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by tjgq
4150 days ago
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It declares a variable named r10 and instructs the compiler to store it in the r10 CPU register. It's a GCC extension; the farthest you can get in standards-compliant C is register long r10 = a3;
but the register keyword is advisory only (the compiler is free to ignore it) and you cannot specify the exact register you want to be used.Reference: https://gcc.gnu.org/onlinedocs/gcc/Local-Reg-Vars.html |
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