https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94488
Bug ID: 94488
Summary: [AArch64] ICE from OpenMP SIMD right shift of uint64_t
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: e...@coeus-group.com
Target Milestone: ---
Created attachment 48199
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48199&action=edit
Test case
On AArch64 with optimizations enabled (-O1 is enough), attempting to
right-shift an unsigned 64-bit value in an OpenMP SIMD loop generates an
internal compiler error.
This happens on at least GCC 9 and 10, and I've tried it cross-compiling to
AArch64 and natively (on a Raspberry Pi running Fedora 31 with gcc 9.3.1).
I'm attaching a test case. Here is the full output from attempting to compile
it with `aarch64-linux-gnu-gcc-10 -v -fopenmp-simd -O2 -c -o test.o srl.c`:
Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc-10
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 10-20200324-1'
--with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-libquadmath --disable-libquadmath-support --enable-plugin
--enable-default-pie --with-system-zlib --without-target-system-zlib
--enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=aarch64-linux-gnu --program-prefix=aarch64-linux-gnu-
--includedir=/usr/aarch64-linux-gnu/include
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.0.1 20200324 (experimental) [master revision
596c90d3559:023579257f5:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536] (Debian
10-20200324-1)
COLLECT_GCC_OPTIONS='-v' '-fopenmp-simd' '-O2' '-c' '-o' 'test.o'
'-mlittle-endian' '-mabi=lp64'
/usr/lib/gcc-cross/aarch64-linux-gnu/10/cc1 -quiet -v -imultiarch
aarch64-linux-gnu srl.c -quiet -dumpbase srl.c -mlittle-endian -mabi=lp64
-auxbase-strip test.o -O2 -version -fopenmp-simd -fasynchronous-unwind-tables
-o /tmp/ccGROOBh.s
GNU C17 (Debian 10-20200324-1) version 10.0.1 20200324 (experimental) [master
revision 596c90d3559:023579257f5:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536]
(aarch64-linux-gnu)
compiled by GNU C version 10.0.1 20200324 (experimental) [master
revision 596c90d3559:023579257f5:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536], GMP
version 6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version
isl-0.22.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include/aarch64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc-cross/aarch64-linux-gnu/10/include-fixed"
ignoring nonexistent directory "/usr/include/aarch64-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-cross/aarch64-linux-gnu/10/include
/usr/lib/gcc-cross/aarch64-linux-gnu/10/../../../../aarch64-linux-gnu/include
/usr/include
End of search list.
GNU C17 (Debian 10-20200324-1) version 10.0.1 20200324 (experimental) [master
revision 596c90d3559:023579257f5:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536]
(aarch64-linux-gnu)
compiled by GNU C version 10.0.1 20200324 (experimental) [master
revision 596c90d3559:023579257f5:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536], GMP
version 6.2.0, MPFR version 4.0.2, MPC version 1.1.0, isl version
isl-0.22.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: b59507ef9cd435e859f115f5f55f1a57
during RTL pass: expand
srl.c: In function ‘l’:
srl.c:14:15: internal compiler error: in expand_shift_1, at expmed.c:2654
14 | aj.e[i] = ak.e[i] >> k;
| ~~~~~~~~^~~~~~~~~~~~~~
0x613d01 expand_shift_1
../../src/gcc/expmed.c:2654
0x83dce5 expand_variable_shift(tree_code, machine_mode, rtx_def*, tree_node*,
rtx_def*, int)
../../src/gcc/expmed.c:2695
0x85053b expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
../../src/gcc/expr.c:9477
0x85725d expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../src/gcc/expr.c:10049
0x864dc1 expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
../../src/gcc/expr.c:8353
0x864dc1 expand_normal
../../src/gcc/expr.h:288
0x864dc1 store_field
../../src/gcc/expr.c:7097
0x86178e expand_assignment(tree_node*, tree_node*, bool)
../../src/gcc/expr.c:5369
0x75c908 expand_gimple_stmt_1
../../src/gcc/cfgexpand.c:3749
0x75c908 expand_gimple_stmt
../../src/gcc/cfgexpand.c:3847
0x7627ea expand_gimple_basic_block
../../src/gcc/cfgexpand.c:5887
0x7627ea execute
../../src/gcc/cfgexpand.c:6542
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
