File: noalias-wraparound-bug.ll

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.4-1~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,998,488 kB
  • sloc: cpp: 6,951,470; ansic: 1,486,052; asm: 913,550; python: 232,020; f90: 80,126; objc: 75,349; lisp: 37,276; pascal: 16,990; sh: 9,935; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,164; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (21 lines) | stat: -rw-r--r-- 757 bytes parent folder | download | duplicates (12) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
; RUN: opt -S -aa-pipeline=basic-aa -passes=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(ptr %buffer) {
entry:
  %tmp2 = getelementptr i8, ptr %buffer, i32 -2071408432
  %tmp4 = getelementptr i8, ptr %buffer, i32 128
  store i32 32, ptr %tmp4, align 4
  %tmp12 = getelementptr i32, ptr %tmp2, i32 -1629631508
  store i32 28, ptr %tmp12, align 4
  %tmp13 = getelementptr i8, ptr %buffer, i32 128
  %tmp2083 = load i32, ptr %tmp13, align 4
; CHECK: ret i32 28
  ret i32 %tmp2083
}