1; RUN: opt -S -tbaa -gvn < %s | FileCheck -check-prefix=BASICAA %s 2; RUN: opt -S -tbaa -disable-basicaa -gvn < %s | FileCheck %s 3; rdar://8875631, rdar://8875069 4 5; BasicAA should notice that the store stores to the entire %u object, 6; so the %tmp5 load is PartialAlias with the store and suppress TBAA. 7; Without BasicAA, TBAA should say that %tmp5 is NoAlias with the store. 8 9target datalayout = "e-p:64:64:64" 10 11%union.anon = type { double } 12 13@u = global %union.anon { double -2.500000e-01 }, align 8 14@endianness_test = global i64 1, align 8 15 16define i32 @signbit(double %x) nounwind { 17; BASICAA: ret i32 %tmp5.lobit 18; CHECK: ret i32 0 19entry: 20 %u = alloca %union.anon, align 8 21 %tmp9 = getelementptr inbounds %union.anon, %union.anon* %u, i64 0, i32 0 22 store double %x, double* %tmp9, align 8, !tbaa !0 23 %tmp2 = load i32, i32* bitcast (i64* @endianness_test to i32*), align 8, !tbaa !3 24 %idxprom = sext i32 %tmp2 to i64 25 %tmp4 = bitcast %union.anon* %u to [2 x i32]* 26 %arrayidx = getelementptr inbounds [2 x i32], [2 x i32]* %tmp4, i64 0, i64 %idxprom 27 %tmp5 = load i32, i32* %arrayidx, align 4, !tbaa !3 28 %tmp5.lobit = lshr i32 %tmp5, 31 29 ret i32 %tmp5.lobit 30} 31 32!0 = !{!4, !4, i64 0} 33!1 = !{!"omnipotent char", !2} 34!2 = !{!"Simple C/C++ TBAA", null} 35!3 = !{!5, !5, i64 0} 36!4 = !{!"double", !1} 37!5 = !{!"int", !1} 38