Warning 2461: Why Immediate value (*) should not exceed 7 raised for shufps?

[AndreyDmitriev]

Hi!
Strange warning appear in attempt to use shufps:


|000000E4:66490F6ED8 | movq xmm3, r8
|000000E9:66480F6EE0 | movq xmm4, rax
|000000EE:0FC6DC11 | shufps xmm3,xmm4,00010001b
|## W2461 Immediate value (17) should not exceed 7.
|000000F2: |


In my humble understanding such mask is valid for shufps and this should not exceed 255, but not 7, or did I missing something?

Andrey.

[vitsoft]

No, you didn't miss anything; according to the description in SHUFPS, shuffle instructions use imm8[1:0], imm8[3:2], imm8[5:4], imm8[7:6] and the value of immediate operand 0..255 is legal. I must have misunderstand the selection mechanism of the third operand years ago

This bug will be fixed in the next version of EuroAssembler. Until then you can ignore the warning or suppress it with EuroAsm NoWarn=2461.
In the source file iip.htm the line 4727 IiEmitImm Operand3, BYTE, Max=7 will change to IiEmitImm Operand3, BYTE, Max=255.

Thank you for noticing.