https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123381
Bug ID: 123381
Summary: ICE: maximum number of generated reload insns per insn
achieved (90) with -mrvv-vector-bits=zvl
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: riscv64-unknown-linux-gnu
Created attachment 63207
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63207&action=edit
reduced testcase
This ICE triggers with various flags on similar testcases,
-mrvv-vector-bits=zvl being the common flag.
Compiler output:
$ riscv64-unknown-linux-gnu-gcc -Ofast -mcpu=xiangshan-kunminghu
-mrvv-vector-bits=zvl -fno-tree-ccp -fno-vect-cost-model testcase.c
during RTL pass: reload
testcase.c: In function 'foo':
testcase.c:8:1: internal compiler error: maximum number of generated reload
insns per insn achieved (90)
8 | }
| ^
0x3644ced internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0x1766530 lra_constraints(bool)
/repo/gcc-trunk/gcc/lra-constraints.cc:5566
0x174c1b4 lra(_IO_FILE*, int)
/repo/gcc-trunk/gcc/lra.cc:2455
0x16f4fef do_reload
/repo/gcc-trunk/gcc/ira.cc:6070
0x16f4fef execute
/repo/gcc-trunk/gcc/ira.cc:6258
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20260102095611-r16-6464-g254a858ae7ae14-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/16.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--enable-libsanitizer --with-isa-spec=2.2
--with-sysroot=/usr/riscv64-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20260102095611-r16-6464-g254a858ae7ae14-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20260102 (experimental) (GCC)
