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py: Shrink mp_arg_t struct by using reduced-size integer members. 

qstrs ids are restricted to fit within 2 bytes already (eg in persistent
bytecode) so it's safe to use a uint16_t to store them in mp_arg_t.  And
the flags member only needs a maximum of 2 bytes so can also use uint16_t.

Savings in code size can be significant when many mp_arg_t structs are
used for argument parsing.  Eg, this patch reduces stmhal by 480 bytes.
This commit is contained in:
Damien George 2016-09-23 12:13:51 +10:00
parent 46ab042230
commit e97df97600
1 changed files with 2 additions and 2 deletions
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4
py/runtime.h
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@ -52,8 +52,8 @@ typedef union _mp_arg_val_t {
} mp_arg_val_t;
typedef struct _mp_arg_t {
qstr qst;
mp_uint_t flags;
uint16_t qst;
uint16_t flags;
mp_arg_val_t defval;
} mp_arg_t;