Andrew Stubbs <a...@baylibre.com> writes: > On 08/11/2024 12:25, Richard Sandiford wrote: >> For the aarch64 simd clones patches, it would be useful to be able to >> push a function declaration onto the cfun stack, even though it has no >> function body associated with it. That is, we want cfun to be null, >> current_function_decl to be the decl itself, and the target and >> optimisation flags to reflect the declaration. > > What do the simd_clone patches do? Just curious.
It's for https://gcc.gnu.org/pipermail/gcc-patches/2024-November/667499.html , which needs to switch to the simd clone's chosen target (SVE) in order to construct the correct types. Currently the patch uses: + cl_target_option_save (&cur_target, &global_options, &global_options_set); + tree new_target = DECL_FUNCTION_SPECIFIC_TARGET (node->decl); + cl_target_option_restore (&global_options, &global_options_set, + TREE_TARGET_OPTION (new_target)); + aarch64_override_options_internal (&global_options); + memcpy (m_old_have_regs_of_mode, have_regs_of_mode, + sizeof (have_regs_of_mode)); + for (int i = 0; i < NUM_MACHINE_MODES; ++i) + if (aarch64_sve_mode_p ((machine_mode) i)) + have_regs_of_mode[i] = true; to switch in and: + /* Restore current options. */ + cl_target_option_restore (&global_options, &global_options_set, &cur_target); + aarch64_override_options_internal (&global_options); + memcpy (have_regs_of_mode, m_old_have_regs_of_mode, + sizeof (have_regs_of_mode)); to switch back, but the idea is to replace that with: push_function_decl (node->decl); ... pop_function_decl (); Richard
