1 ; RUN: opt -S -disable-basicaa -tbaa -cfl-aa -gvn < %s | FileCheck -check-prefix=CFLAA %s 2 ; RUN: opt -S -disable-basicaa -tbaa -gvn < %s | FileCheck %s 3 ; Adapted from the BasicAA full-store-partial-alias.ll test. 4 5 ; CFL AA could notice that the store stores to the entire %u object, 6 ; so the %tmp5 load is PartialAlias with the store and suppress TBAA. 7 ; FIXME: However, right now, CFLAA cannot prove PartialAlias here 8 ; Without CFL AA, TBAA should say that %tmp5 is NoAlias with the store. 9 10 target datalayout = "e-p:64:64:64" 11 12 %union.anon = type { double } 13 14 @u = global %union.anon { double -2.500000e-01 }, align 8 15 @endianness_test = global i64 1, align 8 16 17 define i32 @signbit(double %x) nounwind { 18 ; FIXME: This would be ret i32 %tmp5.lobit if CFLAA could prove PartialAlias 19 ; CFLAA: ret i32 0 20 ; CHECK: ret i32 0 21 entry: 22 %u = alloca %union.anon, align 8 23 %tmp9 = getelementptr inbounds %union.anon, %union.anon* %u, i64 0, i32 0 24 store double %x, double* %tmp9, align 8, !tbaa !0 25 %tmp2 = load i32, i32* bitcast (i64* @endianness_test to i32*), align 8, !tbaa !3 26 %idxprom = sext i32 %tmp2 to i64 27 %tmp4 = bitcast %union.anon* %u to [2 x i32]* 28 %arrayidx = getelementptr inbounds [2 x i32], [2 x i32]* %tmp4, i64 0, i64 %idxprom 29 %tmp5 = load i32, i32* %arrayidx, align 4, !tbaa !3 30 %tmp5.lobit = lshr i32 %tmp5, 31 31 ret i32 %tmp5.lobit 32 } 33 34 !0 = !{!4, !4, i64 0} 35 !1 = !{!"omnipotent char", !2} 36 !2 = !{!"Simple C/C++ TBAA", null} 37 !3 = !{!5, !5, i64 0} 38 !4 = !{!"double", !1} 39 !5 = !{!"int", !1} 40
