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Craig Topper via llvm-dev

2019-Mar-23 21:06 UTC

[llvm-dev] Generating object files more efficiently

-march for clang and -march for llc do different things unfortunately.
-march for clang at least on x86 is the same as -mcpu in llc. Which is an
artifact of gcc compatibility.

~Craig


On Sat, Mar 23, 2019 at 1:40 PM Doerfert, Johannes via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Oh, my bad.
>
>
> Idk why llc seems to know that architecture but clang does not.
>
> Doesn't make sense to me, sorry.
> ------------------------------
> *From:* J S <mm92126 at hotmail.com>
> *Sent:* Saturday, March 23, 2019 3:32:03 PM
> *To:* Doerfert, Johannes
> *Cc:* via llvm-dev
> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>
> It is my actual target architecture
> ------------------------------
> *From:* Doerfert, Johannes <jdoerfert at anl.gov>
> *Sent:* Saturday, March 23, 2019 1:30 PM
> *To:* J S
> *Cc:* via llvm-dev
> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>
>
> I copied "-march=XYZ" from your original email,
>
> you have to replace it with your actual target architecture or simply drop
> it.
> ------------------------------
> *From:* J S <mm92126 at hotmail.com>
> *Sent:* Saturday, March 23, 2019 3:26:59 PM
> *To:* Doerfert, Johannes
> *Cc:* via llvm-dev
> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>
>
>
> Johannes,
>
>
> I tried the last one and it gave me this:
>
>
> error: unknown target CPU 'XYZ'
> note: valid target CPU values are: nocona, core2, penryn, bonnell, atom,
>       silvermont, slm, goldmont, goldmont-plus, tremont, nehalem, corei7,
>       westmere, sandybridge, corei7-avx, ivybridge, core-avx-i, haswell,
>       core-avx2, broadwell, skylake, skylake-avx512, skx, cascadelake,
>       cannonlake, icelake-client, icelake-server, knl, knm, k8, athlon64,
>       athlon-fx, opteron, k8-sse3, athlon64-sse3, opteron-sse3, amdfam10,
>       barcelona, btver1, btver2, bdver1, bdver2, bdver3, bdver4, znver1,
> znver2,
>       x86-64
>
>
> ------------------------------
> *From:* Doerfert, Johannes <jdoerfert at anl.gov>
> *Sent:* Saturday, March 23, 2019 1:15 PM
> *To:* J S
> *Cc:* via llvm-dev
> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>
> I would have guessed:
>
> object:
> clang -c foo.c -o foo.o -march=XYZ
>
> shared library:
> clang -shared foo.c -o foo.so -march=XYZ
>
> executable:
> clang foo.c -o foo -march=XYZ
>
>
> On 03/23, J S via llvm-dev wrote:
> > Currently I compile my C code in 2 steps in order to generate .o files
> >
> > clang -emit-llvm -c foo.c -o foo.bc
> > llc -march=XYZ foo.bc -filetype=obj
> >
> > Is there a way to generate either .o or .elf files in just 1 command?
> >
> > Thanks.
> >
>
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> llvm-dev Info Page
> <https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
> lists.llvm.org
> To see the collection of prior postings to the list, visit the llvm-dev
> Archives.. Using llvm-dev: To post a message to all the list members, send
> email to llvm-dev at lists.llvm.org. You can subscribe to the list, or
> change your existing subscription, in the sections below.
>
>
>
> --
>
> Johannes Doerfert
> Researcher
>
> Argonne National Laboratory
> Lemont, IL 60439, USA
>
> jdoerfert at anl.gov
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Craig Topper via llvm-dev

2019-Mar-23 21:10 UTC

head link

[llvm-dev] Generating object files more efficiently

In order for clang to support a new target you need to add support in
lib/Basic/Targets.cpp in the AllocateTarget function and add new files to
the lib/Basic/Targets/ directory.

