Bug 1871151 Comment 4 Edit History

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Original comment by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions, but that's *not* the same as Alder Lake and later AVXVNNI, which have a different prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct.
Revision 1 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit and 256-bit width), but that's *not* the same as Alder Lake and later AVXVNNI, which have a different prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct.
Revision 2 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit and 256-bit width), but that's *not* the same as Alder Lake and later AVXVNNI, which have a different `VEX` prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct.
Revision 3 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit and 256-bit width), but that's *not* the same as Alder Lake and later AVXVNNI, which have a different `VEX` prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct, specifically, not VEX for Tiger Lake.
Revision 4 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit and 256-bit width), but that's *not* the same as Alder Lake and later AVXVNNI, which have a different `VEX` prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct, specifically, *not* `VEX` for Tiger Lake.
Revision 5 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit and 256-bit width), but that's *not* the same as AVXVNNI on later CPUs like Alder Lake, which have a different `VEX` prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct, specifically, *not* `VEX` for Tiger Lake.
Revision 6 by
on 
Serge, Tiger Lake supports AVX512 VNNI instructions (in 512-bit *and* 256-bit width), but that's *not* the same as AVXVNNI on later CPUs like Alder Lake, which have a different `VEX` prefix. When you see `vpdpbusd`, check whether the instruction prefix is correct, specifically, *not* `VEX` for Tiger Lake.

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