File: forked-pointers.ll

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (183 lines) | stat: -rw-r--r-- 7,512 bytes parent folder | download | duplicates (3)
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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
; RUN: opt -loop-accesses -analyze -enable-new-pm=0 %s 2>&1 | FileCheck %s
; RUN: opt -disable-output -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' %s 2>&1 | FileCheck %s

target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"

; CHECK-LABEL: function 'forked_ptrs_different_base_same_offset':
; CHECK-NEXT:  for.body:
; CHECK-NEXT:    Report: cannot identify array bounds
; CHECK-NEXT:    Dependences:
; CHECK-NEXT:    Run-time memory checks:
; CHECK-NEXT:    Grouped accesses:
; CHECK-EMPTY:
; CHECK-NEXT:    Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:    SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:    Expressions re-written:

;;;; Derived from the following C code
;; void forked_ptrs_different_base_same_offset(float *A, float *B, float *C, int *D) {
;;   for (int i=0; i<100; i++) {
;;     if (D[i] != 0) {
;;       C[i] = A[i];
;;     } else {
;;       C[i] = B[i];
;;     }
;;   }
;; }

define dso_local void @forked_ptrs_different_base_same_offset(float* nocapture readonly %Base1, float* nocapture readonly %Base2, float* nocapture %Dest, i32* nocapture readonly %Preds) {
entry:
  br label %for.body

for.cond.cleanup:
  ret void

for.body:
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
  %arrayidx = getelementptr inbounds i32, i32* %Preds, i64 %indvars.iv
  %0 = load i32, i32* %arrayidx, align 4
  %cmp1.not = icmp eq i32 %0, 0
  %spec.select = select i1 %cmp1.not, float* %Base2, float* %Base1
  %.sink.in = getelementptr inbounds float, float* %spec.select, i64 %indvars.iv
  %.sink = load float, float* %.sink.in, align 4
  %1 = getelementptr inbounds float, float* %Dest, i64 %indvars.iv
  store float %.sink, float* %1, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 100
  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}

; CHECK-LABEL: function 'forked_ptrs_same_base_different_offset':
; CHECK-NEXT:   for.body:
; CHECK-NEXT:     Report: cannot identify array bounds
; CHECK-NEXT:     Dependences:
; CHECK-NEXT:     Run-time memory checks:
; CHECK-NEXT:     Grouped accesses:
; CHECK-EMPTY:
; CHECK-NEXT:     Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:     SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:     Expressions re-written:

;;;; Derived from the following C code
;; void forked_ptrs_same_base_different_offset(float *A, float *B, int *C) {
;;   int offset;
;;   for (int i = 0; i < 100; i++) {
;;     if (C[i] != 0)
;;       offset = i;
;;     else
;;       offset = i+1;
;;     B[i] = A[offset];
;;   }
;; }

define dso_local void @forked_ptrs_same_base_different_offset(float* nocapture readonly %Base, float* nocapture %Dest, i32* nocapture readonly %Preds) {
entry:
  br label %for.body

for.cond.cleanup:                                 ; preds = %for.body
  ret void

for.body:                                         ; preds = %entry, %for.body
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
  %i.014 = phi i32 [ 0, %entry ], [ %add, %for.body ]
  %arrayidx = getelementptr inbounds i32, i32* %Preds, i64 %indvars.iv
  %0 = load i32, i32* %arrayidx, align 4
  %cmp1.not = icmp eq i32 %0, 0
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %add = add nuw nsw i32 %i.014, 1
  %1 = trunc i64 %indvars.iv to i32
  %offset.0 = select i1 %cmp1.not, i32 %add, i32 %1
  %idxprom213 = zext i32 %offset.0 to i64
  %arrayidx3 = getelementptr inbounds float, float* %Base, i64 %idxprom213
  %2 = load float, float* %arrayidx3, align 4
  %arrayidx5 = getelementptr inbounds float, float* %Dest, i64 %indvars.iv
  store float %2, float* %arrayidx5, align 4
  %exitcond.not = icmp eq i64 %indvars.iv.next, 100
  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}

;;;; Cases that can be handled by a forked pointer but are not currently allowed.

