open-quantum-safe / liboqs / 30058252981

81%

Build Type

push

github

Committed by web-flow

Commit Message

Fix usage of XGETBV inline assembly in CPU extension detection (#2503)

CPU runtime detection uses inline XGETBV assembly that declares only EAX
as an output, however XGETBV overwrites EDX:EAX. With -march=nocona
-mtune=nocona, GCC may retain the AES CPUID bit in EDX across XGETBV.
The overwritten high XCR0 word (normally zero) is then recorded as the
AES capability, disabling the AES CPU extension.

Signed-off-by: Joe Ciccone <jciccone@gmail.com>

Coverage Stats

1 of 1 new or added line in 1 file covered. (100.0%)

28 existing lines in 13 files now uncovered.

210586 of 255725 relevant lines covered (82.35%)

8073258.92 hits per line