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cisnan() warnings fix (#1008) 

* Fix cisnan() macro warnings (strict-aliasing)

* Hey, we found a bug thanks to our fix! Let's fix it too!
This commit is contained in:
andreika-git 2019-11-17 15:08:57 +02:00 committed by rusefi
parent 6456374eb8
commit 9f33df9574
2 changed files with 14 additions and 1 deletions
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12
firmware/util/efilib.h
View File

@ -45,7 +45,19 @@ int indexOf(const char *string, char ch);
float atoff(const char *string);
int atoi(const char *string);
#if defined(__cplusplus) && defined(__OPTIMIZE__)
#include <type_traits>
// "g++ -O2" version, adds more strict type check and yet no "strict-aliasing" warnings!
#define cisnan(f) ({ \
static_assert(sizeof(f) == sizeof(int32_t)); \
union cisnanu_t { std::remove_reference_t<decltype(f)> __f; int32_t __i; } __cisnan_u = { f }; \
__cisnan_u.__i == 0x7FC00000; \
})
#else
// "g++ -O0" or other C++/C compilers
#define cisnan(f) (*(((int*) (&f))) == 0x7FC00000)
#endif /* __cplusplus && __OPTIMIZE__ */
#define UNUSED(x) (void)(x)
int absI(int32_t value);

3
firmware/util/math/interpolation.h
View File

@ -46,7 +46,8 @@ int needInterpolationLogging(void);
*/
template<typename kType>
int findIndexMsgExt(const char *msg, const kType array[], int size, kType value) {
if (cisnan(value)) {
float fvalue = (float)value;
if (cisnan(fvalue)) {
firmwareError(ERROR_NAN_FIND_INDEX, "NaN in findIndex%s", msg);
return 0;
}