File: noalias-wraparound-bug.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (24 lines) | stat: -rw-r--r-- 852 bytes parent folder | download | duplicates (9) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
; RUN: opt -S -basic-aa -gvn < %s | FileCheck %s

target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.6.0"

; We incorrectly returned noalias in the example below for "tmp5" and
; "tmp12" returning i32 32, since basicaa converted the offsets to 64b
; and missed the wrap-around

define i32 @foo(i8* %buffer) {
entry:
  %tmp2 = getelementptr i8, i8* %buffer, i32 -2071408432
  %tmp3 = bitcast i8* %tmp2 to i32*
  %tmp4 = getelementptr i8, i8* %buffer, i32 128
  %tmp5 = bitcast i8* %tmp4 to i32*
  store i32 32, i32* %tmp5, align 4
  %tmp12 = getelementptr i32, i32* %tmp3, i32 -1629631508
  store i32 28, i32* %tmp12, align 4
  %tmp13 = getelementptr i8, i8* %buffer, i32 128
  %tmp14 = bitcast i8* %tmp13 to i32*
  %tmp2083 = load i32, i32* %tmp14, align 4
; CHECK: ret i32 28
  ret i32 %tmp2083
}