1; REQUIRES: asserts 2; RUN: opt -mtriple=systemz-unknown -mcpu=z13 -O3 -disable-output %s 3 4; During transform to LCSSA, an access becomes obfuscated to: 5; (2 = phi (phi(val), val)), which BasicAA fails to analyze. 6; It's currently hard coded in BasicAA to return MayAlias for nested phis. 7; This leads MemorySSA to finding a new (false) clobber for a previously 8; optimized access. With verifyClobber included in verifyMemorySSA, such a 9; transformation will cause MemorySSA verification to fail. 10; If the verifyClobber is re-enabled, this test will crash. 11 12target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64" 13target triple = "s390x-ibm-linux" 14 15%0 = type <{ i64, i8, i64, i16 }> 16 17@g_54 = external dso_local global i16, align 2 18@g_101 = external dso_local global <{ i64, i8, i64, i8, i8 }>, align 2 19 20declare dso_local void @safe_lshift_func_int16_t_s_s() 21declare dso_local i8 @safe_div_func_int8_t_s_s() 22 23define dso_local void @func_47(ptr %arg) { 24bb: 25 %tmp = alloca i32, align 4 26 br label %bb1 27 28bb1: ; preds = %bb12, %bb 29 %tmp2 = getelementptr inbounds %0, ptr %arg, i32 0, i32 3 30 store i16 undef, ptr %tmp2, align 1 31 %tmp3 = call signext i8 @safe_div_func_int8_t_s_s() 32 %tmp7 = icmp ne i8 %tmp3, 0 33 br i1 %tmp7, label %bb8, label %bb10 34 35bb8: ; preds = %bb1 36 %tmp9 = icmp eq i32 0, 0 37 br i1 %tmp9, label %bb12, label %bb13 38 39bb10: ; preds = %bb10, %bb1 40 call void @safe_lshift_func_int16_t_s_s() 41 %tmp11 = getelementptr inbounds %0, ptr %arg, i32 0, i32 3 42 store i16 0, ptr %tmp11, align 1 43 store i8 0, ptr getelementptr inbounds (%0, ptr @g_101, i32 0, i32 1), align 2 44 br label %bb10 45 46bb12: ; preds = %bb8 47 store i16 0, ptr @g_54, align 2 48 br label %bb1 49 50bb13: ; preds = %bb8 51 ret void 52} 53 54 55