[LLVMdev] Testing backend

[Chris Lattner]

On Wed, 9 Jun 2004, John Criswell wrote:
> If you want simple C programs to compile and test with your code
> generator, I'd recommend the tests in llvm/test/Programs/SingleSource.
> The tests in llvm/test/Programs are all complete programs that can be
> compiled and executed.  You can use them to compare your code generator
> results with that of the native compiler.

As John mentioned, the test/Programs/SingleSource directory is the place
to start.  I would recommend looking at .../Regressions/C  .../UnitTests
and .../Benchmarks/Shootout.  When stuff is basically sorta working, you
can move up to the "big" ones like Benchmarks/Dhyrstone :)

Also, one of the really nice things of the test/Programs hierarchy is that
it has a lot of debugging functionality built in.  In particular, if a
program (say test/Programs/SingleSource/UnitTests/2003-05-31-CastToBool.c)
crashes or miscompiles with your code generator, you can go into that
directory and say:

  make Output/2003-05-31-CastToBool.bugpoint-llc

... and bugpoint will autoreduce the testcase down to something that is
hopefully trivially small for you to work with.

-Chris

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