mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-03-25 15:20:54 +08:00
5abbfd3cd3
This define_insn has two issues.
One is that with -mavx512f -mno-avx512vl it can emit an AVX512VL-only insn
- 128-bit or 256-bit EVEX encoded vpternlog{d,q}.
Another one is that because there is no vpternlog{b,w}, we emit vpternlogd
instead, but then we shouldn't pretend we support masking of that, because
we don't.
The first one can be fixed by forcing the use of %zmm* registers instead of
%xmm* or %ymm* if AVX512F but not AVX512VL, like we do for a couple of other
insns (although that is primarily done in order to support %xmm16+ regs).
But we need to make sure that in that case the input operand isn't memory,
because while we can read and store the higher bits of registers, we don't
want to read from memory more bytes than what we should read.
A variant to these two if_then_else set attrs, condition in the output and
larger condition would be 4 different define_insns (one with something like
VI48_AVX512VL iterator, masking, no g modifiers and "vm" input constraint,
another one with VI48_AVX iterator, !TARGET_AVX512VL in condition,
no masking, g modifiers and "v" input constraint, one with VI12_AVX512VL
iterator, no masking, no g modifiers and "vm" input constraint and last one with
VI12_AVX2 iterator, !TARGET_AVX512VL in condition, no masking, g modifiers
and "v" input constraint, but I think having one pattern is shorter than
that.
2020-03-30 Jakub Jelinek <jakub@redhat.com>
PR target/94343
* config/i386/sse.md (<mask_codefor>one_cmpl<mode>2<mask_name>): If
!TARGET_AVX512VL, use 512-bit vpternlog and make sure the input
operand is a register. Don't enable masked variants for V*[QH]Imode.
* gcc.target/i386/avx512f-pr94343.c: New test.
* gcc.target/i386/avx512vl-pr94343.c: New test.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.