range of processors. For the moment of this writing following bits are
significant:
-=over
+=over 4
=item bit #4 denoting presence of Time-Stamp Counter.
The capability vector is further extended with EBX value returned by
CPUID with EAX=7 and ECX=0 as input. Following bits are significant:
-=over
+=over 4
=item bit #64+3 denoting availability of BMI1 instructions, e.g. ANDN;
=item bit #64+31 denoting availability of AVX512VL extension;
+=item bit #64+41 denoting availability of VAES extension;
+
+=item bit #64+42 denoting availability of VPCLMULQDQ extension;
+
=back
To control this extended capability word use ':' as delimiter when
It should be noted that whether or not some of the most "fancy"
extension code paths are actually assembled depends on current assembler
version. Base minimum of AES-NI/PCLMULQDQ, SSSE3 and SHA extension code
-paths are always assembled. Besides that, minimum assembler version
+paths are always assembled. Apart from that, minimum assembler version
requirements are summarized in below table:
Extension | GNU as | nasm | llvm
ADCX/ADOX | 2.23 | 2.10 | 3.3
AVX512 | 2.25 | 2.11.8 | see NOTES
AVX512IFMA | 2.26 | 2.11.8 | see NOTES
+ VAES | 2.30 | 2.13.3 |
=head1 NOTES
instead of real clang. In which case it doesn't matter which clang
version is used, as it is GNU assembler version that will be checked.
+=head1 RETURN VALUES
+
+Not available.
+
=head1 COPYRIGHT
-Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
-Licensed under the OpenSSL license (the "License"). You may not use
+Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.