py/modmath: Work around msvc float bugs in atan2, fmod and modf.
Older implementations deal with infinity/negative zero incorrectly. This
commit adds generic fixes that can be enabled by any port that needs them,
along with new tests cases.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index f2b3af1..27df3f4 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -1128,6 +1128,21 @@
#define MICROPY_PY_MATH_ISCLOSE (0)
#endif
+// Whether to provide fix for atan2 Inf handling.
+#ifndef MICROPY_PY_MATH_ATAN2_FIX_INFNAN
+#define MICROPY_PY_MATH_ATAN2_FIX_INFNAN (0)
+#endif
+
+// Whether to provide fix for fmod Inf handling.
+#ifndef MICROPY_PY_MATH_FMOD_FIX_INFNAN
+#define MICROPY_PY_MATH_FMOD_FIX_INFNAN (0)
+#endif
+
+// Whether to provide fix for modf negative zero handling.
+#ifndef MICROPY_PY_MATH_MODF_FIX_NEGZERO
+#define MICROPY_PY_MATH_MODF_FIX_NEGZERO (0)
+#endif
+
// Whether to provide "cmath" module
#ifndef MICROPY_PY_CMATH
#define MICROPY_PY_CMATH (0)