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This commit implements the target macros for shrink wrapping of function prologues/epilogues shrink wrapping on LoongArch. Bootstrapped and regtested on loongarch64-linux-gnu. I don't have an access to SPEC CPU so I hope the reviewer can perform a benchmark to see if there is real benefit. gcc/ChangeLog: * config/loongarch/loongarch.h (struct machine_function): Add reg_is_wrapped_separately array for register wrapping information. * config/loongarch/loongarch.cc (loongarch_get_separate_components): New function. (loongarch_components_for_bb): Likewise. (loongarch_disqualify_components): Likewise. (loongarch_process_components): Likewise. (loongarch_emit_prologue_components): Likewise. (loongarch_emit_epilogue_components): Likewise. (loongarch_set_handled_components): Likewise. (TARGET_SHRINK_WRAP_GET_SEPARATE_COMPONENTS): Define. (TARGET_SHRINK_WRAP_COMPONENTS_FOR_BB): Likewise. (TARGET_SHRINK_WRAP_DISQUALIFY_COMPONENTS): Likewise. (TARGET_SHRINK_WRAP_EMIT_PROLOGUE_COMPONENTS): Likewise. (TARGET_SHRINK_WRAP_EMIT_EPILOGUE_COMPONENTS): Likewise. (TARGET_SHRINK_WRAP_SET_HANDLED_COMPONENTS): Likewise. (loongarch_for_each_saved_reg): Skip registers that are wrapped separately. gcc/testsuite/ChangeLog: * gcc.target/loongarch/shrink-wrap.c: New test.
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