https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87596
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |krebbel at gcc dot gnu.org
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
My bisect found that Andreas is the unlucky winner of this bug:
r263063 | krebbel | 2018-07-30 03:30:06 -0500 (Mon, 30 Jul 2018) | 18 lines
lra: consider clobbers when selecting hard_regno to spill
The idea behind the rclass loop in spill_hard_reg_in_range() seems to
be: find a hard_regno, which in general conflicts with reload regno,
but does not do so between `from` and `to`, and then do the live range
splitting based on this information. To check the absence of conflicts,
we make use of insn_bitmap, which does not contain insns which clobber
the hard_regno.
gcc/ChangeLog:
2018-07-30 Ilya Leoshkevich <i...@linux.ibm.com>
PR target/86547
* lra-constraints.c (spill_hard_reg_in_range): When selecting the
hard_regno, make sure no insn between `from` and `to` clobbers it.
