GCC 5
GCC 5
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4.6. Floating Point

4.6 Floating Point

  • The accuracy of the floating-point operations and of the library functions in <math.h> and <complex.h> that return floating-point results (C90, C99 and C11 5.2.4.2.2).

    The accuracy is unknown.

  • The rounding behaviors characterized by non-standard values of FLT_ROUNDS (C90, C99 and C11 5.2.4.2.2).

    GCC does not use such values.

  • The evaluation methods characterized by non-standard negative values of FLT_EVAL_METHOD (C99 and C11 5.2.4.2.2).

    GCC does not use such values.

  • The direction of rounding when an integer is converted to a floating-point number that cannot exactly represent the original value (C90 6.2.1.3, C99 and C11 6.3.1.4).

    C99 Annex F is followed.

  • The direction of rounding when a floating-point number is converted to a narrower floating-point number (C90 6.2.1