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1; RUN: llc -mtriple=x86_64 < %s2 3declare ptr @llvm_gc_allocate(i32)4declare void @llvm_gc_initialize(i32)5 6declare void @llvm.gcroot(ptr, ptr)7declare void @llvm.gcwrite(ptr, ptr, ptr)8 9define i32 @main() gc "shadow-stack" {10entry:11 %A = alloca ptr12 %B = alloca ptr13 14 call void @llvm_gc_initialize(i32 1048576) ; Start with 1MB heap15 16 ;; ptr A;17 call void @llvm.gcroot(ptr %A, ptr null)18 19 ;; A = gcalloc(10);20 %Aptr = call ptr @llvm_gc_allocate(i32 10)21 store ptr %Aptr, ptr %A22 23 ;; ptr B;24 call void @llvm.gcroot(ptr %B, ptr null)25 26 ;; B = gcalloc(4);27 %B.upgrd.1 = call ptr @llvm_gc_allocate(i32 8)28 store ptr %B.upgrd.1, ptr %B29 30 ;; *B = A;31 %B.1 = load ptr, ptr %B32 %A.1 = load ptr, ptr %A33 call void @llvm.gcwrite(ptr %A.1, ptr %B.upgrd.1, ptr %B.1)34 35 br label %AllocLoop36 37AllocLoop:38 %i = phi i32 [ 0, %entry ], [ %indvar.next, %AllocLoop ]39 ;; Allocated mem: allocated memory is immediately dead.40 call ptr @llvm_gc_allocate(i32 100)41 42 %indvar.next = add i32 %i, 143 %exitcond = icmp eq i32 %indvar.next, 1000000044 br i1 %exitcond, label %Exit, label %AllocLoop45 46Exit:47 ret i32 048}49 50declare void @__main()51