[Sesse__]

> FMUL could only be issued every other cycle, which made scheduling even more annoying.

Huh, are you sure? Do you have any documentation that clarifies the rules for this? I was under the impression that something like `FMUL st, st(2) ; FXCH st(1), FMUL st, st(2)` would kick off two muls in two cycles, with no stall.

[Tuna-Fish]

Agner Fog's manuals are clear on this. Only the last of FMUL's 3 cycles can overlap with another FMUL.

You can immediately overlap with a FADD.