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From: Bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: how cast works?
Date: Sat, 10 Aug 2024 17:14:19 +0100
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In-Reply-To: <v97p5g$lfau$1@dont-email.me>

On 10/08/2024 14:15, Thiago Adams wrote:
> Em 8/10/2024 7:17 AM, Bart escreveu:
>> On 09/08/2024 21:01, David Brown wrote:
>>> On 09/08/2024 20:54, Thiago Adams wrote:
>>
>>> I don't know what you are referring to here.  But if you are using 
>>> compiler explorer, I encourage you to look at the generated output 
>>> for a wide range of targets, including 8-bit AVR, 16-bit MSP430, 
>>> 32-bit ARM, and 64-bit x86.  Use gcc -O1 or -O2 in every case.
>>
>> When would you choose -O2 over -O1 or vice versa? Could a similar 
>> circumstance cause you to choose -O0? Why not -O3?
>>
>> In fact, why is there a -O0 option at all?
>>
>>    (Ignore Bart's
>>> ignorant blatherings about optimisation.)
>>
>> [To TA:]
>>
>> Yes do. But don't complaint to me when your test code results in 
>> meaningless or misleading output, or no output at all.
>>
>> Actually, I would recommend looking at both (eg. -O0 and -O1) so that 
>> you can see if the compiler's optimiser has been over-zealous in 
>> eliminating code, or has chopped out key bits, so that you might 
>> modify your test code.
>>
>> I would recommend also looking at the Tiny C option on godbolt when 
>> comparing x86 code.
>>
> 
> 
> 
> Bart, Does your compiler support the `bool` type, where the value is 
> always either 1 or 0?

There is a bool type, but it is treated like unsigned char, so is 
non-conforming.