I accept the argument that the suffixes mean something a little different in these SSE2 instructions than in the "classical" x86 instructions. But I think it sh

I accept the argument that the suffixes mean something a little different in these SSE2 instructions than in the "classical" x86 instructions. But I think it should be clear where these suffixes come from (thus there is some convergence of the Intel syntax for new instruction towards the AT&T syntax). And indeed the instructions paddb, paddw, paddd, paddq are the same on Intel and AT&T syntax. Look at > https://docs.oracle.com/cd/E19253-01/817-5477/817-5477.pdf https://docs.oracle.com/cd/E19253-01/817-5477/817-5477.pdf First convince yourself (for example by looking at page 26-39) that in the individual tables the column "Solaris Mnemonic" stands for the AT&T syntax and the column "Intel/AMD Mnemonic" stands for the Intel syntax. Now look at page 48. Surprise: It is paddb, paddw, paddd, paddq both in Intel and AT&T syntax.