~Craig


On Sat, Mar 23, 2019 at 2:06 PM Craig Topper <craig.topper at gmail.com>
wrote:
> -march for clang and -march for llc do different things unfortunately.
> -march for clang at least on x86 is the same as -mcpu in llc. Which is an
> artifact of gcc compatibility.
>
> ~Craig
>
>
> On Sat, Mar 23, 2019 at 1:40 PM Doerfert, Johannes via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Oh, my bad.
>>
>>
>> Idk why llc seems to know that architecture but clang does not.
>>
>> Doesn't make sense to me, sorry.
>> ------------------------------
>> *From:* J S <mm92126 at hotmail.com>
>> *Sent:* Saturday, March 23, 2019 3:32:03 PM
>> *To:* Doerfert, Johannes
>> *Cc:* via llvm-dev
>> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>>
>> It is my actual target architecture
>> ------------------------------
>> *From:* Doerfert, Johannes <jdoerfert at anl.gov>
>> *Sent:* Saturday, March 23, 2019 1:30 PM
>> *To:* J S
>> *Cc:* via llvm-dev
>> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>>
>>
>> I copied "-march=XYZ" from your original email,
>>
>> you have to replace it with your actual target architecture or simply
>> drop it.
>> ------------------------------
>> *From:* J S <mm92126 at hotmail.com>
>> *Sent:* Saturday, March 23, 2019 3:26:59 PM
>> *To:* Doerfert, Johannes
>> *Cc:* via llvm-dev
>> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>>
>>
>>
>> Johannes,
>>
>>
>> I tried the last one and it gave me this:
>>
>>
>> error: unknown target CPU 'XYZ'
>> note: valid target CPU values are: nocona, core2, penryn, bonnell,
atom,
>>       silvermont, slm, goldmont, goldmont-plus, tremont, nehalem,
corei7,
>>       westmere, sandybridge, corei7-avx, ivybridge, core-avx-i,
haswell,
>>       core-avx2, broadwell, skylake, skylake-avx512, skx, cascadelake,
>>       cannonlake, icelake-client, icelake-server, knl, knm, k8,
athlon64,
>>       athlon-fx, opteron, k8-sse3, athlon64-sse3, opteron-sse3,
amdfam10,
>>       barcelona, btver1, btver2, bdver1, bdver2, bdver3, bdver4,
znver1,
>> znver2,
>>       x86-64
>>
>>
>> ------------------------------
>> *From:* Doerfert, Johannes <jdoerfert at anl.gov>
>> *Sent:* Saturday, March 23, 2019 1:15 PM
>> *To:* J S
>> *Cc:* via llvm-dev
>> *Subject:* Re: [llvm-dev] Generating object files more efficiently
>>
>> I would have guessed:
>>
>> object:
>> clang -c foo.c -o foo.o -march=XYZ
>>
>> shared library:
>> clang -shared foo.c -o foo.so -march=XYZ
>>
>> executable:
>> clang foo.c -o foo -march=XYZ
>>
>>
>> On 03/23, J S via llvm-dev wrote:
>> > Currently I compile my C code in 2 steps in order to generate .o
files
>> >
>> > clang -emit-llvm -c foo.c -o foo.bc
>> > llc -march=XYZ foo.bc -filetype=obj
>> >
>> > Is there a way to generate either .o or .elf files in just 1
command?
>> >
>> > Thanks.
>> >
>>
>> > _______________________________________________
>> > LLVM Developers mailing list
>> > llvm-dev at lists.llvm.org
>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> llvm-dev Info Page
>> <https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
>> lists.llvm.org
>> To see the collection of prior postings to the list, visit the llvm-dev
>> Archives.. Using llvm-dev: To post a message to all the list members,
send
>> email to llvm-dev at lists.llvm.org. You can subscribe to the list, or
>> change your existing subscription, in the sections below.
>>
>>
>>
>> --
>>
>> Johannes Doerfert
>> Researcher
>>
>> Argonne National Laboratory
>> Lemont, IL 60439, USA
>>
>> jdoerfert at anl.gov
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
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J S via llvm-dev

2019-Mar-23 22:18 UTC

head link

[llvm-dev] Generating object files more efficiently

Thanks, Craig,

FYI, I also had to update clang/lib/Basic/CMakeLists.txt
________________________________
From: Craig Topper <craig.topper at gmail.com>
Sent: Saturday, March 23, 2019 2:10 PM
To: Doerfert, Johannes
Cc: J S; via llvm-dev
Subject: Re: [llvm-dev] Generating object files more efficiently

In order for clang to support a new target you need to add support in
lib/Basic/Targets.cpp in the AllocateTarget function and add new files to the
lib/Basic/Targets/ directory.

