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ARM mode Thumb mode switching

Note: This was originally posted on 13th January 2011 at http://forums.arm.com

Hi,

Let me explain my problem,
i come across one situation

cmp r1,#0
beq labels_of1

i would like to merge both the instructions in to one. for that i would like to use cbz (thumb instruction)

but my compiler shows an error message that this particular instruction not present in the Instruction.

Since the instruction is cbz the compilation should be in thum mode. how can i modify my make file and how can i switch the mode from ARM to thumb for execute the optimized instruction.

please let me know the mode change needs any extra cycle.

Rgds
Dave

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Simon Craske over 12 years ago
Note: This was originally posted on 19th January 2011 at http://forums.arm.com

Without knowing

What what the likelyhood of each branch being taken is
What values "// modify the val[u]es of a0,b0,c0[color="#000000"]" actually uses are, and[/color]
[color="#000000"]What the target CPU is[/color]
it's hard to say.

s.
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Simon Craske over 12 years ago
Note: This was originally posted on 19th January 2011 at http://forums.arm.com

Without knowing

What what the likelyhood of each branch being taken is
What values "// modify the val[u]es of a0,b0,c0[color="#000000"]" actually uses are, and[/color]
[color="#000000"]What the target CPU is[/color]
it's hard to say.

s.
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Vote up 0 Vote down

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