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0e6c51de8e
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Hans-Peter Nilsson 0e6c51de8e reorg.c (fill_slots_from_thread): Improve for TARGET_FLAGS_REGNUM 
This handles TARGET_FLAGS_REGNUM clobbering insns as delay-slot
fillers using a method similar to that in commit 33c2207d3f,
where care was taken for fill_simple_delay_slots to allow such
insns when scanning for delay-slot fillers *backwards* (before
the insn).

A TARGET_FLAGS_REGNUM target is typically a former cc0 target.
For cc0 targets, insns don't mention clobbering cc0, so the
clobbers are mentioned in the "resources" only as a special
entity and only for compare-insns and branches, where the cc0
value matters.

In contrast, with TARGET_FLAGS_REGNUM, most insns clobber it and
the register liveness detection in reorg.c / resource.c treats
that as a blocker (for other insns mentioning it, i.e. most)
when looking for delay-slot-filling candidates.  This means that
when comparing core and performance for a delay-slot cc0 target
before and after the de-cc0 conversion, the inability to fill a
delay slot after conversion manifests as a regression.  This was
one such case, for CRIS, with random_bitstring in
gcc.c-torture/execute/arith-rand-ll.c as well as the target
libgcc division function.

After this, all known performance regressions compared to cc0
are fixed.

gcc:
	PR target/93372
	* reorg.c (fill_slots_from_thread): Allow trial insns that clobber
	TARGET_FLAGS_REGNUM as delay-slot fillers.

gcc/testsuite:
	PR target/93372
	* gcc.target/cris/pr93372-47.c: New test.
2020-08-24 03:15:21 +02:00
config Daily bump. 2020-08-21 00:16:23 +00:00
contrib Daily bump. 2020-07-30 00:16:24 +00:00
fixincludes Allow CONFIG_SHELL to override build-time shell in mkheaders 2020-02-20 22:09:03 -03:00
gcc reorg.c (fill_slots_from_thread): Improve for TARGET_FLAGS_REGNUM 2020-08-24 03:15:21 +02:00
gnattools PR81878: fix --disable-bootstrap --enable-languages=ada 2018-11-20 00:07:47 +00:00
gotools libgo: update to Go1.14beta1 2020-01-21 23:53:22 -08:00
include Daily bump. 2020-08-04 00:16:24 +00:00
INSTALL
intl intl: Unbreak intl build with bison 3 when no regeneration is needed [PR92008] 2020-04-16 11:55:00 +02:00
libada Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
libatomic Daily bump. 2020-07-15 00:16:35 +00:00
libbacktrace Daily bump. 2020-07-31 00:16:26 +00:00
libcc1 Daily bump. 2020-08-15 00:16:22 +00:00
libcpp Daily bump. 2020-07-31 00:16:26 +00:00
libdecnumber Daily bump. 2020-07-31 00:16:26 +00:00
libffi libffi/test: Fix compilation for build sysroot 2020-04-25 21:27:14 +01:00
libgcc Daily bump. 2020-08-14 00:16:24 +00:00
libgfortran Daily bump. 2020-08-21 00:16:23 +00:00
libgo libgo: correctly handle AIX FAT library creation 2020-08-12 11:33:54 -07:00
libgomp Daily bump. 2020-08-21 00:16:23 +00:00
libhsail-rt Add `--with-toolexeclibdir=' configuration option 2020-01-24 11:24:25 +00:00
libiberty Daily bump. 2020-08-04 00:16:24 +00:00
libitm Daily bump. 2020-07-25 00:16:22 +00:00
libobjc Daily bump. 2020-05-30 00:16:27 +00:00
liboffloadmic Add missing ChangeLog entries. 2020-05-05 16:10:13 +02:00
libphobos Daily bump. 2020-06-26 00:16:23 +00:00
libquadmath Daily bump. 2020-05-30 00:16:27 +00:00
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.dir-locals.el
.gitattributes Add *.md diff=md. 2020-01-15 14:29:53 +01:00
.gitignore Add .clang-tidy to git ignored. 2020-06-12 16:03:02 +02:00
ABOUT-NLS
ar-lib Update GCC to autoconf 2.69, automake 1.15.1 (PR bootstrap/82856). 2018-10-31 17:03:16 +00:00
ChangeLog Daily bump. 2020-08-21 00:16:23 +00:00
ChangeLog.jit
ChangeLog.tree-ssa
compile
config-ml.in MSP430: Add -fno-exceptions multilib 2019-12-11 19:19:50 +00:00
config.guess Update config.sub and config.guess. 2019-09-09 11:14:32 +02:00
config.rpath
config.sub Update config.sub and config.guess. 2019-09-09 11:14:32 +02:00
configure configure: Also check C++11 (flags) for ${build} compiler not only for ${host} 2020-08-20 21:59:00 +02:00
configure.ac configure: Also check C++11 (flags) for ${build} compiler not only for ${host} 2020-08-20 21:59:00 +02:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.RUNTIME
depcomp
install-sh
libtool-ldflags
libtool.m4 [ARM/FDPIC v6 02/24] [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts 2019-09-10 09:37:00 +02:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh Do not use HAVE_DOS_BASED_FILE_SYSTEM for Cygwin. 2020-04-17 09:22:51 +02:00
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS MAINTAINERS: Add myself for write after approval 2020-08-16 09:28:10 +01:00
Makefile.def Merge top-level configury changes from gdb 2020-04-09 06:52:55 -06:00
Makefile.in Merge top-level configury changes from gdb 2020-04-09 06:52:55 -06:00
Makefile.tpl Makefile.tpl (HOST_EXPORTS): Add CXX_FOR_BUILD. 2019-08-23 15:37:22 -06:00
missing
mkdep
mkinstalldirs
move-if-change
multilib.am Update GCC to autoconf 2.69, automake 1.15.1 (PR bootstrap/82856). 2018-10-31 17:03:16 +00:00
README
symlink-tree
test-driver Update GCC to autoconf 2.69, automake 1.15.1 (PR bootstrap/82856). 2018-10-31 17:03:16 +00:00
ylwrap

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.