https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100799
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2021-06-01
--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Alexander Grund from comment #1)
> Confirmed to also break with GCC 7.3, 8.2, 8.3 but works with 6.3, 6.4, 6.5
The failure with GCC 7 and later coincides with the PPC port starting to
default to LRA instead of reload. If I look at the debug dumps compiling
dgebal.f, the 440 offset to the stack is created by an LRA spill. No problem
there that I can see. The problem seems to come later when we generate the
prologue/epilogue and we only update the stack pointer by the smaller 368 byte
offset.
Either LRA isn't telling us it needs that extra stack space or the ppc backend
didn't notice. I'll keep digging.
