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Re: [avr-gcc-list] [Bug target/35634] New: [avr] result of char promotio

From: Rolf Ebert
Subject: Re: [avr-gcc-list] [Bug target/35634] New: [avr] result of char promotion comes out of CHAR_MIN/MAX
Date: Thu, 20 Mar 2008 09:41:52 +0100
User-agent: Thunderbird (Windows/20080213)

Dave N6NZ schrieb:

Dmitry K. wrote:

Now I can not understand, why the Standart permits
'undefined behavior' with ordinary overflow,

Well, checking for integer overflow can cause a lot of code to be generated on some architectures. That becomes both a space and performance issue. In general, the C standard favors fast and small over tightly defined results.

You might like Ada :)
Just kidding.

Due to the poor code that gcc generates for detecting overflow (on all platforms), overflow detection is swithced off by default in gcc-Ada. You really have to insist and know about the -gnato option to get a standard conforming Ada compiler.

For not getting completely off topic on the avr-gcc mailing list let me point out that integer overflow is signaled by an exception in Ada and exceptions are not (yet) supported in AVR-Ada.


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