Hi,
Andrew Haley wrote:
Jari Kuusisto wrote:
An this solution seems to be working, and performance values were now
improved. Could you please explain to me what this "memory" section in
asm line actually does?
Rather than asking Ian himself to explain it to you, please look in the docs.
It's called a memory clobber.
See 5.37 Assembler Instructions with C Expression Operands
Andrew.
I've read that documentation couple of times before but did not notice
that memory clobber there before. Now that I know the feature I should
use, I of course found the definition from the documentation.
But I still ain't exactly sure what the memory clobber actually does,
but I assume that it prevents reordering code blocks before and after
the specific asm command because it declares access to memory in an
unpredictable fashion and GCC cannot move code blocks because of that.
Thanks for your help!
BR. Jari K.
