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Is there any Fortran keyword equivalent to the C "inline" keyword?
If some compiler-specific keyword exist, is there any for gfortran?
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1) Function call overhead doesn't occur. 2) It also saves the overhead of push/pop variables on the stack when function is called. 3) It also saves overhead of a return call from a function. 4) When you inline a function, you may enable compiler to perform context specific optimization on the body of function.
They are started with a line that includes the type of value the function will return, the function name, and the list of arguments the function takes as inputs. Any variables the function uses, including the arguments, must be declared in the function right after the first line.
Variable names in Fortran consist of 1-6 characters chosen from the letters a-z and the digits 0-9.
In general, the Fortran specifications grant the compiler writers enormous scope in how to implement things, so a language-level construct that forced (or even hinted) specific optimizations would be very un-Fortran-y.
What you typically do in modern Fortran is not specify optimizations, but tell the compiler things it can use to decide what optimizations to implement. So an example is labelling a side-effect-free function or subroutine PURE, so that certain optimizations are enabled (and actually, this may make for easier inlining).
Otherwise, as @Vladimir F points out, you can use compiler options which are presecriptive in this way.
In a similar vein, it seems that CONTAINed subprogram are more aggressively inlined by gfortran, but that may or may not help.
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There is no source code statement I know of. Sometimes you can use statement functions, which are obviously inlined. Otherwise use compiler comand line options as gfortran's "-finline-functions".
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