[Bug rtl-optimization/56069] [5/6/7 Regression] RA pessimization

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56069

--- Comment #16 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
I retested again with a few different combinations of things. With an older
gdb, I can still reproduce the issue that sra-1 becomes UNSUPPORTED (presumably
through a gdb crash). With gdb-7.12 installed the patch now causes sra-1.c to
fail (apparently a value becomes optimized out). If we consider the guality
testsuite in some way meaningful we still can't apply this patch.
Also, Vlad's reasoning for waiting until gcc-7 last time now holds for waiting
until gcc-8.