Prevent assert in CombinerGlobalAA with null values

DAGCombiner::isAlias can be called with SrcValue1 or SrcValue2 null, and we
can't use AA in this case (if we try, then the casting code in AA will assert).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190763 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 137 insertions, 0 deletions

diff --git a/test/CodeGen/PowerPC/glob-comp-aa-crash.ll b/test/CodeGen/PowerPC/glob-comp-aa-crash.ll
new file mode 100644
index 0000000..3e4ef52
--- /dev/null
+++ b/test/CodeGen/PowerPC/glob-comp-aa-crash.ll
@@ -0,0 +1,137 @@
+; RUN: llc -mtriple=powerpc64-bgq-linux -mcpu=a2 < %s
+target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
+target triple = "powerpc64-bgq-linux"
+
+%"class.std::__1::__assoc_sub_state" = type { %"class.std::__1::__shared_count", %"class.std::__exception_ptr::exception_ptr", %"class.std::__1::mutex", %"class.std::__1::condition_variable", i32 }
+%"class.std::__1::__shared_count" = type { i32 (...)**, i64 }
+%"class.std::__exception_ptr::exception_ptr" = type { i8* }
+%"class.std::__1::mutex" = type { %union.pthread_mutex_t }
+%union.pthread_mutex_t = type { %"struct.<anonymous union>::__pthread_mutex_s" }
+%"struct.<anonymous union>::__pthread_mutex_s" = type { i32, i32, i32, i32, i32, i32, %struct.__pthread_internal_list }
+%struct.__pthread_internal_list = type { %struct.__pthread_internal_list*, %struct.__pthread_internal_list* }
+%"class.std::__1::condition_variable" = type { %union.pthread_cond_t }
+%union.pthread_cond_t = type { %struct.anon }
+%struct.anon = type { i32, i32, i64, i64, i64, i8*, i32, i32 }
+%"class.std::__1::unique_lock" = type { %"class.std::__1::mutex"*, i8 }
+
+declare i32 @__gxx_personality_v0(...)
+
+; Function Attrs: optsize
+define void @_ZNSt3__117__assoc_sub_state4copyEv(%"class.std::__1::__assoc_sub_state"* %this) #0 align 2 {
+entry:
+  %__lk = alloca %"class.std::__1::unique_lock", align 8
+  %ref.tmp = alloca %"class.std::__exception_ptr::exception_ptr", align 8
+  %tmp = alloca { i64, i64 }, align 8
+  %agg.tmp = alloca %"class.std::__exception_ptr::exception_ptr", align 8
+  %__mut_ = getelementptr inbounds %"class.std::__1::__assoc_sub_state"* %this, i64 0, i32 2
+  %__m_.i.i = getelementptr inbounds %"class.std::__1::unique_lock"* %__lk, i64 0, i32 0
+  store %"class.std::__1::mutex"* %__mut_, %"class.std::__1::mutex"** %__m_.i.i, align 8, !tbaa !0
+  %__owns_.i.i = getelementptr inbounds %"class.std::__1::unique_lock"* %__lk, i64 0, i32 1
+  store i8 1, i8* %__owns_.i.i, align 8, !tbaa !3
+  call void @_ZNSt3__15mutex4lockEv(%"class.std::__1::mutex"* %__mut_) #4
+  invoke void @_ZNSt3__117__assoc_sub_state10__sub_waitERNS_11unique_lockINS_5mutexEEE(%"class.std::__1::__assoc_sub_state"* %this, %"class.std::__1::unique_lock"* %__lk) #4
+          to label %invoke.cont unwind label %lpad
+
+invoke.cont:                                      ; preds = %entry
+  %__exception_ = getelementptr inbounds %"class.std::__1::__assoc_sub_state"* %this, i64 0, i32 1
+  %0 = bitcast { i64, i64 }* %tmp to i8*
+  call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 16, i32 8, i1 false)
+  call void @_ZNSt15__exception_ptr13exception_ptrC1EMS0_FvvE(%"class.std::__exception_ptr::exception_ptr"* %ref.tmp, { i64, i64 }* byval %tmp) #5
+  %call = call zeroext i1 @_ZNSt15__exception_ptrneERKNS_13exception_ptrES2_(%"class.std::__exception_ptr::exception_ptr"* %__exception_, %"class.std::__exception_ptr::exception_ptr"* %ref.tmp) #5
+  call void @_ZNSt15__exception_ptr13exception_ptrD1Ev(%"class.std::__exception_ptr::exception_ptr"* %ref.tmp) #5
+  br i1 %call, label %if.then, label %if.end
+
+if.then:                                          ; preds = %invoke.cont
+  call void @_ZNSt15__exception_ptr13exception_ptrC1ERKS0_(%"class.std::__exception_ptr::exception_ptr"* %agg.tmp, %"class.std::__exception_ptr::exception_ptr"* %__exception_) #5
+  invoke void @_ZSt17rethrow_exceptionNSt15__exception_ptr13exception_ptrE(%"class.std::__exception_ptr::exception_ptr"* %agg.tmp) #6
+          to label %invoke.cont4 unwind label %lpad3
+
