Intel 9.1 (Linux) compiler question

[john_anctil]

Is there any documentation which describes, in more detail, the differences between -xP and -xT options?

[Steven_L_Intel1]

I thought the current documentation was clear. The difference is that -xT enables generation of the "Supplemental Streaming SIMD 3" (SSSE3) instructions, as supported by the Intel Core 2 processor family, whereas -xP goes up to SSE3 only (newer Pentium 4 and Intel Core processors). Programs compiled with -xT will not run on processors other than the Intel Core 2 family (and whatever future processors are compatible.)

[TimP]

There are some differences in scheduling between -xP and -xT, so small performance changes may occur. In principle, -xT could optimize better for Core 2, but I haven't seen that happen in practice.