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Why does GCC generate such radically different assembly for nearly the same C code?
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Updated to sync with the OP's edit
By tinkering with the code, I've managed to see how GCC optimizes the first case.
Before we can understand why they are so different, first we must understand how GCC optimizes fast_trunc_one().
Believe it or not, fast_t...
Create a pointer to two-dimensional array
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Beware of the pointer/array world in C, much confusion is around this.
Edit
Reviewing some of the other answers here, because the comment fields are too short to do there. Multiple alternatives were proposed, but it wasn't shown how they behave. Here is how they do
uint8_t (*matrix_ptr)[][20] ...
How can I use swift in Terminal?
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edited Oct 21 '14 at 15:25
answered Jun 3 '14 at 9:34
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How to .gitignore files recursively
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edited Jun 15 '17 at 23:55
Eric Leschinski
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How to convert Strings to and from UTF8 byte arrays in Java
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edited Feb 7 '19 at 10:53
Fokko Driesprong
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jQuery Validate Plugin - Trigger validation of single field
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edited Jan 15 '15 at 15:55
answered Aug 7 '12 at 0:41
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MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)
...this anonymous user (this is usually a good thing to do anyways).
Below edits are mostly irrelevant to the main question. These are only meant to answer some questions raised in other comments within this thread.
Edit 1
Authenticating as 'bill'@'%' through a socket.
root@myhost:/home/mys...
Auto-center map with multiple markers in Google Maps API v3
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edited May 23 '17 at 12:34
Community♦
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answered Mar 30 '13 a...
PHP mkdir: Permission denied problem
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edited Dec 31 '15 at 13:09
OnlyMAJ
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answe...
In Django, how do I check if a user is in a certain group?
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from django.contrib.auth.models import User, Group
group = Group(name = "Editor")
group.save() # save this new group for this example
user = User.objects.get(pk = 1) # assuming, there is one initial user
user.groups.add(group) # user is now in the "Editor" group
then...