ARM Cortex R4F Manuale Utente Scaricare il pdf (Pagina 16)

ARM CPU (More) Features

All instructions are conditionally executed:

• A very useful feature

• Loads, stores, procedure calls and returns, and all other operations

can execute conditionally after some prior instruction to set the

condition code flags

• Any ALU instruction may set the flags

• This eliminates short forward branches in ARM code

• It also improves code density and avoids flushing the pipeline for

branches and increase execution performance

 Most of the architectures have conditional branch instructions

 These follow a test or compare instruction to control the flow of

execution through the program

 Some architectures also have a conditional move instruction,

allowing data to be conditionally transferred between registers

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ARM Cortex R4F Manuale Utente Pagina 16