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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113109] [14 Regression] g++ EH tests fail at
 execution time for cris-elf after r14-6674-g4759383245ac97
Date: Sat, 23 Dec 2023 02:42:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113109

--- 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 cod=
e 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_r=
tx,
-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 returnin=
g,
is now eliminated.=