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py/obj: Add MICROPY_OBJ_IMMEDIATE_OBJS option to reduce code size.

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This option (enabled by default for object representation A, B, C) makes
None/False/True objects immediate objects, ie they are no longer a concrete
object in ROM but are rather just values, eg None=0x6 for representation A.

Doing this saves a considerable amount of code size, due to these objects
being widely used:

   bare-arm:  -392 -0.591%
minimal x86:  -252 -0.170% [incl +52(data)]
   unix x64:  -624 -0.125% [incl -128(data)]
unix nanbox:    +0 +0.000%
      stm32: -1940 -0.510% PYBV10
     cc3200: -1216 -0.659%
    esp8266:  -404 -0.062% GENERIC
      esp32:  -732 -0.064% GENERIC[incl +48(data)]
        nrf:  -988 -0.675% pca10040
       samd:  -564 -0.556% ADAFRUIT_ITSYBITSY_M4_EXPRESS

Thanks go to @Jongy aka Yonatan Goldschmidt for the idea.
This commit is contained in:
Damien George
2020-01-09 00:00:27 +11:00
parent 6f0c83f6e1
commit d96cfd13e3
5 changed files with 59 additions and 12 deletions
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7
py/mpconfig.h
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@@ -113,6 +113,13 @@
#define MICROPY_OBJ_REPR (MICROPY_OBJ_REPR_A)
#endif
// Whether to encode None/False/True as immediate objects instead of pointers to
// real objects. Reduces code size by a decent amount without hurting
// performance, for all representations except D on some architectures.
#ifndef MICROPY_OBJ_IMMEDIATE_OBJS
#define MICROPY_OBJ_IMMEDIATE_OBJS (MICROPY_OBJ_REPR != MICROPY_OBJ_REPR_D)
#endif
/*****************************************************************************/
/* Memory allocation policy */