https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98601
Alex Coplan <acoplan at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|aarch64: ICE in |[8/9/10/11 Regression]
|rtx_addr_can_trap_p_1, at |aarch64: ICE in
|rtlanal.c:467 |rtx_addr_can_trap_p_1, at
| |rtlanal.c:467
Target|aarch64 |arm aarch64
--- Comment #1 from Alex Coplan <acoplan at gcc dot gnu.org> ---
ICEs started with GCC 8. GCC 7 accepts the code with a warning (warning:
dereferencing 'void *' pointer).
Clearly we should fix the ICE, but I'm wondering whether this code is actually
valid?
clang rejects it with "error: dereference of pointer to incomplete type 'void'"
x86-64 GCC rejects it with:
<source>:3:3: error: invalid use of void expression
3 | asm("" : "=Q"(*b));
| ^~~
<source>:3:3: error: invalid lvalue in 'asm' output 0
We also hit the same ICE with this testcase on AArch32, FWIW.
