https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87762
--- Comment #4 from iii at gcc dot gnu.org --- Author: iii Date: Fri Nov 9 20:33:19 2018 New Revision: 265991 URL: https://gcc.gnu.org/viewcvs?rev=265991&root=gcc&view=rev Log: S/390: Allow relative addressing of literal pool entries r265490 allowed the compiler to choose in a more flexible way whether to use load or load-address-relative-long (LARL) instruction. When it chose LARL for literal pool references, the latter ones were rewritten by pass_s390_early_mach to use UNSPEC_LTREF, which assumes base register usage, which in turn is not compatible with LARL. The end result was an ICE because of unrecognizable insn. UNSPEC_LTREF and friends are necessary in order to communicate the dependency on the base register to pass_sched2. When relative addressing is used, no base register is necessary, so in such cases the rewrite must be avoided. gcc/ChangeLog: 2018-11-09 Ilya Leoshkevich <i...@linux.ibm.com> PR target/87762 * config/s390/s390.c (s390_safe_relative_long_p): New function. (annotate_constant_pool_refs): Skip insns which support relative addressing. (annotate_constant_pool_refs_1): New helper function. (find_constant_pool_ref): Skip insns which support relative addression. (find_constant_pool_ref_1): New helper function. (replace_constant_pool_ref): Skip insns which support relative addressing. (replace_constant_pool_ref_1): New helper function. (s390_mainpool_start): Adapt to the new signature. (s390_mainpool_finish): Likewise. (s390_chunkify_start): Likewise. (s390_chunkify_finish): Likewise. (pass_s390_early_mach::execute): Likewise. (s390_prologue_plus_offset): Likewise. (s390_emit_prologue): Likewise. (s390_emit_epilogue): Likewise. Modified: trunk/gcc/ChangeLog trunk/gcc/config/s390/s390.c
