Renesas TM V.3.20A Especificaciones descargar pdf (Pagina 238)

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Renesas Technology, Tools FAQs

Last Updated: February 4, 2000

Document Number: 01051081_e

When I include several floating-point constants in an expression in C program, sometimes the constants are not combined to a

constant during the compile? Why not?

The compiler tries to determine whether the constant expression can be replaced by a constant according to the arithmetic operation

order. In the floating decimal operation, the deviation may change due to rounding, therefore the compiler can not change the order

of the operations on its own.

For example, if deg is the int form variable, the expression deg * 3.14/180 can not be changed to constant deg * 3.14 and, as a result,

the instruction for this operation is generated (in other words, it can not be replaced by a constant). On the other hand, an expression

like 3.14/180 * deg can become constant 3.14/180, and the operation is executed and the expression is replaced by a constant.

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Renesas TM V.3.20A Especificaciones Pagina 238

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