https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83623
Bug ID: 83623
Summary: [8 Regression] ICE: in convert_move, at expr.c:248
with -march=knl and 16bit vector bswap/rotate
Product: gcc
Version: 8.0
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: x86_64-pc-linux-gnu
Created attachment 42982
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42982&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -march=knl testcase.c
during RTL pass: expand
testcase.c: In function 'foo':
testcase.c:6:14: internal compiler error: in convert_move, at expr.c:248
x = x << 8 | x >> 8;
~~~~~~~^~~~~~~~
0x9858cc convert_move(rtx_def*, rtx_def*, int)
/repo/gcc-trunk/gcc/expr.c:248
0x985d25 convert_modes(machine_mode, machine_mode, rtx_def*, int)
/repo/gcc-trunk/gcc/expr.c:706
0xbf7f21 maybe_legitimize_operand
/repo/gcc-trunk/gcc/optabs.c:7096
0xbf7f21 maybe_legitimize_operands(insn_code, unsigned int, unsigned int,
expand_operand*)
/repo/gcc-trunk/gcc/optabs.c:7145
0xbf8589 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
/repo/gcc-trunk/gcc/optabs.c:7163
0xc0265f expand_unop_direct
/repo/gcc-trunk/gcc/optabs.c:2694
0xc00786 expand_unop(machine_mode, optab_tag, rtx_def*, rtx_def*, int)
/repo/gcc-trunk/gcc/optabs.c:2736
0x96cd23 expand_variable_shift(tree_code, machine_mode, rtx_def*, tree_node*,
rtx_def*, int)
/repo/gcc-trunk/gcc/expmed.c:2661
0x995dbf expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/repo/gcc-trunk/gcc/expr.c:9310
0x8486e3 expand_gimple_stmt_1
/repo/gcc-trunk/gcc/cfgexpand.c:3729
0x8486e3 expand_gimple_stmt
/repo/gcc-trunk/gcc/cfgexpand.c:3790
0x84a29d expand_gimple_basic_block
/repo/gcc-trunk/gcc/cfgexpand.c:5797
0x84fe06 execute
/repo/gcc-trunk/gcc/cfgexpand.c:6403
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-256032-checking-yes-rtl-df-extra-nobootstrap-nographite-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --without-cloog --without-ppl --without-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-256032-checking-yes-rtl-df-extra-nobootstrap-nographite-amd64
Thread model: posix
gcc version 8.0.0 20171229 (experimental) (GCC)