+invoke.cont4:                                     ; preds = %if.then
+  unreachable
+
+lpad:                                             ; preds = %entry
+  %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          cleanup
+  %2 = extractvalue { i8*, i32 } %1, 0
+  %3 = extractvalue { i8*, i32 } %1, 1
+  br label %ehcleanup
+
+lpad3:                                            ; preds = %if.then
+  %4 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          cleanup
+  %5 = extractvalue { i8*, i32 } %4, 0
+  %6 = extractvalue { i8*, i32 } %4, 1
+  call void @_ZNSt15__exception_ptr13exception_ptrD1Ev(%"class.std::__exception_ptr::exception_ptr"* %agg.tmp) #5
+  br label %ehcleanup
+
+if.end:                                           ; preds = %invoke.cont
+  %7 = load i8* %__owns_.i.i, align 8, !tbaa !3, !range !4
+  %tobool.i.i = icmp eq i8 %7, 0
+  br i1 %tobool.i.i, label %_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit, label %if.then.i.i
+
+if.then.i.i:                                      ; preds = %if.end
+  %8 = load %"class.std::__1::mutex"** %__m_.i.i, align 8, !tbaa !0
+  call void @_ZNSt3__15mutex6unlockEv(%"class.std::__1::mutex"* %8) #5
+  br label %_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit
+
+_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit:      ; preds = %if.then.i.i, %if.end
+  ret void
+
+ehcleanup:                                        ; preds = %lpad3, %lpad
+  %exn.slot.0 = phi i8* [ %5, %lpad3 ], [ %2, %lpad ]
+  %ehselector.slot.0 = phi i32 [ %6, %lpad3 ], [ %3, %lpad ]
+  %9 = load i8* %__owns_.i.i, align 8, !tbaa !3, !range !4
+  %tobool.i.i9 = icmp eq i8 %9, 0
+  br i1 %tobool.i.i9, label %_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit12, label %if.then.i.i11
+
+if.then.i.i11:                                    ; preds = %ehcleanup
+  %10 = load %"class.std::__1::mutex"** %__m_.i.i, align 8, !tbaa !0
+  call void @_ZNSt3__15mutex6unlockEv(%"class.std::__1::mutex"* %10) #5
+  br label %_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit12
+
+_ZNSt3__111unique_lockINS_5mutexEED1Ev.exit12:    ; preds = %if.then.i.i11, %ehcleanup
+  %lpad.val = insertvalue { i8*, i32 } undef, i8* %exn.slot.0, 0
+  %lpad.val5 = insertvalue { i8*, i32 } %lpad.val, i32 %ehselector.slot.0, 1
+  resume { i8*, i32 } %lpad.val5
+}
+
+; Function Attrs: optsize
+declare void @_ZNSt3__117__assoc_sub_state10__sub_waitERNS_11unique_lockINS_5mutexEEE(%"class.std::__1::__assoc_sub_state"*, %"class.std::__1::unique_lock"*) #0 align 2
+
+; Function Attrs: nounwind optsize
+declare zeroext i1 @_ZNSt15__exception_ptrneERKNS_13exception_ptrES2_(%"class.std::__exception_ptr::exception_ptr"*, %"class.std::__exception_ptr::exception_ptr"*) #1
+
+; Function Attrs: nounwind optsize
+declare void @_ZNSt15__exception_ptr13exception_ptrC1EMS0_FvvE(%"class.std::__exception_ptr::exception_ptr"*, { i64, i64 }* byval) #1
+
+; Function Attrs: nounwind optsize
+declare void @_ZNSt15__exception_ptr13exception_ptrD1Ev(%"class.std::__exception_ptr::exception_ptr"*) #1
+
+; Function Attrs: noreturn optsize
+declare void @_ZSt17rethrow_exceptionNSt15__exception_ptr13exception_ptrE(%"class.std::__exception_ptr::exception_ptr"*) #2
+
+; Function Attrs: nounwind optsize
+declare void @_ZNSt15__exception_ptr13exception_ptrC1ERKS0_(%"class.std::__exception_ptr::exception_ptr"*, %"class.std::__exception_ptr::exception_ptr"*) #1
+
+; Function Attrs: nounwind optsize
+declare void @_ZNSt3__15mutex6unlockEv(%"class.std::__1::mutex"*) #1
+
+; Function Attrs: optsize
+declare void @_ZNSt3__15mutex4lockEv(%"class.std::__1::mutex"*) #0
+
+; Function Attrs: nounwind
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #3
+
+attributes #0 = { optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #2 = { noreturn optsize "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #3 = { nounwind }
+attributes #4 = { optsize }
+attributes #5 = { nounwind optsize }
+attributes #6 = { noreturn optsize }
+
+!0 = metadata !{metadata !"any pointer", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}
+!3 = metadata !{metadata !"bool", metadata !1}
+!4 = metadata !{i8 0, i8 2}