Hello,
I'm using Linaro GCC 4.9-2015.01-3 for AArch64, and trying to disable the
generation of guarded instructions. More specifically, I'd like not to see
instructions such as 'cset', 'csinc', 'ccmp', 'fccmp', etc.
So far, it seemed that the flag '-fno-if-conversion2' could do the job, but
I still see those instructions in my disassembled program functions (I
guess that it may not be possible to remove them from standard libs).
My command line:
aarch64-linux-gnu-gcc -static -march=armv8-a -O3 -fno-strict-aliasing
-fno-if-conversion2
I also tried '-fno-if-conversion' and both '-fno-if-conversion
-fno-if-conversion2' without success.
Regards,
--
Fernando A. Endo, Post-doc
INRIA Rennes-Bretagne Atlantique
France
o Travel from Cauldron (2/10)
o One day off (2/10)
== Progress ==
o Linaro GCC/Validation (7/10)
- Started backports for 2016.10
- Investigating 4.9.4 branch marge validation issues
- Extended validation monitoring, tried to reproduce an OOM issue.
o Misc (3/10)
* Various meetings and discussions.
* Connect preparation
== Plan ==
o Tuesday off
o Continue on-going tasks and travel to LAS16
== Progress ==
* Validation
- patch reviews (Jenkins jobs, abe)
* GCC
- reported a few regressions on trunk
- looked at making reporting scripts more robust
at handling DejaGnu errors that could otherwise
be un-noticed
* Binutils
- backported a fix from trunk to linaro-2.27 branch, to close bug
2518 (linker SEGV)
- investigating https://sourceware.org/bugzilla/show_bug.cgi?id=20608
"Relocation truncated to fit: R_ARM_THM_JUMP24 for relocation to PLT entry"
* misc (conf-calls, meetings, emails, ....)
- Connect preparation
== Next ==
- monitor GCC trunk regressions
- release scripts/abe
- backports/reviews
- Binutils bug 20608
== Progress ==
* Validation
- patch reviews (Jenkins jobs, abe)
- helped on release infra/scripts
* GNU Cauldron
- useful discussion with several maintainers
* GCC
- progress on PR 67591 (ARM v8 Thumb IT blocks deprecated)
First patch posted, I will need benchmark results.
* misc (conf-calls, meetings, emails, ....)
== Progress ==
- Connect slides
- Return jump function - working on prototype
- Revised and posted early-vrp
- Revised and posted patch for PR72835
== Next ==
- Work on IPA/LTO improvements
- Wrap-up connect slides
- Follow up on pending patches
== This Week ==
* TCWG-807 (4/10)
- Wrote patch for extending ipa-bits-cp with pointer alignment propagation,
* TCWG-779 (2/10)
- Removed obstack for fmt building and added %I to pp_format for
printing vec<int>
- Posted patch upstream for feedback
* TCWG-319 (1/10)
- Tried random hacks to lib/target-supports.exp, none of which worked :(
* TCWG-72 (1/10)
- Upstream discussion about optab_libfunc() issue with
Richard Sandiford and Richi
* Misc (2/10)
- Travel from Cauldron
- Meetings
- Lava job #1118698 failed with infrastructure error: "Unable to download",
restarted as #1123350
== Next Week ==
- Prepare slides for connect
- Continue ongoing tasks
== Progress ==
* [AArch64] Support for label arithmetic in the assembler [TCWG-710]
- 2 patches in upstream review
* Handle special cases in AArch64InstrInfo::GetInstSizeInBytes [TCWG-757]
- Committed a patch for stackmap / patchpoint sizes
- Since this was a bit cumbersome to test otherwise, I had to add
unit tests for it, which took a bit of CMake plumbing because these
are the first target-specific unit tests in LLVM
* Add worktree module to tcwg-release-tools [TCWG-783]
- Started working on it
* Misc
- Helped test/setup the new TK1 buildbots
== Plan ==
* Add worktree module to tcwg-release-tools [TCWG-783]
* Help get the TK1 buildbots into a stable state
* Ping upstream patches
* Off on Mon and Tue. [4/20]
# Progress #
* Range stepping in ARM. TCWG-518 [5/20]
The thread starvation is fixed by randomly
selecting pending events among threads. Being regression tested.
* GDB 7.12 release. TCWG-685. [4/20]
Due to the recent kernel change, single step in GDBserver stops
working, because new kernel becomes sensitive on writing RES0
bits in CPSR. Fixed in GDB side.
* GNU Cauldron. [7/20]
Discussed with GDB people on the projects we are
working on. Got some agreement on the general direction of some
projects. Discussed with the possible GDB changes to handle
variable length registers, such as SVE. Agreed to move ptrace-test
from sourceware to kernel tree. Sync on 7.12 release. Discussed on
AArch64 TLS var debug information, looks it is less complex than
expected.
# Plan #
* Off on Mon and Tue.
* TCWG-685, TCWG-518
* Prepare for the US travel.
--
Yao Qi
== Activity ==
Exceptions support in LLD; 3rd try at an implementation that will be
accepted upstream. Now implementation complete and passing my existing
tests but needs some more cases checked.
Helped track down an intermittent build bot failure to an ld stub
generation problem
Some upstream patch review
== Next Week ==
Add more test cases and send exceptions support upstream
Use some of the Cauldron slides to replace existing LLD ones in the
Connect presentation.
== Planned Absences ==
Holiday 10th - 14th October
