1 ; This testcase makes sure that size is taken to account when alias analysis 2 ; is performed. It is not legal to delete the second load instruction because 3 ; the value computed by the first load instruction is changed by the store. 4 5 ; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s 6 7 define i32 @test() { 8 ; CHECK: %Y.DONOTREMOVE = load i32, i32* %A 9 ; CHECK: %Z = sub i32 0, %Y.DONOTREMOVE 10 %A = alloca i32 11 store i32 0, i32* %A 12 %X = load i32, i32* %A 13 %B = bitcast i32* %A to i8* 14 %C = getelementptr i8, i8* %B, i64 1 15 store i8 1, i8* %C ; Aliases %A 16 %Y.DONOTREMOVE = load i32, i32* %A 17 %Z = sub i32 %X, %Y.DONOTREMOVE 18 ret i32 %Z 19 } 20 21
