https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111296
Bug ID: 111296
Summary: RISC-V vector: ICE in lra_split_hard_reg_for during
reload pass
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: ---
The following issue was identified while attempting to compile SPEC CPU 2017
641.leela_s benchmark.
Reproducer (test.cc):
struct a
{
int b;
int c;
};
int d;
a
e ()
{
a f;
int g = d - 1, h = d / 2 - 1;
f.b = g;
f.c = h;
return f;
}
Compiled with:
riscv64-unknown-linux-gnu-g++ -std=c++03 -march=rv64gcv -mabi=lp64d -c \
-Ofast -ftree-vectorize --param=riscv-autovec-preference=scalable \
test.cpp
Output is:
test.cpp: In function 'a e()':
test.cpp:15:1: error: unable to find a register to spill
15 | }
| ^
test.cpp:15:1: error: this is the insn:
(insn 59 69 68 2 (set (subreg:V2SI (reg:DI 181) 0)
(if_then_else:V2SI (unspec:V2BI [
(const_vector:V2BI [
(const_int 1 [0x1]) repeated x2
])
(const_int 2 [0x2]) repeated x3
(const_int 0 [0])
(reg:SI 66 vl)
(reg:SI 67 vtype)
] UNSPEC_VPREDICATE)
(plus:V2SI (reg:V2SI 182 [141])
(const_vector:V2SI [
(const_int -1 [0xffffffffffffffff]) repeated x2
]))
(unspec:V2SI [
(reg:SI 0 zero)
] UNSPEC_VUNDEF))) "test.cpp":15:1 3122 {pred_addv2si}
(expr_list:REG_DEAD (reg:V2SI 182 [141])
(expr_list:REG_DEAD (reg:SI 67 vtype)
(expr_list:REG_DEAD (reg:SI 66 vl)
(expr_list:REG_DEAD (reg:SI 0 zero)
(nil))))))
during RTL pass: reload
test.cpp:15:1: internal compiler error: in lra_split_hard_reg_for, at
lra-assigns.cc:1861
0x9bab61 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/jeremy/gittrees/mustang/gcc/gcc/rtl-error.cc:108
0x1203e80 lra_split_hard_reg_for()
/home/jeremy/gittrees/mustang/gcc/gcc/lra-assigns.cc:1861
0x11fdaf5 lra(_IO_FILE*)
/home/jeremy/gittrees/mustang/gcc/gcc/lra.cc:2495
0x11b4dd9 do_reload
/home/jeremy/gittrees/mustang/gcc/gcc/ira.cc:5970
0x11b4dd9 execute
/home/jeremy/gittrees/mustang/gcc/gcc/ira.cc:6156
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=g8451fbd5687 --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 20230904 (experimental) (g8451fbd5687)
