[Bug middle-end/105032] Compiling inline ASM x86 causing GCC stuck in an endless loop with 100% CPU usage

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105032

--- Comment #10 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
I've reproduced the bug also on the trunk.  The loop in question assumes a
specific order for reload insns.  In this case order of insns involving the
reload pseudos is violated because the pseudo is also used for inheritance.

We can change the loop condition to guarantee its finish independently of the
reload insns order.  It might results in failure of hard reg live range
splitting for the pseudo. Permitting hard reg splitting for reload pseudo
involved in inheritance is questionable with LRA correct work and generated
code efficiency.  So it has no sense for me to do this.

The patch will be pushed to trunk right after finishing testing.