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perlasm/x86_64-xlate.pl: add commentary.

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Reviewed-by: Rich Salz <rsalz@openssl.org>
This commit is contained in:
Andy Polyakov 2016-06-08 15:55:35 +02:00
parent 6a4ea0022c
commit 1eb12c437b
1 changed files with 7 additions and 1 deletions
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8
crypto/perlasm/x86_64-xlate.pl
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@ -692,7 +692,13 @@ sub rex {
push @$opcode,($rex|0x40) if ($rex);
}
# older gas and ml64 don't handle SSE>2 instructions
# Upon initial x86_64 introduction SSE>2 extensions were not introduced
# yet. In order not to be bothered by tracing exact assembler versions,
# but at the same time to provide a bare security minimum of AES-NI, we
# hard-code some instructions. Extensions past AES-NI on the other hand
# are traced by examining assembler version in individual perlasm
# modules...
my %regrm = ( "%eax"=>0, "%ecx"=>1, "%edx"=>2, "%ebx"=>3,
"%esp"=>4, "%ebp"=>5, "%esi"=>6, "%edi"=>7 );