https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110950
Bug ID: 110950
Summary: RISC-V vector ICE in expand_const_vector
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jeremy.bennett at embecosm dot com
Target Milestone: ---
Created attachment 55708
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55708&action=edit
C source
The following code (testcase.c) causes an ICE when using RISC-V vector as
target.
a;
b() {
long *c = 0;
int *d;
for (; a; ++a)
c[a] = d[-a];
}
Compiled with
riscv64-unknown-linux-gnu-gcc -march=rv64gcv -mabi=lp64d \
-c -Ofast --param=riscv-autovec-preference=scalable \
testcase.c
Output is
testcase.c:1:1: warning: data definition has no type or storage class
1 | a;
| ^
testcase.c:1:1: warning: type defaults to 'int' in declaration of 'a'
[-Wimplicit-int]
testcase.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
2 | b() {
| ^
during RTL pass: expand
testcase.c: In function 'b':
testcase.c:6:10: internal compiler error: in expand_const_vector, at
config/riscv/riscv-v.cc:1510
6 | c[a] = d[-a];
| ~~~~~^~~~~~~
0x8e70b6 expand_const_vector
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/riscv-v.cc:1510
0x14a4df4 riscv_vector::legitimize_move(rtx_def*, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/riscv-v.cc:1524
0x184044f gen_movrvvm8qi(rtx_def*, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/vector.md:1054
0xc56b57 rtx_insn* insn_gen_fn::operator()<rtx_def*, rtx_def*>(rtx_def*,
rtx_def*) const
/home/jeremy/gittrees/mustang/gcc/gcc/recog.h:407
0xc56b57 emit_move_insn_1(rtx_def*, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:4164
0xc56f65 emit_move_insn(rtx_def*, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:4334
0xc2c4cd force_reg(machine_mode, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/explow.cc:693
0x14a2cee shuffle_generic_patterns
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/riscv-v.cc:3120
0x14a2cee expand_vec_perm_const_1
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/riscv-v.cc:3151
0x14a32b3 riscv_vector::expand_vec_perm_const(machine_mode, machine_mode,
rtx_def*, rtx_def*, rtx_def*, vec_perm_indices const&)
/home/jeremy/gittrees/mustang/gcc/gcc/config/riscv/riscv-v.cc:3203
0xefe0ce expand_vec_perm_const(machine_mode, rtx_def*, rtx_def*,
int_vector_builder<poly_int<2u, long> > const&, machine_mode, rtx_def*)
/home/jeremy/gittrees/mustang/gcc/gcc/optabs.cc:6508
0xc4f682 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:10453
0xc53c58 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:10805
0xc4cb7a expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:9010
0xc4cb7a expand_expr(tree_node*, rtx_def*, machine_mode, expand_modifier)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.h:310
0xc4cb7a expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:9345
0xc53c58 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:10805
0xc6062d store_expr(tree_node*, rtx_def*, int, bool, bool)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:6325
0xc62201 expand_assignment(tree_node*, tree_node*, bool)
/home/jeremy/gittrees/mustang/gcc/gcc/expr.cc:6043
0xb1f05c expand_gimple_stmt_1
/home/jeremy/gittrees/mustang/gcc/gcc/cfgexpand.cc:3946
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.
System information
------------------
Using built-in specs.
COLLECT_GCC=./riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/home/jeremy/gittrees/mustang/install/libexec/gcc/riscv64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /home/jeremy/gittrees/mustang/gcc/configure
--target=riscv64-unknown-linux-gnu
--prefix=/home/jeremy/gittrees/mustang/install
--with-sysroot=/home/jeremy/gittrees/mustang/install/sysroot
--with-pkgversion=gf9d93f8cc24 --with-system-zlib --enable-shared --enable-tls
--enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
--disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap
--src=/home/jeremy/gittrees/mustang/gcc --enable-multilib --with-abi=lp64d
--with-arch=rv64gc --with-tune= --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2
-mcmodel=medany' 'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medany'
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230807 (experimental) (gf9d93f8cc24)
