pshufb

[bob]

For some reason, the pshufb instruction does not work on my
AMD Athlon 64. I tried it in 32 bit mode, and I get an illegal
instruction message from Windows.

According to this:


http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485...


it should support SSE3.


Any ideas why pshufb doesn't work?

 

[dave]

For some reason, the pshufb instruction does not work on my
AMD Athlon 64. I tried it in 32 bit mode, and I get an illegal
instruction message from Windows.

According to this:


http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485...


it should support SSE3.


Any ideas why pshufb doesn't work?

Can you post the binary or hex encoding of the pshufb instruction that is
causing the illegal instruction exception?

 

[bob]

Can you post the binary or hex encoding of the pshufb instruction that is
causing the illegal instruction exception?

It is the following five bytes:

0x66
0x0F
0x38
0x00
0xC1

 

[dave]

It is the following five bytes:

0x66
0x0F
0x38
0x00
0xC1

All the google searches I've done on pshufb indicate that this instruction is SSE4.

 

[dave]

It is the following five bytes:

0x66
0x0F
0x38
0x00
0xC1

Sandpile.org says pshufb is *Supplemental* SSE3 (SSSE3) which is a follow-on to
SSE3.

 

[bob]

Sandpile.org says pshufb is *Supplemental* SSE3 (SSSE3) which is a follow-on to
SSE3.

Okay. It looks like it is SSSE3.