https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115142
Bug ID: 115142
Summary: [14/15 Regression] Unrecognizable insn in
extract_insn, at recog.cc:2812 with -ftree-ter
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at rivosinc dot com
Target Milestone: ---
Testcase:
long a;
char b;
void e() {
char f[8][1];
b = f[a][a];
}
Backtrace:
> /scratch/tc-testing/tc-apr-4/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
> -ftree-ter red.c
red.c: In function 'e':
red.c:6:1: error: unrecognizable insn:
6 | }
| ^
(insn 6 5 7 2 (set (reg:DI 138)
(ashift:DI (mem/c:DI (symbol_ref:DI ("a") [flags 0x6] <var_decl
0x75ae5321cb40 a>) [1 a+0 S8 A64])
(const_int 1 [0x1]))) "red.c":5:11 -1
(nil))
during RTL pass: vregs
red.c:6:1: internal compiler error: in extract_insn, at recog.cc:2812
0xa97591 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../../gcc/gcc/rtl-error.cc:108
0xa975b3 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../../gcc/gcc/rtl-error.cc:116
0xa95e87 extract_insn(rtx_insn*)
../../../gcc/gcc/recog.cc:2812
0xf5e21e instantiate_virtual_regs_in_insn
../../../gcc/gcc/function.cc:1611
0xf5e21e instantiate_virtual_regs
../../../gcc/gcc/function.cc:1994
0xf5e21e execute
../../../gcc/gcc/function.cc:2041
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Godbolt: https://godbolt.org/z/ab7eh3o3E
Affects RISC-V, Loongarch64
Found via fuzzer.
