crypto/x86_64cpuid.pl: detect if kernel preserves %zmm registers.

	jnc	.Lclear_avx

	xor	%ecx,%ecx		# XCR0

	.byte	0x0f,0x01,0xd0		# xgetbv

	and	\$0xe6,%eax		# isolate XMM, YMM and ZMM state support

	cmp	\$0xe6,%eax

	je	.Ldone

	andl	\$0xfffeffff,8(%rdi)	# clear AVX512F, ~(1<<16)

					# note that we don't touch other AVX512

					# extensions, because they can be used

					# with YMM (without opmasking though)

	and	\$6,%eax		# isolate XMM and YMM state support

	cmp	\$6,%eax

	je	.Ldone

.Lclear_avx:

	mov	\$0xefffe7ff,%eax	# ~(1<<28|1<<12|1<<11)

	and	%eax,%r9d		# clear AVX, FMA and AMD XOP bits

	andl	\$0xffffffdf,8(%rdi)	# cleax AVX2, ~(1<<5)

	mov	\$0x3fdeffdf,%eax	# ~(1<<31|1<<30|1<<21|1<<16|1<<5)

	and	%eax,8(%rdi)		# cleax AVX2 and AVX512* bits

.Ldone:

	shl	\$32,%r9

	mov	%r10d,%eax