On Tue, 2020-04-07 at 00:33 +0200, Jakub Jelinek wrote: > Hi! > > getopt.c hangs the compiler on h8300-elf with -O2 -g, because the > IL contains addition of constant 0, the first PLUS operand is determined > to have the SP_DERIVED_VALUE_P and the new code in cselib recurses > indefinitely on seeing SP_DERIVED_VALUE_P with locs of > (plus:P SP_DERIVED_VALUE_P (const_int 0)). > > Fixed by making sure cselib_subst_to_values canonicalizes it, hashing > already hashes it the same too. > > Bootstrapped/regtested on x86_64-linux and i686-linux, tested on the > getopt.i testcase using cross to h8300-elf, approved off-list by Jeff, > committed to trunk. > > 2020-04-06 Jakub Jelinek <ja...@redhat.com> > > * cselib.c (cselib_subst_to_values): For SP_DERIVED_VALUE_P > + const0_rtx return the SP_DERIVED_VALUE_P. Thanks. And just FTR, the scenario where this happens could (in theory) happen on other ports, particularly those still using reload.
jeff >
