On Sun, Jan 29, 2012 at 2:09 PM, Jeremiah Willcock <jewillco@osl.iu.edu>wrote:
On Sun, 29 Jan 2012, John Salmon wrote:
(snip)
By the way, the code in aes_hasaesni.hpp that trashes %ebx, and is
therefore problematic with -m32 -fPIC is conditionalized on #ifdef BOOST_HAS_AESNI. While I agree that the #ifdef logic to set BOOST_HAS_AESNI needs work, I think it's safe to say that BOOST_HAS_AESNI should never be set when -m32 is in effect.
Is there a reason for that? AESNI instructions use SSE registers, so they are independent of 32-bit vs. 64-bit mode.
You're correct. I mistakenly assumed that you couldn't use AESNI instructions in 32-bit code. I'm not sure why anyone would want to, but it *is* possible. I'll add the code to push and pop %ebx around cpuid.
John -- Jeremiah Willcock
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