llvm dev - Oct 2012 - [LLVMdev] Using llvm-mc assembler in the llvm test-suite

Has anyone converted llvm/projects/test-suite to use the llvm assembler instead
of gcc?

If so, what was needed to change and how?

My assumption is that this would be a good way to test the llvm assembler.

Jack
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On Mon, Oct 15, 2012 at 2:22 PM, Carter, Jack <jcarter at mips.com>
wrote:
> Has anyone converted llvm/projects/test-suite to use the llvm assembler
> instead of gcc?
>
> If so, what was needed to change and how?
>
> My assumption is that this would be a good way to test the llvm assembler.
>
Not quite sure what you mean, as far as I know there isn't any
assembler in there
so if it's using clang it should be dependent upon the use of -integrated-as
for
your target?

I miss something?

-eric

Yes, absolutely. There's two pieces of this that are handy. First, checking
the normal integrated-assembler code path. That doesn't check the actual
assembler, but rather the binary encoder and object file emitter. To test that,
I did runs with a locally modified clang that enabled the integrated assembler
by default for my target (ARM/Darwin at the time). The second piece is checking
the assembler itself. For that, I ran the full test suite and kept the .s files
around. Then I ran each .s file through plain 'as' and llvm-mc and did a
binary comparison of the results. Anything that showed up, I analyzed to see if
it was innocuous or an error.

-Jim

On Oct 15, 2012, at 2:22 PM, "Carter, Jack" <jcarter at
mips.com> wrote:
> Has anyone converted llvm/projects/test-suite to use the llvm assembler
instead of gcc?
> If so, what was needed to change and how?
> 
> My assumption is that this would be a good way to test the llvm assembler.
> 
> Jack
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Let me see if I understand the response ;-)

When you are saying integrated assembler do you mean llc --filetype=obj? If so,
we currently have that for an option when running the test-suite.

When you say that to test the llvm-mc assembler for your target you don't
substitute the gcc assembler invocation for llvm-mc which would expect the
resultant executable run to pass. Instead you have to do another pass running
llvm-mc on the preserved .s files

Did I get this right?

If so, I am way too lazy and greedy. I want to run the suite and with an option,
substitute the llvm standalone assembler for the gcc one (not for the control
compile of course).

Jack

________________________________
From: Jim Grosbach [grosbach at apple.com]
Sent: Monday, October 15, 2012 2:40 PM
To: Carter, Jack
Cc: List
Subject: Re: [LLVMdev] Using llvm-mc assembler in the llvm test-suite

Yes, absolutely. There's two pieces of this that are handy. First, checking
the normal integrated-assembler code path. That doesn't check the actual
assembler, but rather the binary encoder and object file emitter. To test that,
I did runs with a locally modified clang that enabled the integrated assembler
by default for my target (ARM/Darwin at the time). The second piece is checking
the assembler itself. For that, I ran the full test suite and kept the .s files
around. Then I ran each .s file through plain 'as' and llvm-mc and did a
binary comparison of the results. Anything that showed up, I analyzed to see if
it was innocuous or an error.

-Jim

On Oct 15, 2012, at 2:22 PM, "Carter, Jack" <jcarter at
mips.com<mailto:jcarter at mips.com>> wrote:

Has anyone converted llvm/projects/test-suite to use the llvm assembler instead
of gcc?

If so, what was needed to change and how?

My assumption is that this would be a good way to test the llvm assembler.

Jack
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu<mailto:LLVMdev at cs.uiuc.edu>        
http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

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Eric,

This invocation creates the .s file using llc:
build/Debug+Asserts/bin/llc -march=mipsel -mcpu=mips32r2 -mattr=o32  
-disable-mips-delay-filler -filetype=asm -relocation-model=pic 
-asm-verbose=false -O3  Output/mandel-2.llvm.mipsel.ll -o
Output/mandel-2.llc.mips32r2.s
-info-output-file=/home/jcarter/workarea/assembler_jack/build/projects/test-suite/SingleSource/Benchmarks/Misc/Output/mandel-2.llc.mips32r2.s.info
-stats -time-passes

The next line assembles it with gcc. The gcc driver will invoke gas on it. This
is the part that I want to use llvm-mc.
mips-linux-gnu-g++ Output/mandel-2.llc.mips32r2.s -o
Output/mandel-2.llc.mips32r2 -mips32r2 -EL -lm -lstdc++ -lpthread -fPIC -mabi=32

________________________________________
From: Eric Christopher [echristo at gmail.com]
Sent: Monday, October 15, 2012 2:36 PM
To: Carter, Jack
Cc: List
Subject: Re: [LLVMdev] Using llvm-mc assembler in the llvm test-suite

On Mon, Oct 15, 2012 at 2:22 PM, Carter, Jack <jcarter at mips.com>
wrote:
> Has anyone converted llvm/projects/test-suite to use the llvm assembler
> instead of gcc?
>
> If so, what was needed to change and how?
>
> My assumption is that this would be a good way to test the llvm assembler.
>
Not quite sure what you mean, as far as I know there isn't any
assembler in there
so if it's using clang it should be dependent upon the use of -integrated-as
for
your target?

I miss something?

-eric