Is the below code it (from rts/PrimOps.cmm)? Does it being in PrimOps.cmm mean that it's always out-of-line? stg_newArrayzh ( W_ n /* words */, gcptr init ) { W_ words, size; gcptr p, arr; again: MAYBE_GC(again); // the mark area contains one byte for each 2^MUT_ARR_PTRS_CARD_BITS words // in the array, making sure we round up, and then rounding up to a whole // number of words. size = n + mutArrPtrsCardWords(n); words = BYTES_TO_WDS(SIZEOF_StgMutArrPtrs) + size; ("ptr" arr) = ccall allocate(MyCapability() "ptr",words); TICK_ALLOC_PRIM(SIZEOF_StgMutArrPtrs, WDS(n), 0); SET_HDR(arr, stg_MUT_ARR_PTRS_DIRTY_info, CCCS); StgMutArrPtrs_ptrs(arr) = n; StgMutArrPtrs_size(arr) = size; // Initialise all elements of the the array with the value in R2 p = arr + SIZEOF_StgMutArrPtrs; for: if (p < arr + WDS(words)) { W_[p] = init; p = p + WDS(1); goto for; } // Initialise the mark bits with 0 for2: if (p < arr + WDS(size)) { W_[p] = 0; p = p + WDS(1); goto for2; } return (arr); }