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Author SHA1 Message Date
Matt Arsenault 4474652c95 Revert "StructurizeCFG: Directly invert cmp instructions" 
This reverts commit r300732. This breaks a few tests.
I think the problem is related to adding more uses of
the condition that don't yet exist at this point.

llvm-svn: 301242
 2017-04-24 20:25:01 +00:00
Matt Arsenault d3406bc45c StructurizeCFG: Directly invert cmp instructions 
The most common case for a branch condition is
a single use compare. Directly invert the branch
predicate rather than adding a lot of xor i1 true
which the DAG will have to fold later.

This produces nicer to read structurizer output.

This produces some random changes in codegen
due to the DAG swapping branch conditions itself,
and then does a poor job of dealing with those
inverts.

llvm-svn: 300732
 2017-04-19 18:29:07 +00:00
Matt Arsenault 0607a4427b AMDGPU: Fix annotating loops with nested loop conditions 
If the branch condition for a loop was a phi which itself
was fed from a phi from a loop, it isn't safe to try
to delete the phi until after the loop is handled.

llvm-svn: 298737
 2017-03-24 20:57:10 +00:00