https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106116
--- Comment #4 from Petr Skocik <pskocik at gmail dot com> ---
It would be interesting to do this at the assembler level, effectively
completely turning what's equivalent to `jmp 1f; 1:` to nothing. This would
also be in line with the GNU assembler's apparent philosophy that jmp is a
high-level variadic-length instruction (either jmp, or jmpq, whichever is
possible first => this could become: nothing, jmp, or jmpq).
I have a bunch of multiparam functions such with supporting functions
structured
as follows:
void func_A(int A){ func_AB(DEFAULT_C); }
void func_AB(int A, int B){ func_ABC(A,B,DEFAULT_C); }
void func_ABC(int A, int B, int C){ func_ABCD(A,B,C,DEFAULT_D); }
void func_ABC(int A, int B, int C, int D){
//...
}
which could size-wise benefit from eliding the jumps, turning them into
fallthrus this way, but yeah, probably not worth the effort (unless somebody
knows how to easily hack gas to do it).
