== Progress ==
* Investigated gdb test cases that are failing on
arm-remote gdbserver configuration.
-- Fixed some failures by updating host cross compiler version
-- Fixed some failures by fixing environment issue where not being loaded
properly.
-- All test cases that need to build a shared library and transfer it to
remote target FAIL due to problems which seems like dejaganu limitations.
* Ran GDB test suite on x86_64 remote gdbserver configuration and compared
performance of same configuration on arm.
* Got most documentation ready for Ireland Visa application, still waiting
on invitation letter and hotel booking details.
*** Still No blue-print available to log work in JIRA.
== Plan ==
* Investigate compiler version specific and general failures on arm remote
gdbserver configuration.
* Start on investigation/fixing of arm specific failures in gdb test suite
results.
* Submit Ireland visa application after receiving invitation letter and
hotel booking details.
* Planned Holiday
-- Planned Day off on Friday 12th April 2013 for car checkup in workshop.
== Summary ==
- benchmarking coremark with VRP based extension elimination
* extension elimination in some cases affecting other optimizations
* With this improvements are marginal (details below)
== Plan ==
- study crc where extension elimination is resulting in bad code
- Find a solution
==Details==
If an assignment gimple statement has RHS expression value that can fit
in LHS type, truncation is redundant. Zero/sign extensions are redundant
in this case and rtl statement can be replaced as
from:
(insn 12 11 0 (set (reg:SI 110 [ D.4128 ])
(zero_extend:SI (subreg:HI (reg:SI 117) 0))) c5.c:8 -1
(nil))
to:
(insn 12 11 0 (set (subreg/s/u:HI (reg:SI 110 [ D.4128 ]) 0)
(subreg:HI (reg:SI 117) 0)) c5.c:8 -1
(nil))
With this change, for the following case:
short unPack( unsigned char c )
{
/* Only want lower four bit nibble */
c = c & (unsigned char)0x0F ;
if( c > 7 ) {
/* Negative nibble */
return( ( short )( c - 16 ) ) ;
}
else
{
/* positive nibble */
return( ( short )c ) ;
}
}
asm without elimination
unPack:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
and r0, r0, #15
cmp r0, #7
subhi r0, r0, #16
uxthhi r0, r0
sxth r0, r0
bx lr
.size
asm with elimination
unPack:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
and r0, r0, #15
cmp r0, #7
subhi r0, r0, #16
sxth r0, r0
bx lr
In some cases, changed rtl statement is not eliminated by later passes
and is generated as a mov instruction. Worse, it also seems to affect
the other optimization passes and resulting in worse code for crc. Not
found the cause for it yet.
== Progress ==
* gc sections tests
Completed adding gc-section test cases.
1. TLS and GOT tests.
http://sourceware.org/ml/binutils/2013-03/msg00273.html
2. PLT tests.
http://sourceware.org/ml/binutils/2013-03/msg00273.html
* Evaluate gprof work.
There is one function hook "find_call" which is machine dependent and
is written for i386.c/sparc
Then there are changes in configure.in to add architecture details.
* 1-1 with Matt.
== Plan ==
Continue gprof support work for Aarch64
== Progress ==
* Buildbots
- All ARM build-bots GREEN! Hurray!!! :D
- Improving sort comparison functions makes output reproducible on all
machines
- Fixed fpcmp, which fixes sqlite3 report
- A bad commit broke lots of tests, reverted
- Adding a self-hosting check-all Pandaboard
- In theory, it works, but config is not perfect yet
* Arndale
- Suse image is not stable enough, installed Linaro (325)
- Fathi got GCC bootstrapping with it, should work
- Installed a heat-sink on the board, should reduce problems
- Still got network issues, may be the mac address
- Someone could liaise with Dave Pigott to get a new MAC on the DHCP
* EuroLLVM 2013
- Badges, finishing touches
== Plan ==
* Holidays next week, then
* Check with Galina about Beagle bots
* Finish Panda self-host + test-suite A9 bot
* Gather info and hardware for 3.3 release tests
* Plan for the future!
== Progress ==
* Short week (2 days)
* Tested memcpy on big endian.
* Updated newlib memcpy patch.
* More digging into glibc IFUNC.
== Issues ==
* None.
== Plan ==
* Try and get newlib mempcy patch accepted.
* IFUNC...
--
Will Newton
Toolchain Working Group, Linaro
== Progress ==
* Disable-peeling:
- Still waiting for the results from cbuild. Because of many merges
(pre-release week), there are a lot of jobs in the queue :-(
* Libsanitizer:
- tried to understand why isatty(2) returns true when executing the
testsuite via qemu.
* Neon intrinsics codegen:
- benchmarking in bare-machine shows that GCC is actually ~5% faster
than RVCT on this sample codec.
- to be further discussed internally
* Neon intrinsics testsuite:
- looking at FP16 support.
* Turnoff 64bits ops in Neon:
- backport in 4.8 done by Matt during the release merges.
* Arndale: a few attempts to use it, but it's still unstable.
* Internal support
== Next ==
* Disable-peeling: Analyze bench results when available.
* Revert-coalesce-vars: Analyze bench results when available.
* Libsanitizer: contine isatty(2) study wrt qemu/expect.
* Neon intrinsics: check internally for other codecs
[short week, two days]
Progress:
* qemu maintenance
** arm-devs pull request (and associated code review, etc)
* VIRT-4 [Guest migration support for KVM]
** VIRT-49: implement cp15 sync with kernel
*** some forward motion, but partway through realised some work
I thought had been committed last year hadn't been, so:
** VIRT-73
*** new work item, covering updating the migration state for the
CPU itself to use VMState structures, by updating, testing
and tweaking some patches from Juan Quintela from last year
*** have done the 'update' part; tests and tweaks still todo
-- PMM
Summary:
* Investigate conditional compare.
Details:
1. Expand conditional compare as TRUTH_AND_EXPR/TRUTH_IOR_EXPR for tests.
2. Test tree-level changes for conditional compare.
* Fix/workaround most ICE issues in regression tests.
* Still some fails which expected VRP can optimize the cases.
3. Try to build Coremark and find that conditional compare does block
optimizations, which leads to worse performance.
Plan:
* Investigate VRP and other optimizations to handle conditional compare.
* Raise the propose for upstream discussion.
Planned leaves:
* April 4-8: Chinese Ching Ming Festival and annual leaves.
* April 12: Internal team event.
* April 16-17: Internal training.
Best Regards!
-Zhenqiang
== Progress ==
Started investigating gdb test cases that are failing on
arm-remote gdbserver configuration.
Completed investigation on all timeout gdb test cases failures in
arm-remote gdbserver configuration.
Setup a ubuntu test machine for gdb testing on x86_64 in
remote gdbserver configuration.
Initiated visa process for Ireland and sent requests for required documents
to Arwen.
*** No blue-print available to log work in JIRA.
== Plan ==
Complete investigation of all failure gdb test cases on arm-remote
gdbserver configuration.
Run gdb test suite in x86_64 remote gdbserver configuration and compare
with all other configurations already tested including arm remote to figure
out any similar failures while running test suite remotely on two different
machines.
Book travel to Ireland and complete visa process.
