[email protected] (Niels Möller) writes:
> I think current gcc may recognize (x << n) | (x >> (wordsize - n)) and
> generate a rotate instruction (but I haven't tested).
Now I have tested. gcc 4.4.5 seems to recognize it, even without
optimization.
Test program:
#include <stdint.h>
uint32_t rot32(uint32_t x, int k)
{
return (x << k) | (x >> (32-k));
}
uint32_t rot64(uint64_t x, int k)
{
return (x << k) | (x >> (64-k));
}
Compile with gcc -S -O0, and examine the generated assembler.
Regards,
/Niels
--
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