CODEWITHSUNDEEP
assemblyarm64
Steven
Steven

Reputation: 871

What did dot (between two key words) mean in ARM assembly?

I saw a assembly like:

b.gt memzero

I think I know the meaning of b.gt but not sure why the syntax is legal. By developer guide, I've not seen any syntax like this.

Are there any document regulate this kind of syntax? Or how can I call it?

Upvotes: 1

Views: 473

Answers (1)

Siguza
Siguza

Reputation: 23820

As commenters have mentioned, you have the wrong guide. You need the 64-bit guide if you're looking at 64-bit code.

In A64, the instruction is formally called b.cond, where cond can be any condition code.
The dot has no special meaning, just like in ret, the e has no special meaning. It's just a sequence of characters defined by ARM.

Also note that this "Reference Guide" on their website is quite malicious - for example, clicking the "Condition Codes" link on the b.cond page will take you out of the A64 guide and into the A32/T32 guide. I therefore recommend you download the PDF instead and stick with it.

Upvotes: 5

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