Unifying i387 support

[Jim Blandy]

>    So, something like:
> 
>    #define REGISTER_NAMES { "eax",  "ecx",  "edx",  "ebx",  \
> 			    "esp",  "ebp",  "esi",  "edi",  \
> 			    "eip",  "eflags","cs",  "ss",   \
> 			    "ds",   "es",   "fs",   "gs",   \
> 			    "fctrl","fstat","ftag", "fioff",\
> 			    "fiseg","fop",  "fdoff","fdseg",\
> 			    "st",   "st1",  "st2",  "st3",  \
> 			    "st4",  "st5",  "st6",  "st7",}
> 
> Why "st" instead of "st0"?

That's what the Pentium manual calls it.  But I care not in the
slightest.