https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124341
Bug ID: 124341
Summary: invalid write mask of vcvt2ph2hf8 with -masm=intel
Product: gcc
Version: 16.0
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 63813
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63813&action=edit
reduced testcase
Output:
$ x86_64-pc-linux-gnu-gcc -mavx10.2 -masm=intel testcase.c
/tmp/cchp1mTq.s: Assembler messages:
/tmp/cchp1mTq.s:42: Error: `ymm0' can't be used for write mask
The instruction:
vcvt2ph2hf8 ymm0{ymm0}, ymm1, ymm2 # 17 [c=16 l=16]
vcvt2ph2hf8v16hf_mask
is using write mask k1 with att syntax:
vcvt2ph2hf8 %ymm2, %ymm1, %ymm0{%k1} # 17 [c=16 l=16]
vcvt2ph2hf8v16hf_mask
$ 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-20260303095538-r16-7861-g0399019276a0e2-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.1/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 --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 --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20260303095538-r16-7861-g0399019276a0e2-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.1 20260303 (experimental) (GCC)
