https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95355
Bug ID: 95355 Summary: [11 Regression] Assembler messages: Error: operand size mismatch for `vpmovzxbd' with -masm=intel Product: gcc Version: 11.0 Status: UNCONFIRMED Keywords: assemble-failure 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 48614 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48614&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -O -fno-tree-dominator-opts -fno-tree-fre -ftree-slp-vectorize -fno-tree-ter -mavx512dq -masm=intel testcase.c /tmp/cc4ZYLWX.s: Assembler messages: /tmp/cc4ZYLWX.s:27: Error: operand size mismatch for `vpmovzxbd' $ 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-r11-648-20200526221715-gbc48456d085-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/11.0.0/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 --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-r11-648-20200526221715-gbc48456d085-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.0.0 20200526 (experimental) (GCC) The offending instruction is: vpmovzxbd zmm0, QWORD PTR [rsp+32]