[LLVMdev] inline asm constraints examples/tests

Tue Sep 21 14:45:16 PDT 2010

Dale,

Sorry, I see you did say I should run the gcc tests.  I apologize for
forgetting this.  I'll work on getting them to run here.

Chris et. all,

I have a fix for the assertion failure in the enclosed llvmmultalt8.patch
file.  I didn't realize the input constraints could have different numbers
of alternatives from the outputs, which now makes sense.  The pr20314-2.c
file now compiles on my 64-bit Linux box.  However, it still has a problem
on 32-bit Windows and 32-bit Linux:

fatal error: error in backend: Ran out of registers during register
allocation!
Please check your inline asm statement for invalid constraints:
INLINEASM <es:>, 0, 10, %reg16396<def>, 10, %reg16397<def>, 10,
%reg16398<def>, 10, %reg16399<def>, 10, %reg16400<def>, 10,
%reg16401<def>,10, %reg16402<def>, 10, %reg16403<def>, 10, %reg16404<def>,
10, %reg16405<def>, 10, %reg16406<def>, 10, %reg16407<def>, 2147483657,
%EAX, 2147549193, %ECX, 2147614729, %EDX, 2147680265, %ESI, 2147745801,
%EDI, 2147811337, %EBX, 2147876873, %EBP, 2147942409, %reg16403, 2148007945,
%reg16404, 2148073481, %reg16405, 2148139017, %reg16406, 2148204553,
%reg16407, 14, %EFLAGS<earlyclobber,imp-def>, <<badref>>;
GR32:%reg16396,16397,16398,16399,16400,16401,16402,16403,16404,16405,16406,16407,16403,16404,16405,16406,16407
For the code:

int a, b, c, d, e, f, g, h, i, j, k, l;
void
f1 (void)
{
  __asm__ volatile (""
      : [a] "+r" (a), [b] "+r" (b), [c] "+r" (c), [d] "+r" (d),
        [e] "+r" (e), [f] "+r" (f), [g] "+r" (g), [h] "+r" (h),
        [i] "+r" (i), [j] "+r" (j), [k] "+r" (k), [l] "+r" (l));
}
This confused me since it doesn't use multiple-alternative constraints,
meaning it should fall back to the original logic.  I'm thinking this
problem probably isn't related to my code.  To try to confirm this, I built
an LLVM tree I had checked out on August 24 (rev 111968) and I see the same
error.

If you agree, I'll go ahead and check in my patches, and file a bug on the
above error.

The llvmmultalt8.patch and the clangmultalt8.patch files have a little extra
stuff I had just added previous to this, namely adding partial support for
the E, F, and p constraint characters I saw from the GCC docs, and which
should be benign.

Sorry for the hassle.

-John

On Tue, Sep 21, 2010 at 10:08 AM, Dale Johannesen <dalej at apple.com> wrote:

>
>  On Sep 20, 2010, at 9:40 PMPDT, John Thompson wrote:
>
>  Thanks, Stuart.  Sorry, I had some left-over editing cruft in my email.
> From Googling runtest, I had found dejagnu, which I'd heard some folks were
> using over there, so I used the local package manager to install it.  But
> from what you said I went ahead and got the dejagnu sources and built it,
> but had problems in running make install, which is trying to put it
> /usr/local/bin rather than /usr/bin like the package manager did, so I left
> it alone for now.  But the dejagnu tree is adjacent to the gcc test suite
> tree.  Should I try to resolve the install problems?  Running runtest
> --version:
>
> Expect version is 5.43.0
> Tcl version is 8.4
> Framework version is 1.4.99
>
> In my first run, only 95 tests passed, 516 unexpected failures, etc.  So
> either I still need some kind of configuration fix, or this particular snap
> of the tests doesn't work on my particular Linux box.  I'm using the triple
> i386-unknown-linux in Daniel's makefile.
>
>
> There should be far more than 600 tests run, more like 40000 for C alone.
>  You're doing something basic wrong.
>
> I did ask you to run this before checking in your patch.  Please don't
> skimp on testing in the future.
>
>  I'm running the tests again adding the -v option to runtest to see if
> that gives me any more information, plus using the Release+Asserts version
> of the clang binaries.
>
> But I'm hoping you or Daniel can straighten me out.
> Thanks again,
>
> -John
> On Mon, Sep 20, 2010 at 4:46 PM, Stuart Hastings <stuart at apple.com> wrote:
>
>>
>> On Sep 20, 2010, at 4:38 PM, John Thompson wrote:
>>
>> [snip]
>>
>> > I just tried running the gcc tests, but am missing "runtest".
>>
>>        http://www.gnu.org/software/dejagnu/
>>
>> Follow the directions there.  I think the GCC test suite wants DejaGNU to
>> be installed in a sibling directory, adjacent to the llvm-gcc or clang
>> toplevel.
>>
>> HTH,
>>
>> stuart
>
>
>
>
> --
> John Thompson
> John.Thompson.JTSoftware at gmail.com
>
> _______________________________________________
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> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>
>
>

-- 
John Thompson
John.Thompson.JTSoftware at gmail.com
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