https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124818
Bug ID: 124818
Summary: RV32 Zbkb ICE on simple OR with 0x20000
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: cmuellner at gcc dot gnu.org
Target Milestone: ---
The RV32 compiler crashes with an internal compiler error when compiling a
trivial bitwise OR assignment if `Zbkb` is enabled.
Reproducer (-O2 -march=rv32gc_zbkb -mabi=ilp32d):
int f(unsigned int *flags) {
*flags |= 0x20000U;
return 1;
}
ICE details:
issue-zbkb-ice-repro.c: In function 'f':
issue-zbkb-ice-repro.c:4:1: error: unrecognizable insn:
4 | }
| ^
(insn 8 7 9 2 (set (reg:SI 135 [ _2 ])
(ior:SI (reg:SI 134 [ _1 ])
(const_int 131072 [0x20000]))) "issue-zbkb-ice-repro.c":2:12 -1
(nil))
during RTL pass: vregs
issue-zbkb-ice-repro.c:4:1: internal compiler error: in extract_insn,
at recog.cc:2892
Backtrace:
0x29b65fd internal_error(char const*, ...)
0x6803b5 fancy_abort(char const*, int, char const*)
0x4fa100 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
0x4fa11c _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
0x4f8935 extract_insn(rtx_insn*)
0xa3ef13 instantiate_virtual_regs_in_insn
0xa3ef13 instantiate_virtual_regs
0xa3ef13 execute
Reduced trigger conditions:
- `-march=rv32gc`: OK
- `-march=rv32gc_zbb`: OK
- `-march=rv32gc_zknh`: OK
- `-march=rv32gc_zksh`: OK
- `-march=rv32gc_zbkb`: ICE
I have a fix that I will send on the list once I have allocated a PR number.
