File: nonnull-gep-out-of-bounds.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 (18 lines) | stat: -rw-r--r-- 566 bytes parent folder | download | duplicates (7) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 
; RUN: opt -jump-threading -S %s -o - | FileCheck %s

define i32 @f(i64* %a, i64 %i) {
entry:
  store i64 0, i64* %a, align 8
  %p = getelementptr i64, i64* %a, i64 %i
  %c = icmp eq i64* %p, null
  ; `%a` is non-null at the end of the block, because we store through it.
  ; However, `%p` is derived from `%a` via a GEP that is not `inbounds`, therefore we cannot judge `%p` is non-null as well
  ; and must retain the `icmp` instruction.
  ; CHECK: %c = icmp eq i64* %p, null
  br i1 %c, label %if.else, label %if.then
if.then:
  ret i32 0

if.else:
  ret i32 1
}