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As aarch64_function_arg_regno_p is a very hot function called many times for a function it should not call fndecl_abi every time as it is expensive and unecessasary. This caches the result and in doing so fixes a regression in compile time introduced by r16-5076-g7197d8062fddc2. gcc/ChangeLog: * config/aarch64/aarch64.cc (aarch64_fndecl_abi): New function. (aarch64_function_abi): New function. (aarch64_function_arg_regno_p): Update to use aarch64_fndecl_abi. (aarch64_output_mi_thunk): Likewise. (aarch64_is_variant_pcs): Likewise. (aarch64_set_current_function): Update to initialize pcs value. * config/aarch64/aarch64.h (enum arm_pcs): Move location earlier in file. (machine_function) Add pcs value.
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