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These two spots are meant to punt if the newly added code contains any CALL_INSNs, because in that case having a large sequence of insns that also calls something is undesirable, better have one call that is optimized in itself well. The functions do last = get_last_insn (); before emitting any insns (and expand_binop as the ultimate caller uses delete_insns_since if the expansion fails), but the checks were incorrect for 2 reasons: 1) it checked not just what follows after that last insn, but also the last insn itself; so, if the division or modulo is immediately preceded by a CALL_INSN, then we punt; this also causes -fcompare-debug failures if the CALL_INSN is with -g followed by one or more DEBUG_INSNs 2) if get_last_insn () is NULL (i.e. emitting into a new sequence), then we didn't check anything 2021-12-28 Jakub Jelinek <jakub@redhat.com> PR debug/103838 * optabs.c (expand_doubleword_mod, expand_doubleword_divmod): Only check newly added insns for CALL_P, not the last insn of previous code. * gcc.dg/pr103838.c: New test. |
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