Messages in this thread | | | Date | Thu, 14 May 2009 07:16:10 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86_64 |
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Andi Kleen wrote: >>> >> The right way to do it is to pass the proper type of register. > > For the input index register you don't actually need 64bit and for the > value it's typically memory anyways. >
If you have a 64-bit operation you have a 64-bit index register. And you need a 64-bit index for it to handle over 2^31 (since it is signed.)
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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