[Bug middle-end/71318] New: Can't disable ISAs via function attribute

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71318

            Bug ID: 71318
           Summary: Can't disable ISAs via function attribute
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

GCC calls init_optabs to initialize the optabs for the current target
machine before compilation.  It will use them even when they are disabled
by function attribute.