9ebc9fbddd
In s390_expand_insv(), if generating code for ICM et al. src is a MEM and gen_lowpart might force src into a register such that we end up with patterns which do not match anymore. Use adjust_address() instead in order to preserve a MEM. Furthermore, it is not straight forward to enforce a subreg. For example, in case of a paradoxical subreg, gen_lowpart() may return a register. In order to compensate this, s390_gen_lowpart_subreg() emits a reference to a pseudo which does not coincide with its definition which is wrong. Additionally, if dest is a paradoxical subreg, then do not try to emit a strict_low_part since it could mean that dest was not initialized even though this might be fixed up later by init-regs. Splitter for insn *get_tp_64, *zero_extendhisi2_31, *zero_extendqisi2_31, *zero_extendqihi2_31 are applied after reload. Thus, operands[0] is a hard register and gen_lowpart (m, operands[0]) just returns the hard register for mode m which is fine to use as an argument for strict_low_part, i.e., we do not need to enforce subregs here since after reload subregs are supposed to be eliminated anyway. This fixes gcc.dg/torture/pr111821.c. gcc/ChangeLog: * config/s390/s390-protos.h (s390_gen_lowpart_subreg): Remove. * config/s390/s390.cc (s390_gen_lowpart_subreg): Remove. (s390_expand_insv): Use adjust_address() and emit a strict_low_part only in case of a natural subreg. * config/s390/s390.md: Use gen_lowpart() instead of s390_gen_lowpart_subreg(). |
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