Thread: variable stored in register or not ???

  1. 11-03-2009 #1
    dhondi
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    Question variable stored in register or not ???

    I stumbled at an assignment that

    "How do we get to know whether variable stored in register or not, programmatically ?"

    Please give me any idea, If anyone already done this one.

    Thanks in Advance
    Srikanth Dhondi
    Last edited by dhondi; 11-03-2009 at 12:29 PM.
  2. 11-03-2009 #2
    brewbuck
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    Quote Originally Posted by dhondi View Post
    I know how to use storage classes well, I have an assignment that

    "How do we get to know whether variable stored in register or not, programmatically ?"

    Thanks in Advance
    Srikanth Dhondi
    You don't have any way of knowing that. What does "programmatically" mean in this context?
    Code:
    //try
//{
	if (a) do { f( b); } while(1);
	else   do { f(!b); } while(1);
//}
  3. 11-03-2009 #3
    Subsonics
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    There is a storage class specifier called register, but as far as I know that only works as a suggestion for the compiler, ie it may not be stored in a register anyway.
  4. 11-03-2009 #4
    Elysia
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    The only way of knowing it is looking at the assembly of the compiled code. It is impossible to do programatically, if it means finding out so via code. Remember that C knows nothing about the process architecture or its registers. It is simply a high-level language that is translated into instructions for the cpu.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
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