https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116282
Bug ID: 116282
Summary: [15 Regression] RISC-V rv64id_zba_zbkb ICE: could not
split insn
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:
short a;
long b;
char c, d;
void e(int f[][4][24][4], long g[][24][24][24]) {
for (unsigned h = 2;; h = 3)
for (long i = 0; i < 4; i = 5006368639)
for (int j = 0; j < 4; j = 4) {
for (long k = -4294967294; k < (c ?: f[0][2][6][j]); k += b)
a = g[k][j][0][h];
for (; f ? d : 0;)
;
}
}
Command:
> /scratch/tc-testing/tc-compiler-fuzz-trunk/build-gcv/bin/riscv64-unknown-linux-gnu-gcc
> -O3 -march=rv64id_zba_zbkb -c -o /dev/null func.c
func.c: In function 'e':
func.c:13:1: error: could not split insn
13 | }
| ^
(insn 78 136 137 (parallel [
(set (reg:DI 15 a5 [orig:196 _16 ] [196])
(plus:DI (ashift:DI (reg/v:DI 15 a5 [orig:138 h ] [138])
(const_int 3 [0x3]))
(const_int -474989022978048 [0xfffe500000036000])))
(clobber (reg:DI 12 a2 [213]))
]) 466 {*riscv.md:4340}
(expr_list:REG_UNUSED (reg:DI 12 a2 [213])
(nil)))
during RTL pass: final
func.c:13:1: internal compiler error: in final_scan_insn_1, at final.cc:2807
0x2de6365 internal_error(char const*, ...)
../../../gcc/gcc/diagnostic-global-context.cc:491
0xc50982 fancy_abort(char const*, int, char const*)
../../../gcc/gcc/diagnostic.cc:1772
0xae39b5 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../../gcc/gcc/rtl-error.cc:108
0xa70544 final_scan_insn_1
../../../gcc/gcc/final.cc:2807
0xf61b2f final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
../../../gcc/gcc/final.cc:2886
0xf61c1c final_1
../../../gcc/gcc/final.cc:1977
0xf627e8 rest_of_handle_final
../../../gcc/gcc/final.cc:4239
0xf627e8 execute
../../../gcc/gcc/final.cc:4317
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/9EM1fPKh7
Found via fuzzer
