(tso_size_w - BLOCKS_PER_MBLOCK*BLOCK_SIZE_W) % MBLOCK_SIZE_W != 0 ||
// or TSO is not a whole number of megablocks (ensuring
// precondition of splitLargeBlock() below)
+ (tso_size_w <= round_up_to_mblocks(RtsFlags.GcFlags.initialStkSize)) ||
+ // or TSO is smaller than the minimum stack size (rounded up)
(nat)(tso->stack + tso->stack_size - tso->sp) > tso->stack_size / 4)
// or stack is using more than 1/4 of the available space
{