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Patch for PR124041 resulted in wrong code generation and in new PR124439 as the patch prevented equivalence substitution when equivalence initialization insn was removed. This patch implements another fix for PR124041 and this fixes PR124439. gcc/ChangeLog: PR rtl-optimization/124041 PR rtl-optimization/124439 * lra-constraints.cc (process_alt_operands): Check hard reg subreg mode by hard_regno_mode_ok. (curr_insn_transform): Always subsitute equivalence for hard reg subreg.
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