| ; RUN: opt -S -tbaa -gvn < %s | FileCheck -check-prefix=BASICAA %s |
| ; RUN: opt -S -tbaa -disable-basic-aa -gvn < %s | FileCheck %s |
| ; rdar://8875631, rdar://8875069 |
| |
| ; BasicAA should notice that the store stores to the entire %u object, |
| ; so the %tmp5 load is PartialAlias with the store and suppress TBAA. |
| ; Without BasicAA, TBAA should say that %tmp5 is NoAlias with the store. |
| |
| target datalayout = "e-p:64:64:64" |
| |
| %union.anon = type { double } |
| |
| @u = global %union.anon { double -2.500000e-01 }, align 8 |
| @endianness_test = global i64 1, align 8 |
| |
| define i32 @signbit(double %x) nounwind { |
| ; BASICAA: ret i32 %tmp5.lobit |
| ; CHECK: ret i32 0 |
| entry: |
| %u = alloca %union.anon, align 8 |
| %tmp9 = getelementptr inbounds %union.anon, %union.anon* %u, i64 0, i32 0 |
| store double %x, double* %tmp9, align 8, !tbaa !0 |
| %tmp2 = load i32, i32* bitcast (i64* @endianness_test to i32*), align 8, !tbaa !3 |
| %idxprom = sext i32 %tmp2 to i64 |
| %tmp4 = bitcast %union.anon* %u to [2 x i32]* |
| %arrayidx = getelementptr inbounds [2 x i32], [2 x i32]* %tmp4, i64 0, i64 %idxprom |
| %tmp5 = load i32, i32* %arrayidx, align 4, !tbaa !3 |
| %tmp5.lobit = lshr i32 %tmp5, 31 |
| ret i32 %tmp5.lobit |
| } |
| |
| !0 = !{!4, !4, i64 0} |
| !1 = !{!"omnipotent char", !2} |
| !2 = !{!"Simple C/C++ TBAA"} |
| !3 = !{!5, !5, i64 0} |
| !4 = !{!"double", !1} |
| !5 = !{!"int", !1} |