search for: 32561

...'s a summary of issues that were deferred for later on (some of which are optimization-ish and we might decide to never do at -O0 at all): * Crash in RegBankSelect for half fp types: https://bugs.llvm.org/show_bug.cgi?id=32560 * Improving constant placement: http://bugs.llvm.org/show_bug.cgi?id=32561 * Fancy switch lowering * Transforming division-by-constant-power-of-2 into right shift AFAICT all the other issues that were brought up were fixed (yay!). Cheers, Diana On 11 May 2017 at 08:44, Kristof Beyls via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > On 10 May 2017, at 17...

...>> Same issue causes SingleSource/Benchmarks/Shootout-C++/Shootout-C++-moments (58.5%) >> MultiSource/Applications/siod/siod (72%): Seems to be mainly due to loading constants in the entry BB, but I'm not sure that indeed is the biggest cause. (https://bugs.llvm.org//show_bug.cgi?id=32561 <https://bugs.llvm.org//show_bug.cgi?id=32561>) >> MultiSource/Benchmarks/MiBench/consumer-typeset/consumer-typeset (48%): Due to creating all constants in the entry BB, see function CopyObject. (https://bugs.llvm.org//show_bug.cgi?id=32561 <https://bugs.llvm.org//show_bug.cgi?id=325...

...SingleSource/Benchmarks/Shootout-C++/Shootout-C++-moments (58.5%) > - MultiSource/Applications/siod/siod (72%): Seems to be mainly due > to loading constants in the entry BB, but I'm not sure that indeed is the > biggest cause. (https://bugs.llvm.org//show_bug.cgi?id=32561) > - MultiSource/Benchmarks/MiBench/consumer-typeset/consumer-typeset > (48%): Due to creating all constants in the entry BB, see function > CopyObject. (https://bugs.llvm.org//show_bug.cgi?id=32561) > - MultiSource/Benchmarks/mediabench/mpeg2/mpeg2dec/mpeg2decod...

..._move(). Same issue causes SingleSource/Benchmarks/Shootout-C++/Shootout-C++-moments (58.5%) * MultiSource/Applications/siod/siod (72%): Seems to be mainly due to loading constants in the entry BB, but I'm not sure that indeed is the biggest cause. (https://bugs.llvm.org//show_bug.cgi?id=32561) * MultiSource/Benchmarks/MiBench/consumer-typeset/consumer-typeset (48%): Due to creating all constants in the entry BB, see function CopyObject. (https://bugs.llvm.org//show_bug.cgi?id=32561) * MultiSource/Benchmarks/mediabench/mpeg2/mpeg2dec/mpeg2decode (46%): Function Reference_ID...

...'ll try to summarize things on the mailing list as well: We still have a few bugs open that we should fix or at least discuss before turning GlobalISel on by default at O0 for AArch64: * PR32560 - A crash in regbank select [2] * PR32550 - Floating point values moving a lot through GPRs [3] * PR32561 - Improve placement of constants [4] * Optional - improve handling of switch statements (I think we don't even have a bug open for this, but it has been brought up) Unrelated to O0, here are some pending patches (at least that I'm aware of): * Legalization of non-power-of-2 types [5] - thi...

...(some of which are optimization-ish and we might decide to > never do at -O0 at all): > * Crash in RegBankSelect for half fp types: > https://bugs.llvm.org/show_bug.cgi?id=32560 > > > I’ll have a look. > > * Improving constant placement: http://bugs.llvm.org/show_bug.cgi?id=32561 > > > I’ve commented in the PR to mention the localizer technic I was playing > with, if someone wants to give it a try. > > * Fancy switch lowering > * Transforming division-by-constant-power-of-2 into right shift > > > AFAICT all the other issues that were brought up...

Hi all, At the EuroLLVM BoF people asked where the design discussions around GlobalISel take place. Naturally, a lot of them take place at Apple, since they have the highest density of co-located GlobalISel devs, but we also have some in Phab. For those of you that are interested, please have a look at the following topics - discussions are progressing rather slowly and we definitely

...half fp types: >>> >> https://bugs.llvm.org/show_bug.cgi?id=32560 >>> >> >>> >> >>> >> I’ll have a look. >>> >> >>> >> * Improving constant placement: >>> >> http://bugs.llvm.org/show_bug.cgi?id=32561 >>> >> >>> >> >>> >> I’ve commented in the PR to mention the localizer technic I was playing >>> >> with, if someone wants to give it a try. >>> >> >>> >> * Fancy switch lowering >>> >> * Transf...

