mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-04 00:48:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

bpo-44900: Add five superinstructions. (GH-27741)

Browse source 
* LOAD_FAST LOAD_FAST
* STORE_FAST LOAD_FAST
* LOAD_FAST LOAD_CONST
* LOAD_CONST LOAD_FAST
* STORE_FAST STORE_FAST
This commit is contained in:
Mark Shannon 2021-08-16 12:23:13 +01:00 • committed by GitHub
parent 1a511dc92d
commit 4f51fa9e2d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 133 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

29
Python/specialize.c
View file

@ -303,6 +303,7 @@ optimize(SpecializedCacheOrInstruction *quickened, int len)
_Py_CODEUNIT *instructions = first_instruction(quickened);
int cache_offset = 0;
int previous_opcode = -1;
int previous_oparg = 0;
for(int i = 0; i < len; i++) {
int opcode = _Py_OPCODE(instructions[i]);
int oparg = _Py_OPARG(instructions[i]);
@ -338,14 +339,32 @@ optimize(SpecializedCacheOrInstruction *quickened, int len)
case JUMP_ABSOLUTE:
instructions[i] = _Py_MAKECODEUNIT(JUMP_ABSOLUTE_QUICK, oparg);
break;
/* Insert superinstructions here
E.g.
case LOAD_FAST:
if (previous_opcode == LOAD_FAST)
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_FAST, oparg);
*/
switch(previous_opcode) {
case LOAD_FAST:
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_FAST, previous_oparg);
break;
case STORE_FAST:
instructions[i-1] = _Py_MAKECODEUNIT(STORE_FAST__LOAD_FAST, previous_oparg);
break;
case LOAD_CONST:
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_CONST__LOAD_FAST, previous_oparg);
break;
}
break;
case STORE_FAST:
if (previous_opcode == STORE_FAST) {
instructions[i-1] = _Py_MAKECODEUNIT(STORE_FAST__STORE_FAST, previous_oparg);
}
break;
case LOAD_CONST:
if (previous_opcode == LOAD_FAST) {
instructions[i-1] = _Py_MAKECODEUNIT(LOAD_FAST__LOAD_CONST, previous_oparg);
}
break;
}
previous_opcode = opcode;
previous_oparg = oparg;
}
}
assert(cache_offset+1 == get_cache_count(quickened));