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H.J. Lu 3edc21af52 x86: Add cmpmemsi for -minline-all-stringops 
We used to expand memcmp to "repz cmpsb" via cmpstrnsi.  It was changed
by

commit 9b0f6f5e51
Author: Nick Clifton <nickc@redhat.com>
Date:   Fri Aug 12 16:26:11 2011 +0000

    builtins.c (expand_builtin_memcmp): Do not use cmpstrnsi pattern.

            * builtins.c (expand_builtin_memcmp): Do not use cmpstrnsi
            pattern.
            * doc/md.texi (cmpstrn): Note that the comparison stops if both
            fetched bytes are zero.
            (cmpstr): Likewise.
            (cmpmem): Note that the comparison does not stop if both of the
            fetched bytes are zero.

Duplicate the cmpstrn pattern for cmpmem.  The only difference is that
the length argument of cmpmem is guaranteed to be less than or equal to
lengths of 2 memory areas.  Since "repz cmpsb" can be much slower than
memcmp function implemented with vector instruction, see

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052

expand cmpmem to "repz cmpsb" only for -minline-all-stringops.

gcc/

	PR target/95151
	* config/i386/i386-expand.c (ix86_expand_cmpstrn_or_cmpmem): New
	function.
	* config/i386/i386-protos.h (ix86_expand_cmpstrn_or_cmpmem): New
	prototype.
	* config/i386/i386.md (cmpmemsi): New pattern.

gcc/testsuite/

	PR target/95151
	* gcc.target/i386/pr95151-1.c: New test.
	* gcc.target/i386/pr95151-2.c: Likewise.
	* gcc.target/i386/pr95151-3.c: Likewise.
	* gcc.target/i386/pr95151-4.c: Likewise.
2020-10-26 04:06:32 -07:00
config Fixup config/ChangeLog. 2020-09-10 10:17:51 +02:00
contrib Daily bump. 2020-09-22 00:16:31 +00:00
fixincludes Daily bump. 2020-10-04 00:16:21 +00:00
gcc x86: Add cmpmemsi for -minline-all-stringops 2020-10-26 04:06:32 -07:00
gnattools
gotools
include Daily bump. 2020-09-25 00:16:27 +00:00
INSTALL
intl
libada
libatomic Daily bump. 2020-10-12 00:16:25 +00:00
libbacktrace Daily bump. 2020-10-21 00:16:36 +00:00
libcc1 Daily bump. 2020-10-15 00:16:34 +00:00
libcpp Daily bump. 2020-10-21 00:16:36 +00:00
libdecnumber Daily bump. 2020-07-31 00:16:26 +00:00
libffi Daily bump. 2020-09-25 00:16:27 +00:00
libgcc Daily bump. 2020-10-24 00:16:29 +00:00
libgfortran Daily bump. 2020-10-19 00:16:22 +00:00
libgo net/http/cgi: merge upstream changes to default env vars 2020-10-23 16:55:57 -07:00
libgomp Daily bump. 2020-10-22 08:28:22 +00:00
libhsail-rt
libiberty Daily bump. 2020-10-07 00:16:35 +00:00
libitm Daily bump. 2020-10-02 00:16:27 +00:00
libobjc Daily bump. 2020-10-12 00:16:25 +00:00
liboffloadmic
libphobos Daily bump. 2020-10-13 00:16:26 +00:00
libquadmath
libsanitizer ASAN: Support detect_invalid_pointer_pairs=1 with detect_stack_use_after_return=1 2020-10-21 09:27:08 +02:00
libssp
libstdc++-v3 libstdc++: Add missing exception-specifications in shared_ptr 2020-10-26 10:15:45 +00:00
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maintainer-scripts
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ChangeLog Daily bump. 2020-10-07 00:16:35 +00:00
ChangeLog.jit
ChangeLog.tree-ssa
compile
config-ml.in
config.guess
config.rpath
config.sub
configure configure: Fix in-tree building of GMP on BSD [PR97302] 2020-10-06 11:49:34 +02:00
configure.ac configure: Fix in-tree building of GMP on BSD [PR97302] 2020-10-06 11:49:34 +02:00
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MAINTAINERS MAINTAINERS: Add myself for write after approval. 2020-09-18 15:31:46 +01:00
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README 

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.