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Recent patch for PR121191 broke compilation of s390 SPEC benchmarks. This patch fixes it. The patch uses existing lra_constraint_offset to calculate offsets. The same function is used to find invalid matching reloads. gcc/ChangeLog: PR rtl-optimization/124079 * lra-constraints.cc (get_matching_reload_reg_subreg): Add new arg rclass. Use another condition to use lowpart_subreg. Use lra_constraint_offset to calculate the subreg offset. (get_reload_reg, match_reload): Pass the new arg. gcc/testsuite/ChangeLog: PR rtl-optimization/124079 * gcc.target/s390/pr124079.c: New.
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