AN3350 datasheet(101/185 Pages) STMICROELECTRONICS

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AN3350

C compiler

Doc ID 018512 Rev 2

101/185

for (i = 0; i < size; ++i)

{

/* We expect to find the key rarely. */

if (__builtin_expect(array[i] == key, 0))

{

rescue(i);

}

12.3.12

Void return statements

When the GCC extensions setting is on, the compiler allows you to place expressions of

type void in a return statement.Example 46 shows an example.

Example 46 Returning void

void f(int a)

{

/* ... */

return; /* Always OK. */

}

void g(int b)

{

/* ... */

return f(b); /* Allowed when GCC extensions are on. */

}

12.3.13

Minimum and maximum operators

When the GCC extensions setting is on, the compiler recognizes built-in minimum (<?) and

maximum (>?) operators.

Example 47 Example of minimum and maximum operators

int a = 1 <? 2; // 1 is assigned to a.

int b = 1 >? 2; // 2 is assigned to b.

12.3.14

Local labels

When the GCC extensions setting is on, the compiler allows labels limited to a block’s

scope. A label declared with the __label__ keyword is visible only within the scope of its

enclosing block.Example 48 shows an example.

Example 48 Example of using local labels

void f(int i)

{

if (i >= 0)

{

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