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Thomas Harte 2019-07-23 23:03:15 -04:00
parent d69aee4972
commit 4aca6c5ef8
1 changed files with 8 additions and 0 deletions
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Processors/68000/Implementation/68000Storage.hpp
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@ -334,6 +334,14 @@ class ProcessorStorage {
A program represents the implementation of a particular opcode, as a sequence
of micro-ops and, separately, the operation to perform plus whatever other
fields the operation requires.
TODO: this struct, as currently formed, is 48 bytes large on my 64-bit Intel
machine — 8 bytes for each of the pointers, plus 8 bytes for the non-pointer fields.
That means that the Program[65536] table is 3mb large. Far too huge for a cache.
So slim this, even if it makes things much more painful to dereference.
(Aside: the compiler seems to prefer 8-byte alignment so eliminating or slimming the
non-pointer fields doesn't seem to be helpful immediately.)
*/
struct Program {
MicroOp *micro_operations = nullptr;