https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107385
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2022-10-24
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Expand is doing:
(insn 3 24 9 6 (set (reg/v:SI 82 [ <retval> ])
(const_int 6 [0x6])) "/app/example.cpp":4:7 -1
(nil))
(insn 9 3 14 6 (set (reg/v:SI 82 [ <retval> ])
(reg:SI 83 [ x ])) "/app/example.cpp":3:5 -1
(nil))
>From this IR:
<bb 2> [local count: 1073741824]:
__asm__ goto("//" : "=r" x_2 : : : "bar" <L3>);
goto <bb 4>; [35.00%]
<bb 3> [local count: 697932184]:
<L3>:
<bb 4> [local count: 1073741824]:
# x_1 = PHI <x_2(3), 6(2)>
bar:
Note 6 does not need to be a constant here, it could be anything.
I suspect when the inline-asm goto is being expanded, it adds the assignment to
reg 82 on all edges going out of the inline-asm but then messing up because
there is some extra code due to the phi node.
