Created attachment 52110 [details] reduced testcase This seems to be a recent regression. Compiler output: $ x86_64-pc-linux-gnu-gcc -mno-sse2 testcase.c during RTL pass: reload testcase.c: In function 'foo': testcase.c:9:1: internal compiler error: in emit_move_multi_word, at expr.c:3870 9 | } | ^ 0x6c6c3b emit_move_multi_word /repo/gcc-trunk/gcc/expr.c:3870 0xfa3d0b gen_move_insn(rtx_def*, rtx_def*) /repo/gcc-trunk/gcc/expr.c:4145 0x11ade8d curr_insn_transform /repo/gcc-trunk/gcc/lra-constraints.c:4214 0x11af026 lra_constraints(bool) /repo/gcc-trunk/gcc/lra-constraints.c:5161 0x1199994 lra(_IO_FILE*) /repo/gcc-trunk/gcc/lra.c:2336 0x114c429 do_reload /repo/gcc-trunk/gcc/ira.c:5932 0x114c429 execute /repo/gcc-trunk/gcc/ira.c:6118 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-r12-6173-20220102211314-g9ff206d3865-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/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 --with-cloog --with-ppl --with-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-r12-6173-20220102211314-g9ff206d3865-checking-yes-rtl-df-extra-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 12.0.0 20220102 (experimental) (GCC)
Started with r12-6173-g9ff206d3865df5cb8407490aa9481029beac087f
Created attachment 52111 [details] Proposed patch Patch in testing.
The master branch has been updated by Uros Bizjak <uros@gcc.gnu.org>: https://gcc.gnu.org/g:1096ab1775636f35de9c6661f8f71f03299af998 commit r12-6194-g1096ab1775636f35de9c6661f8f71f03299af998 Author: Uros Bizjak <ubizjak@gmail.com> Date: Mon Jan 3 20:58:16 2022 +0100 i386: Always enable mov<V_32:mode> patterns [PR103894] Middle end tries to generate V4QImode moves to implement V2QImode inserts and calls emit_move_multi_word when V4QImode moves are unavailable, as is the case with 32-bit vector moves, constrainted with TARGET_SSE2. However, this triggers gcc_assert (mode_size >= UNITS_PER_WORD); in emit_move_multi_word, since mode_size of V4QImode operand is less than UNITS_PER_WORD of 64-bit targets. The patch unconditionally enables 32-bit vector moves to match 16-bit vector moves. This also enables implementation of 32-bit vector logic operations with GPR in a follow-up patch. 2022-01-03 Uroš Bizjak <ubizjak@gmail.com> gcc/ChangeLog: PR target/103894 * config/i386/mmx.md (mov<V_32:mode>): Remove TARGET_SSE2 constraint. (mov<V_32:mode>_internal): Ditto. (*push<V_32:mode>_rex64): Ditto. (movmisalign<V_32:mode>): Ditto. (*push<V_32:mode>_rex64 splitter): Enable for TARGET_64BIT && TARGET_SSE. (*push<V_32:mode>2): Remove insn pattern. gcc/testsuite/ChangeLog: PR target/103894 * gcc.target/i386/pr103894.c: New test.
Fixed.