I had a look at the missing target hook TARGET_ATOMIC_ASSIGN_EXPAND_FENV
to fix the C11 memory model testcase in regressions in trunk.
I looked at the x86 implementation of this target hooks and x86 has
instructions (FNSTENV,FLDENV,FNSTSW,FNCLEX) for feholdexcept,
feclearexcept and feupdateenv. Does ARM has something similar? Any
pointers/links I can refer to.
Please see the gcc internal documentation for the target hook below.
— Target Hook: void TARGET_ATOMIC_ASSIGN_EXPAND_FENV (tree *hold, tree
*clear, tree *update)
ISO C11 requires atomic compound assignments that may raise
floating-point exceptions to raise exceptions corresponding to the
arithmetic operation whose result was successfully stored in a
compare-and-exchange sequence. This requires code equivalent to calls to
feholdexcept, feclearexcept and feupdateenv to be generated at
appropriate points in the compare-and-exchange sequence. This hook
should set *hold to an expression equivalent to the call to
feholdexcept, *clear to an expression equivalent to the call to
feclearexcept and *update to an expression equivalent to the call to
feupdateenv. The three expressions are NULL_TREE on entry to the hook
and may be left as NULL_TREE if no code is required in a particular
place. The default implementation leaves all three expressions as
NULL_TREE. The __atomic_feraiseexcept function from libatomic may be of
use as part of the code generated in *update.
Thanks,
Kugan
== Progress ==
- releases (3/10)
* GCC 4.7 and 4.8 releases done
* more cbuild2 feedback
- cross-validations (2/10)
* followup
* adding capability to test a patch over a given revision on several
targets/cpu/fpu/runtestflags
- libsanitizer on AArch64 (3/10)
* most tests are now functional
* still some errors in the GCC testsuite, to be analyzed (there are
some timeouts, too despite using SSH multiplexing to the Foundation
model)
- misc (2/10): conf-calls and meetings
== Next ==
- libsanitizer on AArch64: analyze errors, try QEMU
== Future ==
On sick leave starting Feb 11th
== Progress ==
* Libc probes support for Aarch64 (2/10).
Wrote a small patch for setjmp and longjmp LIBC probe.
Requested "will newton" to test them .
* Investigate "PGO" for Aarch64 (3/10).
Bootstap testing GCC with PGO for GCC.
Stage 2, feedback profile in progress.
Ran coremark on foundation model with PGO.
The benchmark builds with profile-generate and runs.
"gcda" files are generated and uses them to profile.
Profile generated runs does not run cleanly.
Cross checking if the generated profile is valid.
* Resubmmited libssp machine description support in GCC (2/10).
* Cbuild2 discussed with rob, ryan on SYSROOT installation while building (1/10)
cross compiler for aarch64. "SYSROOT" is expected to be in
/opt/linaro, but cbuild2 does not do this by default.
Misc (1/10)
-------------
AMD internal meetings and did some investigations
== Plan ==
- Run EMBCC benchmarks with -PGO enabled.
- Follow up upstream libssp GCC discussions.
* 4 days week (university).
== Issues ==
* none
== Progress ==
* LRA on AArch32:
o TCWG-343 : Make LRA the default for the ARM backend (3/10)
- Looking backend places (ARM and AArch64) where reload_in_progress
is used to verify if lra_in_progress is needed as well: Tested lot of
configurations, testsuite results analysis ongoing.
o TCWG-345 : Analyse performance of LRA for ARM. (0/10)
- No progress this week.
* GMP library AArch64 port review: (4/10)
o Analyzing code generated from C generic implementation vs assembly.
* Misc. (1/10)
o Various meetings.
== Next ==
* Child care (chickenpox)
* Still some time spend at university
* Continue on LRA and lib GMP
== Progress ==
* Implemented per process hwbreakpoint and watchpoint cache for arm
native targets.
Also added a reference count for per thread hardware breaks. [TCWG-177] [7/10]
* Travelled to Islamabad for Macau visa application. [3/10]
== Plan ==
* Continue work on forking/vforking hardware breakpoints support for arm-native.
Tweak hardware breakpoint cache and thread breaks reference count to
get it in sync with linux-native. [TCWG-177]
== Misc ==
- Monday 27/01/2014 - Public holiday
== Progress ==
- LP#1191909: gold and -flto always fails with an internal error on
arm-linux-gnueabi* (2/10)
- Reproduced it and Looking into the implementation for best fix.
-c11-atomic-exec-5.c (4/10)
- Issue is due to missing target hook and looking at implementing
-LP#1270789: gcc 4.8: "invalid expression as operand" in aarch64
inline asm (2/10)
- came-up with the patch. Still in the process of testing it. APM1
disc seems to be corrupt and that is holding this.
- Benchmarking (1/10)
- added -pgo for coremark
- Set-up a Linux desktop (1/10)
== Plan ==
- Continue with trunk daily regression
- Fix assigned bugs
== Progress ==
* Improve binary releases produced by Cbuildv2. (6/10 TCWG-383)
* Minor changes to source releases produced by Cbuildv2. (1/10)
* Added support to Cbuild to use lsbcc for binary releases. (1/10)
* Meetings. (1/10)
* Started reviewing Kugan's benchmarking branch of Cbuildv2. (1/10)
== Plan ==
* Build static gdbserver for target via Cbuildv2.
* Add Win32 installer for Canadian cross built binary
releases to Cbuildv2. (TCWG-381)
* Once Jenkins has a node_selector for the new Beagle Board Blacks,
get those working for native builds. (TCWG-379)
* Get QEMU and Foundation Model running on TCWG x86_64 build slaves
so Jenkins can use them for native builds. (TCWG-380)
== Progress ==
* Add support for AArch32 ARMv8 16<->64bit VCVT to QEMU (2/10, TCWG-51)
* Triage and report AArch64 gcc bug when building glibc with SystemTap (1/10)
* Debug and submit patch for ARM libffi issue (1/10)
* Add support for longjmp/setjmp Systemtap probes on ARM (4/10, TCWG-378)
* Ported Python cffi package to AArch64, submitted upstream (1/10)
* Fixed bug building glibc for armv4 (1/10)
== Issues ==
* Broadband down for 3 hours on Wednesday afternoon
== Plan ==
* Follow up QEMU patches and maybe post v2
* malloc
--
Will Newton
Toolchain Working Group, Linaro
== Progress ==
* Compiler-RT
- Changing CMake to make it compile on ARM
- Reviewing long div/mod patches for ARMv4/v5/v6, testing and benchmarking
* EHABI
- Investigating EH code generation (landing pads, jump tables, libs)
- Running test-suite EH tests, some failures
* Background
- Loads of patch reviews on IAS, build attributes, EHABI, compiler-rt
- Planning the 3.4.1 release (the first patch-release of LLVM)
* Time
- CARD-862 8/10
- Others 2/10
== Plan ==
* Continue EHABI tests, try to turn it on by default
* Continue working on RT's CMake for ARM
* Prepare the FOSDEM 14 presentation
