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James Gregory 2013-12-31 11:06:31 +11:00
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@ -53,9 +53,9 @@ instruction if necessary, and the time required to execute a **NOP** can
sometimes cancel the performance advantage of having a word-aligned
branch destination.
------------------- -----------------------------------------------------------------------------------------------------------------
![](images/i.jpg) *Consequently, it's best to word-align only those branch destinations that can be reached solely by branching.*
------------------- -----------------------------------------------------------------------------------------------------------------
> ![](images/i.jpg)
> Consequently, it's best to word-align only those branch destinations
> that can be reached solely by branching.
I recommend that you only go out of your way to word-align the start
offsets of your subroutines, as in:
@ -112,9 +112,8 @@ interrupt occurring between the two instructions will be serviced more
slowly than it normally would. The same goes for decrementing twice; use
**SUB SP,2** instead.
------------------- ------------------------------------------------
![](images/i.jpg) *Keep the stack pointer aligned at all times.*
------------------- ------------------------------------------------
> ![](images/i.jpg)
> Keep the stack pointer aligned at all times.
#### The DRAM Refresh Cycle-Eater: Still an Act of God {#Heading11 align="center"}