test/Analysis/BasicAA/2003-04-22-GEPProblem.ll


1
2
3
4
5
6
7
8
9
10
11
12
13
14

; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s

; BasicAA was incorrectly concluding that P1 and P2 didn't conflict!

define i32 @test(i32 *%Ptr, i64 %V) {
; CHECK: sub i32 %X, %Y
  %P2 = getelementptr i32* %Ptr, i64 1
  %P1 = getelementptr i32* %Ptr, i64 %V
  %X = load i32* %P1
  store i32 5, i32* %P2
  %Y = load i32* %P1
  %Z = sub i32 %X, %Y
  ret i32 %Z
}