Displaying 4 results from an estimated 4 matches for "ementa".
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menta
2016 Jun 10
2
Early CSE clobbering llvm.assume
...d on, but it's not even implemented
there.
Short answer, without special casing this in magic ways, i wouldn't expect
this to get fixed anytime soon.
If we fixed assume in one of the ways i thought about, like bodik's
extended ssa:
http://homepages.dcc.ufmg.br/~fernando/classes/dcc888/ementa/slides/RangeAnalysis.pdf
You would at least see that the load result is used by an assume, and could
go look at that assume and so something with it. Currently, it's a few
steps away.
In the current scheme, assumes just float in air, and so it can be hard to
see what their effects touch
:)...
2016 Jun 10
3
Early CSE clobbering llvm.assume
...answer, without special casing this in magic ways, i wouldn't
>> expect this to get fixed anytime soon.
>>
>> If we fixed assume in one of the ways i thought about, like bodik's
>> extended ssa:
>>
>> http://homepages.dcc.ufmg.br/~fernando/classes/dcc888/ementa/slides/RangeAnalysis.pdf
>>
>> You would at least see that the load result is used by an assume, and
>> could go look at that assume and so something with it. Currently, it's a
>> few steps away.
>>
>> In the current scheme, assumes just float in air, and so...
2014 Jun 30
0
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2016 Jun 10
4
Early CSE clobbering llvm.assume
As of llvm 3.8, the early CSE pass seems to remove llvm.assume intrinsics.
Is this the expected behavior?
I've attached as small-ish example of this happening in my production code.
$ opt -early-cse before-early-cse.ll -S > after-early-cse.ll
Note the use of the assume intrinsic indicating that the loaded value
%channels equals 3. In a later pass I replace the load instruction with