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What is this called? asm( %0 :: "r"(0) )

sam d over 12 years ago

Note: This was originally posted on 3rd January 2011 at http://forums.arm.com

Hi all - I am using this asm instruction:


"mrc p15, 0, %0, c0, c0, 0" :: "r" (0)�

to automatically chose an unused register that I can use...I want to find more information on this technique so what can I look up?? Also - what does the double colon do "::" ??

thank you

Simon Craske over 12 years ago
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Simon Craske over 12 years ago

Note: This was originally posted on 3rd January 2011 at http://forums.arm.com

http://www.ethernut.de/en/documents/arm-inline-asm.html

appears worth reading.

hth
s.
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What is this called? asm( %0 :: &#34;r&#34;(0) )

What is this called? asm( %0 :: "r"(0) )