Add detection for Intel AVX2 instruction set
* configure.ac: Add option --disable-avx2-support. (HAVE_GCC_INLINE_ASM_AVX2): New. (ENABLE_AVX2_SUPPORT): New. * src/g10lib.h (HWF_INTEL_AVX2): New. * src/global.c (hwflist): Add HWF_INTEL_AVX2. * src/hwf-x86.c [__i386__] (get_cpuid): Initialize registers to zero before cpuid. [__x86_64__] (get_cpuid): Initialize registers to zero before cpuid. (detect_x86_gnuc): Store maximum cpuid level. (detect_x86_gnuc) [ENABLE_AVX2_SUPPORT]: Add detection for AVX2.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>