The GNU Fortran Compiler: MCLOCK8

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### 9.185 `MCLOCK8` — Time function (64-bit)

Description:

  Returns the number of clock ticks since the start of the process, based on the function `clock(3)` in the C standard library.

  Warning: this intrinsic does not increase the range of the timing values over that returned by `clock(3)`. On a system with a 32-bit `clock(3)`, `MCLOCK8` will return a 32-bit value, even though it is converted to a 64-bit `INTEGER(8)` value. That means overflows of the 32-bit value can still occur. Therefore, the values returned by this intrinsic might be or become negative or numerically less than previous values during a single run of the compiled program.

Standard:

  GNU extension

Class:

  Function

Syntax:

  `RESULT = MCLOCK8()`

Return value:

  The return value is a scalar of type `INTEGER(8)`, equal to the number of clock ticks since the start of the process, or `-1` if the system does not support `clock(3)`.

See also:

  CTIME, GMTIME, LTIME, MCLOCK, TIME8