...er do at -O0 at all): > >> * Crash in RegBankSelect for half fp types: > >> https://bugs.llvm.org/show_bug.cgi?id=32560 > >> > >> > >> I’ll have a look. > >> > >> * Improving constant placement: > http://bugs.llvm.org/show_bug.cgi?id=32561 > >> > >> > >> I’ve commented in the PR to mention the localizer technic I was playing > >> with, if someone wants to give it a try. > >> > >> * Fancy switch lowering > >> * Transforming division-by-constant-power-of-2 into right shift...

...e of which are optimization-ish and we might decide to > never do at -O0 at all): > * Crash in RegBankSelect for half fp types: > https://bugs.llvm.org/show_bug.cgi?id=32560 > > > I’ll have a look. > > * Improving constant placement: > http://bugs.llvm.org/show_bug.cgi?id=32561 > > > I’ve commented in the PR to mention the localizer technic I was playing > with, if someone wants to give it a try. > > * Fancy switch lowering > * Transforming division-by-constant-power-of-2 into right shift > > > AFAICT all the other issues that were brought up...

...r do at -O0 at all): >>> * Crash in RegBankSelect for half fp types: >>> https://bugs.llvm.org/show_bug.cgi?id=32560 >>> >>> >>> I’ll have a look. >>> >>> * Improving constant placement: >>> http://bugs.llvm.org/show_bug.cgi?id=32561 >>> >>> >>> I’ve commented in the PR to mention the localizer technic I was playing >>> with, if someone wants to give it a try. >>> >>> * Fancy switch lowering >>> * Transforming division-by-constant-power-of-2 into right shift >&gt...

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...e of which are optimization-ish and we might decide to > never do at -O0 at all): > * Crash in RegBankSelect for half fp types: > https://bugs.llvm.org/show_bug.cgi?id=32560 > > > I’ll have a look. > > * Improving constant placement: > http://bugs.llvm.org/show_bug.cgi?id=32561 > > > I’ve commented in the PR to mention the localizer technic I was playing > with, if someone wants to give it a try. > > * Fancy switch lowering > * Transforming division-by-constant-power-of-2 into right shift > > > AFAICT all the other issues that were brought up...

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...for enabling optimizations I’ve filed a few PRs that people can follow or comment on to track the progress towards enabling the -Os optimization level. The rough outline is: PR 38365 - [AArch64][GlobalISel] Never fall back on CTMark or benchmarks (Darwin) PR 38366 - GlobalISel: Lightweight CSE PR 32561 - GlobalISel: placement of constants in the entry-block and fast regalloc result in lots of reloaded constant PR 38367 - GlobalISel: Implement support for obtaining known bits information PR 38368 - GlobalISel: Investigate an efficient way to ensure load/store orderings These, along with general d...

...people can follow or comment on to track the >> progress towards enabling the -Os optimization level. The rough outline is: >> >> PR 38365 - [AArch64][GlobalISel] Never fall back on CTMark or benchmarks >> (Darwin) >> PR 38366 - GlobalISel: Lightweight CSE >> PR 32561 - GlobalISel: placement of constants in the entry-block and fast >> regalloc result in lots of reloaded constant >> PR 38367 - GlobalISel: Implement support for obtaining known bits >> information >> PR 38368 - GlobalISel: Investigate an efficient way to ensure load/store &g...

Hi Kristof, > On Apr 27, 2017, at 9:47 AM, Kristof Beyls <kristof.beyls at arm.com> wrote: > > Hi Quentin, > >> On 27 Apr 2017, at 00:48, Quentin Colombet <qcolombet at apple.com <mailto:qcolombet at apple.com>> wrote: >> >> Hi Kristof, >> >>> On Apr 6, 2017, at 6:53 AM, Kristof Beyls <kristof.beyls at arm.com

...people can follow or comment on to track the >> progress towards enabling the -Os optimization level. The rough outline is: >> >> PR 38365 - [AArch64][GlobalISel] Never fall back on CTMark or benchmarks >> (Darwin) >> PR 38366 - GlobalISel: Lightweight CSE >> PR 32561 - GlobalISel: placement of constants in the entry-block and fast >> regalloc result in lots of reloaded constant >> PR 38367 - GlobalISel: Implement support for obtaining known bits >> information >> PR 38368 - GlobalISel: Investigate an efficient way to ensure load/store &g...