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  • Rules removed from the original MISRA rules

This is the HCC Embedded Product Documentation.

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The following rules are removed from the original MISRA rules:

1.3Multiple compilers and/or languages shall only be used if there is a common defined interface standard for object code to
which the language/compilers/assemblers conform.

1.3 is not applicable. We do not use multiple languages but just C.


1.5Floating-point implementations should comply with a defined floating-point standard.
10.2The value of an expression of floating type shall not be implicitly converted to a different underlying type if:
a. it is not a conversion to a wider floating type, or
b. the expression is complex, or
c. the expression is a function argument, or
d. the expression is a return expression.
10.4The value of a complex expression of floating type shall only be cast to a floating type which is narrower or of the same size.
12.12The underlying bit representations of floating-point values shall not be used.
13.3Floating-point expressions shall not be tested for equality or inequality.
13.4The controlling expression of a for statement shall not contain any objects of floating type.

1.5, 10.2, 10.4, 12.12, 13.3, 13.4 are not applicable – we do not use floating point arithmetic (C29).


3.5If it is being relied upon, the implementation-defined behavior and packing of bit fields shall be documented.
6.4Bit fields shall only be defined to be of type unsigned int or signed int.
6.5Bit fields of signed type shall be at least two bits long.

HCC rule C10 and C37 give a more disciplined way of using the bit fields.