should exist as it is.
; CHECK: @ptr_to_func = internal local_unnamed_addr externally_initialized global void ()* @func_uses_lds, align 8
@ptr_to_func = internal local_unnamed_addr externally_initialized global void ()* @func_uses_lds, align 8
; Pointer should be created.
; CHECK: @lds_used_within_func.ptr = internal unnamed_addr addrspace(3) global i16 undef, align 2
; Pointer replacement code should be added.
define internal void @func_uses_lds() {
; CHECK-LABEL: entry:
; CHECK: %0 = load i16, i16 addrspace(3)* @lds_used_within_func.ptr, align 2
; CHECK: %1 = getelementptr i8, i8 addrspace(3)* null, i16 %0
; CHECK: %2 = bitcast i8 addrspace(3)* %1 to [4 x i32] addrspace(3)*
; CHECK: %gep = getelementptr inbounds [4 x i32], [4 x i32] addrspace(3)* %2, i32 0, i32 0
; CHECK: ret void
entry:
%gep = getelementptr inbounds [4 x i32], [4 x i32] addrspace(3)* @lds_used_within_func, i32 0, i32 0
ret void
}
; No change
define internal void @func_does_not_use_lds_3() {
; CHECK-LABEL: entry:
; CHECK: %fptr = load void ()*, void ()** @ptr_to_func, align 8
; CHECK: call void %fptr()
; CHECK: ret void
entry:
%fptr = load void ()*, void ()** @ptr_to_func, align 8
call void %fptr()
ret void
}
; No change
define internal void @func_does_not_use_lds_2() {
; CHECK-LABEL: entry:
; CHECK: %fptr = load void ()*, void ()** @ptr_to_func, align 8
; CHECK: call void %fptr()
; CHECK: ret void
entry:
%fptr = load void ()*, void ()** @ptr_to_func, align 8
call void %fptr()
ret void
}
; No change
define internal void @func_does_not_use_lds_1() {
; CHECK-LABEL: entry:
; CHECK: call void @func_does_not_use_lds_2()
; CHECK: call void @func_does_not_use_lds_3()
; CHECK: ret void
entry:
call void @func_does_not_use_lds_2()
call void @func_does_not_use_lds_3()
ret void
}
; Pointer initialization code shoud be added
define protected amdgpu_kernel void @kernel_reaches_lds() {
; CHECK-LABEL: entry:
; CHECK: %0 = call i32 @llvm.amdgcn.mbcnt.lo(i32 -1, i32 0)
; CHECK: %1 = icmp eq i32 %0, 0
; CHECK: br i1 %1, label %2, label %3
;
; CHECK-LABEL: 2:
; CHECK: store i16 ptrtoint ([4 x i32] addrspace(3)* @lds_used_within_func to i16), i16 addrspace(3)* @lds_used_within_func.ptr, align 2
; CHECK: br label %3
;
; CHECK-LABEL: 3:
; CHECK: call void @llvm.amdgcn.wave.barrier()
; CHECK: call void @func_does_not_use_lds_1()
; CHECK: ret void
entry:
call void @func_does_not_use_lds_1()
ret void
}
; No change here since this kernel does not reach @func_uses_lds which uses lds.
define protected amdgpu_kernel void @kernel_does_not_reach_lds() {
; CHECK-LABEL: entry:
; CHECK: ret void
entry:
ret void
}
|
