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py: Replace POP_BLOCK and POP_EXCEPT opcodes with POP_EXCEPT_JUMP.

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POP_BLOCK and POP_EXCEPT are now the same, and are always followed by a
JUMP.  So this optimisation reduces code size, and RAM usage of bytecode by
two bytes for each try-except handler.
This commit is contained in:
Damien George
2019-02-15 12:18:59 +11:00
parent 6f9e3ff719
commit 5a2599d962
11 changed files with 35 additions and 65 deletions
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11
py/showbc.c
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@@ -401,14 +401,9 @@ const byte *mp_bytecode_print_str(const byte *ip) {
printf("FOR_ITER " UINT_FMT, (mp_uint_t)(ip + unum - mp_showbc_code_start));
break;
case MP_BC_POP_BLOCK:
// pops block and restores the stack
printf("POP_BLOCK");
break;
case MP_BC_POP_EXCEPT:
// pops block, checks it's an exception block, and restores the stack, saving the 3 exception values to local threadstate
printf("POP_EXCEPT");
case MP_BC_POP_EXCEPT_JUMP:
DECODE_ULABEL; // these labels are always forward
printf("POP_EXCEPT_JUMP " UINT_FMT, (mp_uint_t)(ip + unum - mp_showbc_code_start));
break;
case MP_BC_BUILD_TUPLE: