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C can pointers be aligned with any other data type?


C can pointers be aligned with any other data type?

By : user2956144
Date : November 22 2020, 10:54 AM
will be helpful for those in need The C standard doesn't explicitly guarantee that object pointers have the most stringent alignment requirements. On some systems, long double may have a more stringent alignment requirement; on other systems, function pointers may have a more stringent alignment requirement.
However, with a little care and attention, you can determine the alignment requirements. You need to decide how portable and automatic you need the answer to be. It is easy to find an answer by compiling code and finding the answer. It is considerably harder to create a foolproof automatic way of doing it automatically for any type, not least because the arbitrary element type may be larger or smaller than an object pointer.
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Mis-aligned pointers on x86

Mis-aligned pointers on x86


By : Bikethetam
Date : March 29 2020, 07:55 AM
wish helps you There is an additional condition, not mentioned, for EFLAGS.AC to actually take effect. CR0.AM must be set to prevent INT 17h from tripping on older OSes predating the 486 that have no handler for this exception. Unfortunately, Windows do not set it by default, you need to write a kernel-mode driver to set it.
Should I always pass aligned datatypes as pointers?

Should I always pass aligned datatypes as pointers?


By : CodeTheWorld
Date : March 29 2020, 07:55 AM
this will help The problem was caused by specifying %g instead of %lg for the double arguments to printf. With %g, some values were not printed correctly. (The compiler does not seem to have printf-syntax checker.)
Do 4byte aligned pointers use any padding?

Do 4byte aligned pointers use any padding?


By : Saurat Xiuhcoatl
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You may notice the key word "usually" in that statement. "Usually" does not imply "always". And if something isn't always true, you can't assume it to be true and just chop off the last two bits.
Most pointers to live objects will have alignments of at least 4 bytes. However, you can create an array of chars, and those elements will be byte addressable. That something happens 99% of the time doesn't mean you can ignore the final 1% where it doesn't happen.
Fast axis-aligned cuboid data type

Fast axis-aligned cuboid data type


By : Hans Skov-Petersen
Date : March 29 2020, 07:55 AM
This might help you So far the best match for what I seek seems to be Microsoft.Xna.Framework.BoundingBox, the study of which has proven to be both enlightening and confusing.
it is a struct:
code :
 public struct BoundingBox : IEquatable<BoundingBox> 
 {
       public Vector3 Min; public Vector3 Max;
       ...
 }
  public struct Vector3 : IEquatable<Vector3> 
  {
       public float X,Y,Z;
       ...
  }
Reinterpreting suitably aligned pointers to object with declared type

Reinterpreting suitably aligned pointers to object with declared type


By : Dean
Date : March 29 2020, 07:55 AM
wish helps you The Standard allows us to cast pointers to object type to each other if they are suitably aligned. 6.3.2.3(p7): , memcpy()'s look OK.
c64_ptr -> value is UB.
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