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
|
; REQUIRES: asserts
; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -S -debug-only=loop-vectorize < %s 2>%t | FileCheck %s
; RUN: cat %t | FileCheck %s --check-prefix=CHECK-COST
target triple = "aarch64-unknown-linux-gnu"
; CHECK-COST: Checking a loop in 'fixed_width'
; CHECK-COST: Cost of 10 for VF 2: WIDEN store vp<%6>, ir<2>, vp<%5>
; CHECK-COST: Cost of 20 for VF 4: WIDEN store vp<%6>, ir<2>, vp<%5>
; CHECK-COST: Selecting VF: 1.
; We should decide this loop is not worth vectorising using fixed width vectors
define void @fixed_width(ptr noalias nocapture %a, ptr noalias nocapture readonly %b, i64 %n) #0 {
; CHECK-LABEL: @fixed_width(
; CHECK-NOT: vector.body
entry:
%cmp6 = icmp sgt i64 %n, 0
br i1 %cmp6, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader: ; preds = %entry
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.inc
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
for.body: ; preds = %for.body.preheader, %for.inc
%i.07 = phi i64 [ %inc, %for.inc ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, ptr %b, i64 %i.07
%0 = load i32, ptr %arrayidx, align 4
%tobool.not = icmp eq i32 %0, 0
br i1 %tobool.not, label %for.inc, label %if.then
if.then: ; preds = %for.body
%arrayidx1 = getelementptr inbounds i32, ptr %a, i64 %i.07
store i32 2, ptr %arrayidx1, align 4
br label %for.inc
for.inc: ; preds = %for.body, %if.then
%inc = add nuw nsw i64 %i.07, 1
%exitcond.not = icmp eq i64 %inc, %n
br i1 %exitcond.not, label %for.cond.cleanup.loopexit, label %for.body, !llvm.loop !5
}
; CHECK-COST: Checking a loop in 'scalable'
; CHECK-COST: Found an estimated cost of 1 for VF vscale x 4 For instruction: store i32 2, ptr %arrayidx1, align 4
define void @scalable(ptr noalias nocapture %a, ptr noalias nocapture readonly %b, i64 %n) #0 {
; CHECK-LABEL: @scalable(
; CHECK: vector.body
; CHECK: call void @llvm.masked.store.nxv4i32.p0
entry:
%cmp6 = icmp sgt i64 %n, 0
br i1 %cmp6, label %for.body.preheader, label %for.cond.cleanup
for.body.preheader: ; preds = %entry
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.inc
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
for.body: ; preds = %for.body.preheader, %for.inc
%i.07 = phi i64 [ %inc, %for.inc ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, ptr %b, i64 %i.07
%0 = load i32, ptr %arrayidx, align 4
%tobool.not = icmp eq i32 %0, 0
br i1 %tobool.not, label %for.inc, label %if.then
if.then: ; preds = %for.body
%arrayidx1 = getelementptr inbounds i32, ptr %a, i64 %i.07
store i32 2, ptr %arrayidx1, align 4
br label %for.inc
for.inc: ; preds = %for.body, %if.then
%inc = add nuw nsw i64 %i.07, 1
%exitcond.not = icmp eq i64 %inc, %n
br i1 %exitcond.not, label %for.cond.cleanup.loopexit, label %for.body, !llvm.loop !0
}
attributes #0 = { "target-features"="+neon,+sve" }
!0 = distinct !{!0, !1, !2, !3, !4}
!1 = !{!"llvm.loop.mustprogress"}
!2 = !{!"llvm.loop.vectorize.width", i32 4}
!3 = !{!"llvm.loop.vectorize.scalable.enable", i1 true}
!4 = !{!"llvm.loop.vectorize.enable", i1 true}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.vectorize.scalable.enable", i1 false}
|
