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

[Jim Grosbach]

On Oct 15, 2012, at 3:00 PM, "Carter, Jack" <jcarter at mips.com> wrote:

> 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.

That's the equivalent, yes. Sounds like you have that covered.

> 
> 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?
> 

Yes, however...

> 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).
> 

Doing it by assembling the .s files and comparing those allowed me to do the vast majority of the assembler testing without ever running the test suite on a target device (which takes a long time), or re-compiling the test-suite (which also takes a fair bit of time), thus speeding up my turnaround time.

There aren't, that I know of, makefile rules to do things the way you're asking. It could be added, of course.

-Jim


> 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> 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
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