File: memcheck-for-loop-invariant.ll

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (38 lines) | stat: -rw-r--r-- 1,109 bytes parent folder | download 
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
 
; RUN: opt -passes='print-access-info' -disable-output  < %s 2>&1 | FileCheck %s

; Handle memchecks involving loop-invariant addresses:
;
; extern int *A, *b;
; for (i = 0; i < N; ++i) {
;  A[i] = b;
; }

target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

; CHECK: Memory dependences are safe with run-time checks
; CHECK: Run-time memory checks:
; CHECK-NEXT: Check 0:
; CHECK-NEXT:   Comparing group ({{.*}}):
; CHECK-NEXT:     %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
; CHECK-NEXT:   Against group ({{.*}}):
; CHECK-NEXT:   i32* %b

define void @f(i32* %a, i32* %b) {
entry:
  br label %for.body

for.body:                                         ; preds = %for.body, %entry
  %ind = phi i64 [ 0, %entry ], [ %inc, %for.body ]

  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind

  %loadB = load i32, i32* %b, align 4
  store i32 %loadB, i32* %arrayidxA, align 4

  %inc = add nuw nsw i64 %ind, 1
  %exitcond = icmp eq i64 %inc, 20
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body
  ret void
}