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
| ; RUN: opt -loop-load-elim -S < %s | \
; RUN: FileCheck %s -check-prefix=ALL -check-prefix=ONE_STRIDE_SPEC \
; RUN: -check-prefix=TWO_STRIDE_SPEC
; RUN: opt -loop-load-elim -S -enable-mem-access-versioning=0 < %s | \
; RUN: FileCheck %s -check-prefix=ALL -check-prefix=NO_ONE_STRIDE_SPEC \
; RUN: -check-prefix=NO_TWO_STRIDE_SPEC
; RUN: opt -loop-load-elim -S -loop-load-elimination-scev-check-threshold=1 < %s | \
; RUN: FileCheck %s -check-prefix=ALL -check-prefix=ONE_STRIDE_SPEC \
; RUN: -check-prefix=NO_TWO_STRIDE_SPEC
; Forwarding in the presence of symbolic strides:
;
; for (unsigned i = 0; i < 100; i++)
; A[i + 1] = A[Stride * i] + B[i];
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
; ALL-LABEL: @f(
define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N,
i64 %stride) {
; ONE_STRIDE_SPEC: %ident.check = icmp ne i64 %stride, 1
entry:
; NO_ONE_STRIDE_SPEC-NOT: %load_initial = load i32, i32* %A
; ONE_STRIDE_SPEC: %load_initial = load i32, i32* %A
br label %for.body
for.body: ; preds = %for.body, %entry
; NO_ONE_STRIDE_SPEC-NOT: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
; ONE_STRIDE_SPEC: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%mul = mul i64 %indvars.iv, %stride
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %mul
%load = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
%load_1 = load i32, i32* %arrayidx2, align 4
; NO_ONE_STRIDE_SPEC-NOT: %add = add i32 %load_1, %store_forwarded
; ONE_STRIDE_SPEC: %add = add i32 %load_1, %store_forwarded
%add = add i32 %load_1, %load
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
store i32 %add, i32* %arrayidx_next, align 4
%exitcond = icmp eq i64 %indvars.iv.next, %N
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; With two symbolic strides:
;
; for (unsigned i = 0; i < 100; i++)
; A[Stride2 * (i + 1)] = A[Stride1 * i] + B[i];
; ALL-LABEL: @two_strides(
define void @two_strides(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N,
i64 %stride.1, i64 %stride.2) {
; TWO_STRIDE_SPEC: %ident.check = icmp ne i64 %stride.2, 1
; TWO_STRIDE_SPEC: %ident.check1 = icmp ne i64 %stride.1, 1
; NO_TWO_STRIDE_SPEC-NOT: %ident.check{{.*}} = icmp ne i64 %stride{{.*}}, 1
entry:
; NO_TWO_STRIDE_SPEC-NOT: %load_initial = load i32, i32* %A
; TWO_STRIDE_SPEC: %load_initial = load i32, i32* %A
br label %for.body
for.body: ; preds = %for.body, %entry
; NO_TWO_STRIDE_SPEC-NOT: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
; TWO_STRIDE_SPEC: %store_forwarded = phi i32 [ %load_initial, {{.*}} ], [ %add, %for.body ]
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%mul = mul i64 %indvars.iv, %stride.1
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %mul
%load = load i32, i32* %arrayidx, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
%load_1 = load i32, i32* %arrayidx2, align 4
; NO_TWO_STRIDE_SPEC-NOT: %add = add i32 %load_1, %store_forwarded
; TWO_STRIDE_SPEC: %add = add i32 %load_1, %store_forwarded
%add = add i32 %load_1, %load
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%mul.2 = mul i64 %indvars.iv.next, %stride.2
%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %mul.2
store i32 %add, i32* %arrayidx_next, align 4
%exitcond = icmp eq i64 %indvars.iv.next, %N
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
|