https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125266
Bug ID: 125266
Summary: default_function_abi may not be the default function
ABI
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
default_function_abi is initialized by
default_function_abi.initialize (0, regs_invalidated_by_call);
called from init_reg_sets_1 (), which calls
targetm.conditional_register_usage ();
targetm.conditional_register_usage () can change call_used_regs and
fixed_regs based on function attributes, like preserve_none,
no_caller_saved_registers and no_callee_saved_registers. As the
result, default_function_abi is the function ABI for the current function,
which may bot be the same as the default function ABI for call clobbered
registers.
