Commit Graph

5 Commits

Author SHA1 Message Date
Matt Arsenault 9aa45f047f AMDGPU: Add macro fusion schedule DAG mutation
Try to increase opportunities to shrink vcc uses.

llvm-svn: 307313
2017-07-06 20:57:05 +00:00
Mark Searles 70359ac60d [AMDGPU] Turn on the new waitcnt insertion pass. Adjust tests.
-enable-si-insert-waitcnts=1 becomes the default
-enable-si-insert-waitcnts=0 to use old pass

Differential Revision: https://reviews.llvm.org/D33730

llvm-svn: 304551
2017-06-02 14:19:25 +00:00
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 b8f8dbc227 AMDGPU: Unify divergent function exits.
StructurizeCFG can't handle cases with multiple
returns creating regions with multiple exits.
Create a copy of UnifyFunctionExitNodes that only
unifies exit nodes that skips exit nodes
with uniform branch sources.

llvm-svn: 298729
2017-03-24 19:52:05 +00:00