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# 3ea4bc78 27-Apr-2021 Jingu Kang <[email protected]>

[IRCE] Add tests for conservative bound check

Prevent cases in which the start value of IV is bigger than bound for
increasing.

Prevent cases in which the start value of IV is smaller than bound fo

[IRCE] Add tests for conservative bound check

Prevent cases in which the start value of IV is bigger than bound for
increasing.

Prevent cases in which the start value of IV is smaller than bound for
decreasing.

Differential Revision: https://reviews.llvm.org/D101174

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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
# 97375359 12-Apr-2018 Sam Parker <[email protected]>

[IRCE] isKnownNonNegative helper function

Created a helper function to query for non negative SCEVs. Uses the
SGE predicate to catch constants that could be interpreted as
negative.

Differential Re

[IRCE] isKnownNonNegative helper function

Created a helper function to query for non negative SCEVs. Uses the
SGE predicate to catch constants that could be interpreted as
negative.

Differential Revision: https://reviews.llvm.org/D45481

llvm-svn: 329907

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Revision tags: llvmorg-5.0.2, llvmorg-5.0.2-rc2
# 90b7f4f7 27-Mar-2018 Sam Parker <[email protected]>

[IRCE] Enable decreasing loops of non-const bound

As a follow-up to r328480, this updates the logic for the decreasing
safety checks in a similar manner:
- CanBeMax is replaced by CannotBeMaxInLoop

[IRCE] Enable decreasing loops of non-const bound

As a follow-up to r328480, this updates the logic for the decreasing
safety checks in a similar manner:
- CanBeMax is replaced by CannotBeMaxInLoop which queries
isLoopEntryGuardedByCond on the maximum value.
- SumCanReachMin is replaced by isSafeDecreasingBound which includes
some logic from parseLoopStructure and, again, has been updated to
use isLoopEntryGuardedByCond on the given bounds.

Differential Revision: https://reviews.llvm.org/D44776

llvm-svn: 328613

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# 53a423a4 26-Mar-2018 Sam Parker <[email protected]>

[IRCE] Enable increasing loops of variable bounds

CanBeMin is currently used which will report true for any unknown
values, but often a check is performed outside the loop which covers
this situ

[IRCE] Enable increasing loops of variable bounds

CanBeMin is currently used which will report true for any unknown
values, but often a check is performed outside the loop which covers
this situation:

for (int i = 0; i < N; ++i)
...

if (N > 0)
for (int i = 0; i < N; ++i)
...

So I've add 'LoopGuardedAgainstMin' which reports whether N is
greater than the minimum value which then allows loop with a variable
loop count to be optimised. I've also moved the increasing bound
checking into its own function and replaced SumCanReachMax is another
isLoopEntryGuardedByCond function.

llvm-svn: 328480

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