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Smarter MIN, MAX, ABS macros

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Use macros that explicitly avoid double-evaluation and can be used for any datatype, replacing `min`, `max`, `abs`, `fabs`, `labs`, and `FABS`.

Co-Authored-By: ejtagle <ejtagle@hotmail.com>
This commit is contained in:
Scott Lahteine
2018-05-13 01:10:34 -05:00
parent 083ec9963e
commit 99ecdf59af
52 changed files with 206 additions and 247 deletions
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51
Marlin/src/core/macros.h
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@ -113,7 +113,7 @@
#define DECIMAL_SIGNED(a) (DECIMAL(a) || (a) == '-' || (a) == '+')
#define COUNT(a) (sizeof(a)/sizeof(*a))
#define ZERO(a) memset(a,0,sizeof(a))
#define COPY(a,b) memcpy(a,b,min(sizeof(a),sizeof(b)))
#define COPY(a,b) memcpy(a,b,MIN(sizeof(a),sizeof(b)))
// Macros for initializing arrays
#define ARRAY_6(v1, v2, v3, v4, v5, v6, ...) { v1, v2, v3, v4, v5, v6 }
@ -164,12 +164,48 @@
#define CEILING(x,y) (((x) + (y) - 1) / (y))
#define MIN3(a, b, c) min(min(a, b), c)
#define MIN4(a, b, c, d) min(MIN3(a, b, c), d)
#define MIN5(a, b, c, d, e) min(MIN4(a, b, c, d), e)
#define MAX3(a, b, c) max(max(a, b), c)
#define MAX4(a, b, c, d) max(MAX3(a, b, c), d)
#define MAX5(a, b, c, d, e) max(MAX4(a, b, c, d), e)
// Avoid double evaluation of arguments on MIN/MAX/ABS
#undef MIN
#undef MAX
#undef ABS
#ifdef __cplusplus
// C++11 solution that is standards compliant. Return type is deduced automatically
template <class L, class R> static inline constexpr auto MIN(const L lhs, const R rhs) -> decltype(lhs + rhs) {
return lhs < rhs ? lhs : rhs;
}
template <class L, class R> static inline constexpr auto MAX(const L lhs, const R rhs) -> decltype(lhs + rhs){
return lhs > rhs ? lhs : rhs;
}
template <class T> static inline constexpr const T ABS(const T v) {
return v >= 0 ? v : -v;
}
#else
// Using GCC extensions, but Travis GCC version does not like it and gives
// "error: statement-expressions are not allowed outside functions nor in template-argument lists"
#define MIN(a, b) \
({__typeof__(a) _a = (a); \
__typeof__(b) _b = (b); \
_a < _b ? _a : _b;})
#define MAX(a, b) \
({__typeof__(a) _a = (a); \
__typeof__(b) _b = (b); \
_a > _b ? _a : _b;})
#define ABS(a) \
({__typeof__(a) _a = (a); \
_a >= 0 ? _a : -_a;})
#endif
#define MIN3(a, b, c) MIN(MIN(a, b), c)
#define MIN4(a, b, c, d) MIN(MIN3(a, b, c), d)
#define MIN5(a, b, c, d, e) MIN(MIN4(a, b, c, d), e)
#define MAX3(a, b, c) MAX(MAX(a, b), c)
#define MAX4(a, b, c, d) MAX(MAX3(a, b, c), d)
#define MAX5(a, b, c, d, e) MAX(MAX4(a, b, c, d), e)
#define UNEAR_ZERO(x) ((x) < 0.000001)
#define NEAR_ZERO(x) WITHIN(x, -0.000001, 0.000001)
@ -182,7 +218,6 @@
// Maths macros that can be overridden by HAL
//
#define ATAN2(y, x) atan2(y, x)
#define FABS(x) fabs(x)
#define POW(x, y) pow(x, y)
#define SQRT(x) sqrt(x)
#define CEIL(x) ceil(x)