https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87944
Stefan "Bebbo" Franke <stefan at franke dot ms> changed:
What |Removed |Added
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CC| |stefan at franke dot ms
--- Comment #4 from Stefan "Bebbo" Franke <stefan at franke dot ms> ---
the problem resides in lra-eliminations.c.
It starts in void eliminate_regs_in_insn where a simple plus bypasses the stack
offset handling:
/* If we have a nonzero offset, and the source is already a
simple REG, the following transformation would increase
the cost of the insn by replacing a simple REG with (plus
(reg sp) CST). So try only when we already had a PLUS
before. */
if (known_eq (offset, 0) || plus_src)
because lra_get_insn_recog_data (insn)->sp_offset is not considered.
With the m68k architecture plus using lra you get this problem plus some
similar ones, all related to arg / frame / stack pointer conversion with
incorrect offsets.
I fixed it locally with few more changes in lra-elimintaions.c
