[Bug rtl-optimization/83321] [7/8 Regression] Conditional jump or move depends on uninitialised value in ira.c/ira-color.c

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83321

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-12-09
            Summary|Conditional jump or move    |[7/8 Regression]
                   |depends on uninitialised    |Conditional jump or move
                   |value in ira.c/ira-color.c  |depends on uninitialised
                   |                            |value in ira.c/ira-color.c
     Ever confirmed|0                           |1

--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Only happens with gcc-7 or gcc-8. Even -O2 optimizes the VALGRIND_DISCARDs
away.

Building stage1 with gcc-6 shows no issues.