== GCC ==
Progress:
* Investigated excessive VFP moves . Partially investigating ways forward.
* Polished up my divmodsi4 patch. Discussed it during the call.
Looking for ways to do it properly at the tree level.
* Got Panda board on Friday.
* Off on Wednesday.
* Conversations with Revital and Chung-Lin. Need to sync up with
Andrew next week.
* Found an issue with binutils and Neon and this is now LP:747837
Plans:
* Continue looking at excessive VFP moves.
* Finish working through Thumb2 speed tickets.
* Set up new Panda board.
* Conversation with Andrew sometime this week.
Meetings:
* 1-1s
* Linaro toolchain meeting
Absences:
* April 15 – 26 -> Booked Holiday.
* May 9-14 - LDS Budapest
== GDB ==
* Committed patch to fix single-stepping across bad ARM/Thumb boundary
(bug #667309) to mainline and Linaro GDB.
* Committed patch to fix accessing "fpscr" register to mainline.
* Ongoing work to fix single-stepping over signal handlers (bug #615978).
Posted yet another updated patch to gdb-patches for comments.
* Implemented patch to support NEON registers in core files (bug #615972).
* Investigated failure to disable address space randomization
(bug #616001).
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
Dr. Ulrich Weigand | Phone: +49-7031/16-3727
STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E.
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk
Wittkopp
Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294
Hi,
== pandaboard ==
* noticed that hw perf events are not working on 2.6.38-1001-linaro-omap
* it seems that the omap kernel has not configured its PMU properly
* perf_event_open syscall returns ENODEV
* started discussion with agreen (#744458)
* noticed that natty puts its glibc into a multilib path
* prevents linaro gcc (and upstream) from being built
== libunwind ==
* created a generic and local variant of the extbl parser
* ran the test suite a few times using different unwind methods
* started to look into the test suite failures
* started to fix a couple of the failures on ARM
Regards
Ken
RAG:
Red:
Amber:
Green: the aircon has been fixed; blessed quiet again
Current Milestones:
| Planned | Estimate | Actual |
qemu-linaro 2011-04 | 2011-04-21 | 2011-04-21 | |
Historical Milestones:
finish qemu-cont-integration | 2011-01-25 | 2011-01-25 | handed off |
first qemu-linaro release | 2011-02-08 | 2011-02-08 | 2011-02-08 |
qemu-linaro 2011-03 | 2011-03-08 | 2011-03-08 | 2011-03-08 |
== maintain-beagle-models ==
* the board-ram-limits patchset has been expanded significantly to
address upstream suggestions; it now includes a lot of refactoring
of sun4m (sparc) board code to use the new generic max-ram
functionality instead of a sun4m-specific bit of code. Unfortunately
there is still some pushback upstream on the grounds that a simple
max-ram limit doesn't cater for complicated NUMA situations :-(
== merge-correctness-fixes ==
* working on moving implementation of VLD/VST "multiple structures" forms
into qemu helper functions; the current implementation is correct but
can expand to hundreds of TCG ops which is well beyond the maximum
permitted value, so could potentially overrun a TCG buffer
== other ==
* wrote up some technical/engineering input into what we ought to be
doing with qemu next cycle
* review of a patch by Dmitry Eremin-Solenikov adding ARMv4/v4T support
* some review of s390 TCG patches (not because we have a direct interest
in s390 but as part of being a good citizen upstream)
* sent a pull request for some neon patches that had been on the list
a few weeks; hopefully this will help drain the patch pipeline
* meetings: toolchain, standup, pdsw-tools
Current qemu patch status is tracked here:
https://wiki.linaro.org/PeterMaydell/QemuPatchStatus
Absences:
Holiday: 22 Apr - 2 May
9-13 May: UDS, Budapest
(maybe) ~17-19 August: QEMU/KVM strand at LinuxCon NA, Vancouver
Hello,
* Submitted merge requests for SMS patch to gcc-linaro and gcc-linaro/4.6.
* Testing SMS patch which extends the current implementation to
consider loops that contain
instructions with REG_INC_NOTE.
* Filed PRs 48336 48380 for recent fails of trunk on ARM.
* Had a chat with Ramana about the DENbench benchmarks, directions and findings.
* Filed PR 745743 in linaro gcc-bugzilla
Thanks,
Revital
Hi,
* continued bringing patches upstream
- auto-detection of vector size - committed
- changing default vector size to 128 - submitted and testing the
final version
- if-conversion improvement - submitted and now testing the final version
* gcc-linaro-4.6
- submitted a merge request for store sink patch (this patch is
already upstream)
Ira
For reference. We know that the NEON intrinsics in GCC have issues.
I came across this page:
http://hilbert-space.de/?p=22
which has a colour to greyscale conversion done using intrinsics.
gcc-linaro-4.5-2011.03-0 does poorly through saving intermediate
values on the stack. The core of the loop is:
.L3:
mov ip, r4
vld3.8 {d16-d18}, [r6]
vstmia r4, {d16-d18}
ldmia ip!, {r0, r1, r2, r3}
mov sl, r9
adds r7, r7, #1
adds r6, r6, #24
stmia sl!, {r0, r1, r2, r3}
fldd d16, [sp, #24]
fldd d18, [sp, #32]
ldmia ip, {r0, r1}
vmull.u8 q8, d16, d19
stmia sl, {r0, r1}
vmlal.u8 q8, d18, d20
fldd d18, [sp, #40]
vmlal.u8 q8, d18, d21
vshrn.i16 d16, q8, #8
vst1.8 {d16}, [r5]
adds r5, r5, #8
cmp r8, r7
bgt .L3
llvm-2.9~svn128540 does much better:
vld3.8 {d20, d21, d22}, [r1]!
add r3, r3, #1
cmp r3, r2
vmull.u8 q12, d21, d16
vmlal.u8 q12, d20, d17
vmlal.u8 q12, d22, d18
vshrn.i16 d19, q12, #8
vst1.8 {d19}, [r0]!
blt .LBB0_1
and may actually be better than the had-written assembler on Nils's
page due to scheduling the loop comparison earlier.
Richard S, were you looking into this?
-- Michael
Hi there. A reminder that today's call has shifted due to the
European daylight savings change. It's now at 0800 UTC which is 9 am
in the UK, 10 am in central Europe, and 10 am in Israel.
-- Michael
