This is the mail archive of the
binutils@sourceware.org
mailing list for the binutils project.
Re: PATCH: Move operand/address-size override prefixes before SIMD prefix
On Thu, Dec 07, 2006 at 01:26:59PM -0600, Menezes, Evandro wrote:
> > Thank you, but it does not. Because presence of both 0xf2 and 0xf3 in
> > the byte stream is not covered by this paragraph (perhaps the
> > situation is explained elsewhere in the manual?)
>
> Yes, elsewhere: "The result of using multiple prefixes from a single group is unpredictable." (in "AMD64 Architecture Programmer's Manual Volume 3: General-Purpose and System Instructions", rev. 3.12, p. 3)
>
Intel IA32 SDM Vol 2A says that such combinations are reserved and may
cause unpredictable behavior.
H.J.