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py/parse: Add support for math module constants and float folding.

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Add a new MICROPY_COMP_CONST_FLOAT feature, enabled by in mpy-cross and
when compiling with MICROPY_CONFIG_ROM_LEVEL_CORE_FEATURES.  The new
feature leverages the code of MICROPY_COMP_CONST_FOLDING to support folding
of floating point constants.

If MICROPY_COMP_MODULE_CONST is defined as well, math module constants are
made available at compile time. For example:

    _DEG_TO_GRADIANT = const(math.pi / 180)
    _INVALID_VALUE = const(math.nan)

A few corner cases had to be handled:
- The float const folding code should not fold expressions resulting into
  complex results, as the mpy parser for complex immediates has
  limitations.
- The constant generation code must distinguish between -0.0 and 0.0, which
  are different even if C consider them as ==.

This change removes previous limitations on the use of `const()`
expressions that would result in floating point number, so the test cases
of micropython/const_error have to be updated.

Additional test cases have been added to cover the new repr() code (from a
previous commit).  A few other simple test cases have been added to handle
the use of floats in `const()` expressions, but the float folding code
itself is also tested when running general float test cases, as float
expressions often get resolved at compile-time (with this change).

Signed-off-by: Yoctopuce dev <dev@yoctopuce.com>
This commit is contained in:
Yoctopuce dev
2025-01-28 00:26:08 +01:00
committed by Damien George
parent f67a370311
commit 69ead7d98e
12 changed files with 144 additions and 32 deletions
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4
mpy-cross/mpconfigport.h
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@@ -55,6 +55,7 @@
#define MICROPY_COMP_CONST_FOLDING (1)
#define MICROPY_COMP_MODULE_CONST (1)
#define MICROPY_COMP_CONST (1)
#define MICROPY_COMP_CONST_FLOAT (1)
#define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (1)
#define MICROPY_COMP_TRIPLE_TUPLE_ASSIGN (1)
#define MICROPY_COMP_RETURN_IF_EXPR (1)
@@ -88,7 +89,8 @@
#define MICROPY_PY_ARRAY (0)
#define MICROPY_PY_ATTRTUPLE (0)
#define MICROPY_PY_COLLECTIONS (0)
#define MICROPY_PY_MATH (0)
#define MICROPY_PY_MATH (MICROPY_COMP_CONST_FLOAT)
#define MICROPY_PY_MATH_CONSTANTS (MICROPY_COMP_CONST_FLOAT)
#define MICROPY_PY_CMATH (0)
#define MICROPY_PY_GC (0)
#define MICROPY_PY_IO (0)