; CHECK-LABEL: function 'forked_ptrs_uniform_and_strided_forks':
; CHECK-NEXT:  for.body:
; CHECK-NEXT:    Report: cannot identify array bounds
; CHECK-NEXT:    Dependences:
; CHECK-NEXT:    Run-time memory checks:
; CHECK-NEXT:    Grouped accesses:
; CHECK-EMPTY:
; CHECK-NEXT:    Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:    SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:    Expressions re-written:

;;;; Derived from forked_ptrs_same_base_different_offset with a manually
;;;; added uniform offset and a mul to provide a stride

define dso_local void @forked_ptrs_uniform_and_strided_forks(float* nocapture readonly %Base, float* nocapture %Dest, i32* nocapture readonly %Preds) {
entry:
  br label %for.body

for.cond.cleanup:                                 ; preds = %for.body
  ret void

for.body:                                         ; preds = %entry, %for.body
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
  %i.014 = phi i32 [ 0, %entry ], [ %add, %for.body ]
  %arrayidx = getelementptr inbounds i32, i32* %Preds, i64 %indvars.iv
  %0 = load i32, i32* %arrayidx, align 4
  %cmp1.not = icmp eq i32 %0, 0
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %add = add nuw nsw i32 %i.014, 1
  %1 = trunc i64 %indvars.iv to i32
  %mul = mul i32 %1, 3
  %offset.0 = select i1 %cmp1.not, i32 4, i32 %mul
  %idxprom213 = sext i32 %offset.0 to i64
  %arrayidx3 = getelementptr inbounds float, float* %Base, i64 %idxprom213
  %2 = load float, float* %arrayidx3, align 4
  %arrayidx5 = getelementptr inbounds float, float* %Dest, i64 %indvars.iv
  store float %2, float* %arrayidx5, align 4
  %exitcond.not = icmp eq i64 %indvars.iv.next, 100
  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}

; CHECK-LABEL:  function 'forked_ptrs_gather_and_contiguous_forks':
; CHECK-NEXT:   for.body:
; CHECK-NEXT:     Report: cannot identify array bounds
; CHECK-NEXT:     Dependences:
; CHECK-NEXT:     Run-time memory checks:
; CHECK-NEXT:     Grouped accesses:
; CHECK-EMPTY:
; CHECK-NEXT:     Non vectorizable stores to invariant address were not found in loop.
; CHECK-NEXT:     SCEV assumptions:
; CHECK-EMPTY:
; CHECK-NEXT:     Expressions re-written:

;;;; Derived from forked_ptrs_same_base_different_offset with a gather
;;;; added using Preds as an index array in addition to the per-iteration
;;;; condition.

define dso_local void @forked_ptrs_gather_and_contiguous_forks(float* nocapture readonly %Base1, float* nocapture readonly %Base2, float* nocapture %Dest, i32* nocapture readonly %Preds) {
entry:
  br label %for.body

for.cond.cleanup:                                 ; preds = %for.body
  ret void

for.body:                                         ; preds = %entry, %for.body
  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
  %arrayidx = getelementptr inbounds i32, i32* %Preds, i64 %indvars.iv
  %0 = load i32, i32* %arrayidx, align 4
  %cmp1.not = icmp eq i32 %0, 0
  %arrayidx9 = getelementptr inbounds float, float* %Base2, i64 %indvars.iv
  %idxprom4 = sext i32 %0 to i64
  %arrayidx5 = getelementptr inbounds float, float* %Base1, i64 %idxprom4
  %.sink.in = select i1 %cmp1.not, float* %arrayidx9, float* %arrayidx5
  %.sink = load float, float* %.sink.in, align 4
  %1 = getelementptr inbounds float, float* %Dest, i64 %indvars.iv
  store float %.sink, float* %1, align 4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 100
  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
}