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From: robison@uiucdcsb.CS.UIUC.EDU
Newsgroups: net.lang.c
Subject: Re: Stack frames
Message-ID: <139200021@uiucdcsb>
Date: Mon, 17-Feb-86 11:44:00 EST
Article-I.D.: uiucdcsb.139200021
Posted: Mon Feb 17 11:44:00 1986
Date-Received: Wed, 19-Feb-86 00:58:10 EST
References: <463@ur-helheim.UUCP>
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Nf-ID: #R:ur-helheim.UUCP:463:uiucdcsb:139200021:000:481
Nf-From: uiucdcsb.CS.UIUC.EDU!robison    Feb 17 10:44:00 1986


The output from C compilers I have seen indicates there is no penalty for
{} blocks with declarations.  All allocation can be done at the function entry.
I.e., the source code:

     int f(x,y)
        int x,y;
	{
           int a,b;
	   ...
	   {
	      int m,n;
	      ...
	   } 
	   ...
	}

generates assembly code which allocates a,b,m, and n on the stack upon entry.
The only difference between a,b and m,n is that m,n is visible
only within the inner block.

- Arch Robison