On 3/25/21 7:47 PM, Robert Hoo wrote:
On Thu, 2021-03-25 at 06:39 -0600, Richard Henderson wrote:
On 3/24/21 9:15 PM, Robert Hoo wrote:
+ } else if (env->xcr0 & XFEATURE_AVX) {
This is normally a 2-bit test.
I beg your pardon. What 2 bits?
I forget the names, but isn't the usual test xcr0 & 6 == 6?
6 stands for SSE state-component and AVX state-component.
I'm not sure about this.
Can you remember where did you this "xcr0 & 6 == 6"? I can look into
that.
IA-64 and IA32 Software developers manual, Vol 1 Basic Architecture, Section
14.3 Detection of AVX instructions.
r~
