diff options
| author | Jeff Epler <jepler@gmail.com> | 2020-11-24 10:26:47 -0600 |
|---|---|---|
| committer | Jeff Epler <jepler@gmail.com> | 2020-11-24 16:54:33 -0600 |
| commit | c451b22255706989f58cfd88be486e5117979a28 (patch) | |
| tree | b448e050ae2175d4f6ede3fc04efa58e6620b300 | |
| parent | bafa0501d17eb55726a8decfe19d6f055190d6b1 (diff) | |
Disable 3-arg pow() function on m0 boards
`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.
| -rw-r--r-- | ports/atmel-samd/mpconfigport.mk | 4 | ||||
| -rw-r--r-- | py/circuitpy_mpconfig.h | 2 | ||||
| -rw-r--r-- | py/circuitpy_mpconfig.mk | 3 |
3 files changed, 8 insertions, 1 deletions
diff --git a/ports/atmel-samd/mpconfigport.mk b/ports/atmel-samd/mpconfigport.mk index 1929e146d..17e3995bf 100644 --- a/ports/atmel-samd/mpconfigport.mk +++ b/ports/atmel-samd/mpconfigport.mk @@ -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 diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h index 85e152670..28fd4095c 100644 --- a/py/circuitpy_mpconfig.h +++ b/py/circuitpy_mpconfig.h @@ -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) diff --git a/py/circuitpy_mpconfig.mk b/py/circuitpy_mpconfig.mk index a6aabec33..08e773718 100644 --- a/py/circuitpy_mpconfig.mk +++ b/py/circuitpy_mpconfig.mk @@ -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) |