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Re: Stack space and declarations

From: Andreas Pfeil <ap at rsise dot anu dot edu dot au>
To: VÃclav Haisman <V dot Haisman at sh dot cvut dot cz>
Cc: gcc-help at gcc dot gnu dot org
Date: Fri, 16 Dec 2005 14:04:58 +1100
Subject: Re: Stack space and declarations
References: <43A1FF80.7080602@sh.cvut.cz>

Hi,

which architecture are you talking about? On PowerPC, if none of the variables are marked volatile, then probably no stack space will be allocated for the variables. This depends on the ABI of the processor, I'd believe.

Cheers,
Andreas

VÃclav Haisman wrote:

Hi,
first some C code:

void foo (int x)
{
  int y = 0;
  if (x) {
    int z = 0;
    // some more code
  }
  else {
    int w = 0;
    // some more code
  }
}

Now, how much stack space is getting allocated in the function? Is it
(assuming 32bit architecture) 2*4=8 bytes (y + (z or w)) or is it 3*4=12
(each variable gets its own slot)?

Vaclav Haisman

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