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bug#45562: [PATCH] Fix "comparison always the same" warnings found by lg
From: |
Daniel Martín |
Subject: |
bug#45562: [PATCH] Fix "comparison always the same" warnings found by lgtm |
Date: |
Fri, 01 Jan 2021 12:37:43 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (darwin) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> Eli Zaretskii <eliz@gnu.org> writes:
>
>>> --- a/src/alloc.c
>>> +++ b/src/alloc.c
>>> @@ -4001,7 +4001,7 @@ memory_full (size_t nbytes)
>>> {
>>> if (i == 0)
>>> free (spare_memory[i]);
>>> - else if (i >= 1 && i <= 4)
>>> + else if (i <= 4)
>>> lisp_align_free (spare_memory[i]);
>>> else
>>> lisp_free (spare_memory[i]);
>>
>> This is an optimization better left to the compiler, IMO.
>
> I think the change made the code slightly clearer, though? You don't
> have to think about whether there's anything in the range between 0 and
>>= 1.
I think it depends on the programmer. To me, the original code makes
more clear that the branch runs when i is in the [1..4] range, in a
mathematical sense.