https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112494
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2023-11-12
Ever confirmed|0 |1
Component|target |rtl-optimization
Status|UNCONFIRMED |NEW
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Combine pass is trying to combine:
Trying 5 -> 8:
5: r98:DI=0xd7
8: flags:CCZ=cmp(r98:DI,0)
REG_EQUAL cmp(0xd7,0)
where:
(insn 5 2 6 2 (set (reg/v:DI 98 [ flags ])
(const_int 215 [0xd7])) "pr112494.c":10:26 84 {*movdi_internal}
(nil))
(insn 8 7 11 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg/v:DI 98 [ flags ])
(const_int 0 [0]))) "pr112494.c":12:9 8 {*cmpdi_ccno_1}
(expr_list:REG_EQUAL (compare:CCZ (const_int 215 [0xd7])
(const_int 0 [0]))
(nil)))
and calls ix86_cc_mode with:
Breakpoint 1, ix86_cc_mode (code=code@entry=SET, op0=0x7fffe3e37680,
op1=0x7fffea209490)
code = SET will trigger gcc_unreachable() at the end of the ix86_cc_mode
function.
Confirmed as a generic RTL optimization problem.
