https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113109
--- Comment #3 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
It's __builtin_eh_return( that's miscompiled, such that the "handler" isn't
installed and the calling function will return to its caller instead of the
handler.
For the example below:
void f(__UINTPTR_TYPE__ p1, void *p2)
{
__builtin_eh_return(p1, p2);
}
...there's a tell-tale diff between 6673 and 6674 in generated assembly code at
-O2:
@@ -23,7 +23,6 @@ _f:
move.d $r13,[$sp]
.LCFI5:
move.d $r10,$r9
- move.d $r11,[$sp+16]
move.d [$sp+],$r13
move.d [$sp+],$r12
move.d [$sp+],$r11
cris.h defines EH_RETURN_HANDLER_RTX (as a call to cris_return_addr_rtx
yielding) gen_rtx_MEM (Pmode, plus_constant (Pmode, virtual_incoming_args_rtx,
-4)).
I'm "guessing" that the problem with the patch, is that anything any port
stores through a pointer based on virtual_incoming_args_rtx before returning,
is now eliminated.