~Craig


On Sat, Mar 23, 2019 at 2:06 PM Craig Topper <craig.topper at
gmail.com<mailto:craig.topper at gmail.com>> wrote:
-march for clang and -march for llc do different things unfortunately. -march
for clang at least on x86 is the same as -mcpu in llc. Which is an artifact of
gcc compatibility.

~Craig


On Sat, Mar 23, 2019 at 1:40 PM Doerfert, Johannes via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:

Oh, my bad.


Idk why llc seems to know that architecture but clang does not.

Doesn't make sense to me, sorry.

________________________________
From: J S <mm92126 at hotmail.com<mailto:mm92126 at hotmail.com>>
Sent: Saturday, March 23, 2019 3:32:03 PM
To: Doerfert, Johannes
Cc: via llvm-dev
Subject: Re: [llvm-dev] Generating object files more efficiently

It is my actual target architecture
________________________________
From: Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at
anl.gov>>
Sent: Saturday, March 23, 2019 1:30 PM
To: J S
Cc: via llvm-dev
Subject: Re: [llvm-dev] Generating object files more efficiently


I copied "-march=XYZ" from your original email,

you have to replace it with your actual target architecture or simply drop it.

________________________________
From: J S <mm92126 at hotmail.com<mailto:mm92126 at hotmail.com>>
Sent: Saturday, March 23, 2019 3:26:59 PM
To: Doerfert, Johannes
Cc: via llvm-dev
Subject: Re: [llvm-dev] Generating object files more efficiently



Johannes,


I tried the last one and it gave me this:


error: unknown target CPU 'XYZ'
note: valid target CPU values are: nocona, core2, penryn, bonnell, atom,
      silvermont, slm, goldmont, goldmont-plus, tremont, nehalem, corei7,
      westmere, sandybridge, corei7-avx, ivybridge, core-avx-i, haswell,
      core-avx2, broadwell, skylake, skylake-avx512, skx, cascadelake,
      cannonlake, icelake-client, icelake-server, knl, knm, k8, athlon64,
      athlon-fx, opteron, k8-sse3, athlon64-sse3, opteron-sse3, amdfam10,
      barcelona, btver1, btver2, bdver1, bdver2, bdver3, bdver4, znver1, znver2,
      x86-64


________________________________
From: Doerfert, Johannes <jdoerfert at anl.gov<mailto:jdoerfert at
anl.gov>>
Sent: Saturday, March 23, 2019 1:15 PM
To: J S
Cc: via llvm-dev
Subject: Re: [llvm-dev] Generating object files more efficiently

I would have guessed:

object:
clang -c foo.c -o foo.o -march=XYZ

shared library:
clang -shared foo.c -o foo.so -march=XYZ

executable:
clang foo.c -o foo -march=XYZ


On 03/23, J S via llvm-dev wrote:> Currently I compile my C code in 2 steps in order to generate .o files
>
> clang -emit-llvm -c foo.c -o foo.bc
> llc -march=XYZ foo.bc -filetype=obj
>
> Is there a way to generate either .o or .elf files in just 1 command?
>
> Thanks.
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-devllvm-dev Info
Page<https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
lists.llvm.org<http://lists.llvm.org>
To see the collection of prior postings to the list, visit the llvm-dev
Archives.. Using llvm-dev: To post a message to all the list members, send email
to llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>. You can
subscribe to the list, or change your existing subscription, in the sections
below.




--

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>
_______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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llvm dev - Mar 2019 - Generating object files more efficiently

[llvm-dev] Generating object files more efficiently

[llvm-dev] Generating object files more efficiently

[llvm-dev] Generating object files more efficiently