1 ; RUN: opt -tbaa -disable-basicaa -gvn -instcombine -S < %s | FileCheck %s --check-prefix=TBAA 2 ; RUN: opt -tbaa -gvn -instcombine -S < %s | FileCheck %s --check-prefix=BASICAA 3 4 ; According to the TBAA metadata the load and store don't alias. However, 5 ; according to the actual code, they do. Disabling basicaa shows the raw TBAA 6 ; results. 7 8 target datalayout = "e-p:64:64:64" 9 10 ; Test for simple MustAlias aliasing. 11 12 ; TBAA: @trouble 13 ; TBAA: ret i32 0 14 ; BASICAA: @trouble 15 ; BASICAA: ret i32 1075000115 16 define i32 @trouble(i32* %x) nounwind { 17 entry: 18 store i32 0, i32* %x, !tbaa !0 19 %0 = bitcast i32* %x to float* 20 store float 0x4002666660000000, float* %0, !tbaa !3 21 %tmp3 = load i32, i32* %x, !tbaa !0 22 ret i32 %tmp3 23 } 24 25 ; Test for PartialAlias aliasing. GVN doesn't yet eliminate the load 26 ; in the BasicAA case. 27 28 ; TBAA: @offset 29 ; TBAA: ret i64 0 30 ; BASICAA: @offset 31 ; BASICAA: ret i64 %tmp3 32 define i64 @offset(i64* %x) nounwind { 33 entry: 34 store i64 0, i64* %x, !tbaa !4 35 %0 = bitcast i64* %x to i8* 36 %1 = getelementptr i8, i8* %0, i64 1 37 store i8 1, i8* %1, !tbaa !5 38 %tmp3 = load i64, i64* %x, !tbaa !4 39 ret i64 %tmp3 40 } 41 42 !0 = !{!2, !2, i64 0} 43 !1 = !{!"simple"} 44 !2 = !{!"int", !1} 45 !3 = !{!6, !6, i64 0} 46 !4 = !{!7, !7, i64 0} 47 !5 = !{!8, !8, i64 0} 48 !6 = !{!"float", !1} 49 !7 = !{!"long", !1} 50 !8 = !{!"small", !1} 51
