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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
; RUN: opt -S -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; Check the scenario where we have an unknown Stride, which happens to also be
; the loop iteration count, so if we specialize the loop for the Stride==1 case,
; this also implies that the loop will iterate no more than a single iteration,
; as in the following example:
;
; unsigned int N;
; int tmp = 0;
; for(unsigned int k=0;k<N;k++) {
; tmp+=(int)B[k*N+j];
; }
;
; We check here that the following runtime scev guard for Stride==1 is NOT generated:
; vector.scevcheck:
; %ident.check = icmp ne i32 %N, 1
; %0 = or i1 false, %ident.check
; br i1 %0, label %scalar.ph, label %vector.ph
; Instead the loop is vectorized with an unknown stride.
; CHECK-LABEL: @foo1
; CHECK: for.body.lr.ph
; CHECK-NOT: %ident.check = icmp ne i32 %N, 1
; CHECK-NOT: %{{[0-9]+}} = or i1 false, %ident.check
; CHECK-NOT: br i1 %{{[0-9]+}}, label %scalar.ph, label %vector.ph
; CHECK: vector.ph
; CHECK: vector.body
; CHECK: <4 x i32>
; CHECK: middle.block
; CHECK: scalar.ph
define i32 @foo1(i32 %N, ptr nocapture readnone %A, ptr nocapture readonly %B, i32 %i, i32 %j) {
entry:
%cmp8 = icmp eq i32 %N, 0
br i1 %cmp8, label %for.end, label %for.body.lr.ph
for.body.lr.ph:
br label %for.body
for.body:
%tmp.010 = phi i32 [ 0, %for.body.lr.ph ], [ %add1, %for.body ]
%k.09 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%mul = mul i32 %k.09, %N
%add = add i32 %mul, %j
%arrayidx = getelementptr inbounds i16, ptr %B, i32 %add
%0 = load i16, ptr %arrayidx, align 2
%conv = sext i16 %0 to i32
%add1 = add nsw i32 %tmp.010, %conv
%inc = add nuw i32 %k.09, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
%add1.lcssa = phi i32 [ %add1, %for.body ]
br label %for.end
for.end:
%tmp.0.lcssa = phi i32 [ 0, %entry ], [ %add1.lcssa, %for.end.loopexit ]
ret i32 %tmp.0.lcssa
}
; Check the same, but also where the Stride and the loop iteration count
; are not of the same data type.
;
; unsigned short N;
; int tmp = 0;
; for(unsigned int k=0;k<N;k++) {
; tmp+=(int)B[k*N+j];
; }
;
; We check here that the following runtime scev guard for Stride==1 is NOT generated:
; vector.scevcheck:
; %ident.check = icmp ne i16 %N, 1
; %0 = or i1 false, %ident.check
; br i1 %0, label %scalar.ph, label %vector.ph
; CHECK-LABEL: @foo2
; CHECK: vector.scevcheck:
; CHECK-NEXT: add nsw i32 %conv, -1
; CHECK-NEXT: [[NEG:%.+]] = sub i32 0, %conv
; CHECK-NOT: %ident.check = icmp ne i16 %N, 1
; CHECK-NOT: %{{[0-9]+}} = or i1 false, %ident.check
; CHECK-NOT: br i1 %{{[0-9]+}}, label %scalar.ph, label %vector.ph
; CHECK: vector.ph
; CHECK: vector.body
; CHECK: <4 x i32>
; CHECK: middle.block
; CHECK: scalar.ph
define i32 @foo2(i16 zeroext %N, ptr nocapture readnone %A, ptr nocapture readonly %B, i32 %i, i32 %j) {
entry:
%conv = zext i16 %N to i32
%cmp11 = icmp eq i16 %N, 0
br i1 %cmp11, label %for.end, label %for.body.lr.ph
for.body.lr.ph:
br label %for.body
for.body:
%tmp.013 = phi i32 [ 0, %for.body.lr.ph ], [ %add4, %for.body ]
%k.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%mul = mul nuw i32 %k.012, %conv
%add = add i32 %mul, %j
%arrayidx = getelementptr inbounds i16, ptr %B, i32 %add
%0 = load i16, ptr %arrayidx, align 2
%conv3 = sext i16 %0 to i32
%add4 = add nsw i32 %tmp.013, %conv3
%inc = add nuw nsw i32 %k.012, 1
%exitcond = icmp eq i32 %inc, %conv
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
%add4.lcssa = phi i32 [ %add4, %for.body ]
br label %for.end
for.end:
%tmp.0.lcssa = phi i32 [ 0, %entry ], [ %add4.lcssa, %for.end.loopexit ]
ret i32 %tmp.0.lcssa
}
|
