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Disable 3-arg pow() function on m0 boards

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`pow(a, b, c)` can compute `(a ** b) % c` efficiently (in time and memory).
This can be useful for extremely specific applications, like implementing
the RSA cryptosystem.  For typical uses of CircuitPython, this is not an
important feature.  A survey of the bundle and learn system didn't find
any uses.

Disable it on M0 builds so that we can fit in needed upgrades to the USB
stack.
This commit is contained in:
Jeff Epler 2020-11-24 10:26:47 -06:00
parent bafa0501d1
commit c451b22255
3 changed files with 8 additions and 1 deletions
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4
ports/atmel-samd/mpconfigport.mk
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@ -29,6 +29,10 @@ ifndef CIRCUITPY_AUDIOMP3
CIRCUITPY_AUDIOMP3 = 0
endif
ifndef CIRCUITPY_BUILTINS_POW3
CIRCUITPY_BUILTINS_POW3 = 0
endif
ifndef CIRCUITPY_FREQUENCYIO
CIRCUITPY_FREQUENCYIO = 0
endif

2
py/circuitpy_mpconfig.h
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@ -184,7 +184,7 @@ typedef long mp_off_t;
// Turning off FULL_BUILD removes some functionality to reduce flash size on tiny SAMD21s
#define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (CIRCUITPY_FULL_BUILD)
#define MICROPY_CPYTHON_COMPAT (CIRCUITPY_FULL_BUILD)
#define MICROPY_PY_BUILTINS_POW3 (CIRCUITPY_FULL_BUILD)
#define MICROPY_PY_BUILTINS_POW3 (CIRCUITPY_BUILTINS_POW3)
#define MICROPY_COMP_FSTRING_LITERAL (MICROPY_CPYTHON_COMPAT)
#define MICROPY_MODULE_WEAK_LINKS (0)
#define MICROPY_PY_ALL_SPECIAL_METHODS (CIRCUITPY_FULL_BUILD)

3
py/circuitpy_mpconfig.mk
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@ -90,6 +90,9 @@ CFLAGS += -DCIRCUITPY_BLEIO=$(CIRCUITPY_BLEIO)
CIRCUITPY_BOARD ?= 1
CFLAGS += -DCIRCUITPY_BOARD=$(CIRCUITPY_BOARD)
CIRCUITPY_BUILTINS_POW3 ?= $(CIRCUITPY_FULL_BUILD)
CFLAGS += -DCIRCUITPY_BUILTINS_POW3=$(CIRCUITPY_BUILTINS_POW3)
CIRCUITPY_BUSIO ?= 1
CFLAGS += -DCIRCUITPY_BUSIO=$(CIRCUITPY_BUSIO)