extended asm - memory constraint

[mc2718]

Many thanks for clearing it up.

By the way, can one pass (long long)-s but NOT through memory? (Ignore for
the moment SSE completely.) For most 64-bit math, gcc keeps these in two
32-bit registers - I wonder whether I can get gcc to use those registers in
some of my own assembly code without any excursions to memory and back.
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