[cxx-mem-model] __sync_mem builtin support patch 3/3 - testcases

[Andrew MacLeod <amacleod at redhat dot com>]

This is a set of tests to verify the basic functionality of the new 
__sync_mem builtin functions.

I've removed the older tests I created for __sync_mem_exchange and 
replaced them with tests following a different format.

sync-mem-invalid.c tests for an error for each invalid memory model 
combination.

There is a different test file for each __sync_mem builtin function.  
They each test the basic functionality with each valid memory model. 
Note they don't test the effeciveness any fences required by the memory 
model, that is beyond the scope of these tests. It does test that 
expected results are returned.

Any of the builtins which work on more than one size have test names 
ending in -{1-5}, representing a different size object it can represent: 
1, 2, 4, 8, or 16 byte values. Each of these are identical except for 
the data size. I elected to have these all separate since different 
architectures have different levels of support for each these sizes, and 
this will make it easier to either XFAIL a size that is known not to 
work, or detect one which is not working but should be...

sync-mem-compare-exchange-[1-5].c all fail currently, which is expected 
since compare_exchange is going to finshed later as noted in the patch 
with the code.  The tests will likely change a bit as well to take into 
account the weak/strong variations that have not been added yet either. 
Probalby just one or two of them will be converted to the weak version.

The rest of these tests all pass with the code patch on 
x86_64-unknown-linux-gnu. OK for the branch?

Andrew

Attachment: test.patch
Description: Text document