[Bug debug/106746] [13 Regression] '-fcompare-debug' failure (length) with -O2 -fsched2-use-superblocks since r13-2041-g6624ad73064de241

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106746

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #13)
> DEBUG_INSNs should never influence any scheduling decisions, or any other
> decisions that influence what machine code we generate.

Well, with the exception of scheduling decisions for the DEBUG_INSNs themselves
(where exactly to place them).
haifa-sched.cc is full of various DEBUG_INSN related checks, in some cases
DEBUG_INSNs are ignored, in other places they are taken into account, ...
And in the end, most of the time it works fine for -fcompare-debug checks; it
doesn't for this testcase, so that needs to be understood why and fixed.