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# cee313d2 17-Apr-2019 Eric Christopher <[email protected]>

Revert "Temporarily Revert "Add basic loop fusion pass.""

The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
Revision tags: llvmorg-8.0.0, llvmorg-8.0.0-rc5, llvmorg-8.0.0-rc4, llvmorg-8.0.0-rc3, llvmorg-7.1.0, llvmorg-7.1.0-rc1, llvmorg-8.0.0-rc2, llvmorg-8.0.0-rc1, llvmorg-7.0.1, llvmorg-7.0.1-rc3, llvmorg-7.0.1-rc2, llvmorg-7.0.1-rc1, llvmorg-7.0.0, llvmorg-7.0.0-rc3, llvmorg-7.0.0-rc2, llvmorg-7.0.0-rc1, llvmorg-6.0.1, llvmorg-6.0.1-rc3, llvmorg-6.0.1-rc2, llvmorg-6.0.1-rc1, llvmorg-5.0.2, llvmorg-5.0.2-rc2, llvmorg-5.0.2-rc1, llvmorg-6.0.0, llvmorg-6.0.0-rc3, llvmorg-6.0.0-rc2
# 4afb64e4 24-Jan-2018 Nicolai Haehnle <[email protected]>

Revert r321751, "StructurizeCFG: Fix broken backedge detection"

It causes regressions in various OpenGL test suites.

Keep the test cases introduced by r321751 as XFAIL, and add a test case
for the

Revert r321751, "StructurizeCFG: Fix broken backedge detection"

It causes regressions in various OpenGL test suites.

Keep the test cases introduced by r321751 as XFAIL, and add a test case
for the regression.

Change-Id: I90b4cc354f68cebe5fcef1f2422dc8fe1c6d3514
Bugzilla: https://bugs.llvm.org/show_bug.cgi?id=36015
llvm-svn: 323355

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Revision tags: llvmorg-6.0.0-rc1
# 35c4244a 04-Jan-2018 Matt Arsenault <[email protected]>

StructurizeCFG: xfail one of the testcases from r321751

It fails with -verify-region-info. This seems to be a issue
with RegionInfo itself which existed before.

llvm-svn: 321806
# 8070882b 03-Jan-2018 Matt Arsenault <[email protected]>

StructurizeCFG: Fix broken backedge detection

The work order was changed in r228186 from SCC order
to RPO with an arbitrary sorting function. The sorting
function attempted to move inner loop nodes

StructurizeCFG: Fix broken backedge detection

The work order was changed in r228186 from SCC order
to RPO with an arbitrary sorting function. The sorting
function attempted to move inner loop nodes earlier. This
was was apparently relying on an assumption that every block
in a given loop / the same loop depth would be seen before
visiting another loop. In the broken testcase, a block
outside of the loop was encountered before moving onto
another block in the same loop. The testcase would then
structurize such that one blocks unconditional successor
could never be reached.

Revert to plain RPO for the analysis phase. This fixes
detecting edges as backedges that aren't really.

The processing phase does use another visited set, and
I'm unclear on whether the order there is as important.
An arbitrary order doesn't work, and triggers some infinite
loops. The reversed RPO list seems to work and is closer
to the order that was used before, minus the arbitary
custom sorting.

A few of the changed tests now produce smaller code,
and a few are slightly worse looking.

llvm-svn: 321751

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