https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67856
--- Comment #2 from Andy Lutomirski <luto at mit dot edu> --- (In reply to Segher Boessenkool from comment #1) > The call to "a" needs the prologue, maybe to align the stack? The "subq $8, %rsp" is for stack alignment, and whether it's emitted depends on the parity of the number of pushes. I have no problem with it. The problem is that rbx and rbp are pushed. They shouldn't be. In a real function, it's worse: rbx, rbp, r12, r13, r14, and r15 all get pushed unnecessarily. I just had a bunch of fun refactoring my big Linux entry code rewrite to minimize the amount of pain that this issue causes.
