testing - C++ Is there a guarantee of constancy of untouched float values? -



testing - C++ Is there a guarantee of constancy of untouched float values? -

i know if can assume value of float not alter if pass around functions, without farther calculations. write tests kind of functions using hardcoded values.

example :

float identity(float f) { homecoming f; }

can write next test :

test() { expect(identity(1.8f) == 1.8f); }

in general c++ standard doesn't create guarantees if it's known guarantee lead sub-optimal code processor architecture.

the legacy x86 floating point processing uses 80-bit registers calculations. mere deed of moving value 1 of registers 64 bits of memory causes rounding occur.

c++ testing

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