6x86 vs 6x86L

In order to differentiate the 6x86L from the 6x86 "classic", look at the CPU feature flags. The 6x86L supports the "compare and exchange 8-byte" feature, while the classic 6x86 does not.

Notes: Cyrix developed two distinct versions of the 6x86 CPU (not counting the 6x86MX or the mII, that is): the 6x86 "classic" and the 6x86L. The differences between them are very subtle, i.e. the 6x86L fixes some bugs from the 6x86 and introduces some new ones, especially in the 6x86's unique "Variable Page Size MMU" feature - this feature was dropped in the 6x86MX and later because it was unsupported, *very* buggy, no significant performance gain (although to be fair to Cyrix, this is because the 6x86 family has very high performance memory management in the first place). The final nail in the coffin was that, for some reason, most of the Cyrix documentation on VPSM was inaccurate!