[Bug bootstrap/77510] New: genautomata memory footprint for MIPS

[lly.dev at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77510

            Bug ID: 77510
           Summary: genautomata memory footprint for MIPS
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lly.dev at gmail dot com
  Target Milestone: ---

Created attachment 39578
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39578&action=edit
genautomata output MIPS32

Hello,

bootstrapping/crosscompiling gcc 5.4.0 for MIPS, genautomata uses a lot of
memory. This causes swapping/thrashing and extremely long build times on low
memory systems. According to valgrind massif report, it requires 527MB of heap
now.

genautomata output(-time -progress -stats) attached to PR. Probably we need to
try to decrease reservations for `xlp_cpu', `xlp_fpu' since simple
disable(comment out it in mips.md) of xlp support decreases heap usage down to
43MB.

Similar to bug 70473, which requests that a new bug is filed.
Thank you for your attention!