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feat: add specialized LOAD_LOCAL_0..8 instructions to skip arg byte decode

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Introduce nine new bytecode instructions (CODE_LOAD_LOCAL_0 through CODE_LOAD_LOCAL_8) that directly encode the local slot number in the opcode itself, eliminating the need to read and decode a separate argument byte for the most frequently accessed local variables. This optimization targets the hottest path in the interpreter, as LOAD_LOCAL is the most executed instruction across benchmarks (e.g., 3.75M times in delta_blue). The compiler's `loadLocal` helper emits the specialized opcode when the slot index is ≤8, falling back to the generic `CODE_LOAD_LOCAL` with an argument byte otherwise. The VM dispatch table and debug printer are updated accordingly. Benchmarks show consistent speedups: fib +7.3%, method_call +5.9%, binary_trees +1.9%, for +2.8%, delta_blue +1.0%.
This commit is contained in:
Bob Nystrom
2014-12-07 03:59:11 +00:00
parent a665e14804
commit 520e841044
5 changed files with 174 additions and 34 deletions
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doc/instruction counts.txt
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This is the number of times each instruction was executed when running the
delta_blue benchmark:
3753021 CODE_LOAD_LOCAL
2233991 CODE_RETURN
2151580 CODE_LOAD_FIELD_THIS
2121398 CODE_CALL_1
1827535 CODE_CALL_0
1328364 CODE_POP
1136064 CODE_JUMP_IF
715071 CODE_LOAD_GLOBAL
428374 CODE_STORE_FIELD_THIS
424999 CODE_NULL
355344 CODE_STORE_LOCAL
341762 CODE_LOOP
118855 CODE_CONSTANT
93048 CODE_CALL_2
75280 CODE_AND
59920 CODE_JUMP
16842 CODE_LIST
16660 CODE_TRUE
10040 CODE_OR
8200 CODE_LOAD_UPVALUE
8140 CODE_SUPER_1
6540 CODE_FALSE
6076 CODE_STORE_GLOBAL
4000 CODE_SUPER_3
2020 CODE_SUPER_2
2000 CODE_SUPER_0
2000 CODE_CALL_5
2000 CODE_CALL_3
160 CODE_CLOSURE
74 CODE_METHOD_INSTANCE
11 CODE_CLASS
4 CODE_METHOD_STATIC
0 CODE_SUPER_9
0 CODE_SUPER_8
0 CODE_SUPER_7
0 CODE_SUPER_6
0 CODE_SUPER_5
0 CODE_SUPER_4
0 CODE_SUPER_16
0 CODE_SUPER_15
0 CODE_SUPER_14
0 CODE_SUPER_13
0 CODE_SUPER_12
0 CODE_SUPER_11
0 CODE_SUPER_10
0 CODE_STORE_UPVALUE
0 CODE_STORE_FIELD
0 CODE_LOAD_FIELD
0 CODE_IS
0 CODE_CLOSE_UPVALUE
0 CODE_CALL_9
0 CODE_CALL_8
0 CODE_CALL_7
0 CODE_CALL_6
0 CODE_CALL_4
0 CODE_CALL_16
0 CODE_CALL_15
0 CODE_CALL_14
0 CODE_CALL_13
0 CODE_CALL_12
0 CODE_CALL_11
0 CODE_CALL_10