On Fri, 27 Jul 2012, Luigi Rizzo wrote:
On Thu, Jul 26, 2012 at 11:39:59PM +0200, Roman Divacky wrote:
Why dont you use __builtin_prefetch() ?
ignorance :)
thanks for the pointer, i'll look at it.
i suppose it works for clang too ?
Even gcc-3.3.1 has it (I expected it not to). And it works quite
well (defaults to nothing from -mi386, and gives prefetcht0 for
-march=athlon-xp and later). Other builtins that I have tried
didn't work so well (IIRC, many generate a call to a library
function instead of nothing, when the CPU or compiler doesn't
really support them).
Bruce
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