ARM Overview: Difference between revisions
added two more links about division issues as it actually can be quite complex depending on what CPUs are targeted and the features they have enabled
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(added two more links about division issues as it actually can be quite complex depending on what CPUs are targeted and the features they have enabled) |
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==Coding Gotchas==
===== Missing Division Functions (__aeabi_uidivmod, __aeabi_idiv) / No Division Support =====
This issue is actually complicated because different CPUs may not support hardware division, support it only through the floating point operations, in thumb mode, in native mode, or a combination. Also, in certain situations you may find it faster or more compact to use different methods because you may be interested in code size or performance.
See, [http://forum.osdev.org/viewtopic.php?f=1&t=23857&p=212244 this forum post].▼
The following links talk about different methods in handling this problem:
http://stackoverflow.com/questions/8348030/how-does-one-do-integer-signed-or-unsigned-division-on-arm
Also, some extra information that maybe useful:
http://www.linkedin.com/groups/ARM-cores-hardware-division-85447.S.242517259
===== Unaligned Memory Access And Byte Order =====
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