[Bug middle-end/52066] IRA and reginfo initialization too expensive

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52066

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-31 14:54:32 UTC ---
Created attachment 26535
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26535
i386 patch

Incremental patch to speed up i386 *CLASS_P macros.  I agree it isn't as clean
as defining them using the subsets (now used just in rtl checking during
initialization), but seems to be faster.  Timing with both patches:

~/timing --drop 20 -c 2500 ./cc1 empty.c -quiet
Strip out best and worst 500 realtime results
minimum: 0.006076317 sec real / 0.000018264 sec CPU
maximum: 0.034520375 sec real / 0.000205298 sec CPU
average: 0.006284155 sec real / 0.000036616 sec CPU
stdev  : 0.000048897 sec real / 0.000004400 sec CPU

  [12] .text             PROGBITS        00000000004b21a0 0b21a0 78e774 00  AX 
0   0 16

(i.e. it completely undoes all the code growth by the first patch).