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Revision tags: llvmorg-18.1.8, llvmorg-18.1.7 |
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67025946 |
| 27-May-2024 |
Rouzbeh <rouzbeh.paktinat1@huawei.com> |
[LoopCacheAnalysis] Fix loop cache cost to always round the cost up to the nearest integer number (#88915)
Currently loop cache analysis uses following formula to evaluate cost of
an RefGroup for a
[LoopCacheAnalysis] Fix loop cache cost to always round the cost up to the nearest integer number (#88915)
Currently loop cache analysis uses following formula to evaluate cost of
an RefGroup for a consecutive memory access:
`RefCost=(TripCount*Stride)/CLS`
This cost evaluates to zero when `TripCount*Stride` is smaller than
cache-line-size. This results in wrong cost value for a loop and
misleads loopInterchange decisions as shown in [this
case](https://llvm.godbolt.org/z/jTz1vn4hn).
This patch fixes the problem by rounding the cost to 1 once this problem
happens.
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Revision tags: llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2 |
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| #
1aee1e1f |
| 05-Feb-2024 |
Nikita Popov <npopov@redhat.com> |
[Analysis] Convert tests to opaque pointers (NFC)
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Revision tags: llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2, llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4, llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init |
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| #
edb2fc6d |
| 12-Jul-2023 |
Nikita Popov <npopov@redhat.com> |
[llvm] Remove explicit -opaque-pointers flag from tests (NFC)
Opaque pointers mode is enabled by default, no need to explicitly
enable it.
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Revision tags: llvmorg-16.0.6, llvmorg-16.0.5, llvmorg-16.0.4, llvmorg-16.0.3, llvmorg-16.0.2, llvmorg-16.0.1, llvmorg-16.0.0, llvmorg-16.0.0-rc4, llvmorg-16.0.0-rc3, llvmorg-16.0.0-rc2, llvmorg-16.0.0-rc1, llvmorg-17-init, llvmorg-15.0.7, llvmorg-15.0.6, llvmorg-15.0.5, llvmorg-15.0.4, llvmorg-15.0.3, working, llvmorg-15.0.2, llvmorg-15.0.1, llvmorg-15.0.0, llvmorg-15.0.0-rc3, llvmorg-15.0.0-rc2, llvmorg-15.0.0-rc1, llvmorg-16-init |
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| #
05ccde80 |
| 21-Jul-2022 |
Congzhe Cao <congzhe.cao@huawei.com> |
[LoopCacheAnalysis] Fix a type mismatch problem in cost calculation
There is a problem in loop cache analysis that the types of SCEV variables
`Coeff` and `ElemSize` in function `isConsecutive()` ma
[LoopCacheAnalysis] Fix a type mismatch problem in cost calculation
There is a problem in loop cache analysis that the types of SCEV variables
`Coeff` and `ElemSize` in function `isConsecutive()` may not match. The
mismatch would cause SCEV failures when `Coeff` is multiplied with `ElemSize`.
The fix in this patch is to extend the type of both `Coeff` and `ElemSize` to
whichever is wider in those two variables. As a clean-up, duplicate calculations
of `Stride` in `computeRefCost()` is then removed.
Reviewed By: Meinersbur, #loopoptwg
Differential Revision: https://reviews.llvm.org/D128877
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Revision tags: llvmorg-14.0.6 |
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| #
a9dccb00 |
| 16-Jun-2022 |
Congzhe Cao <congzhe.cao@huawei.com> |
[TargetTransformInfo] Added an opt/llc option for cache line size
In some passes we need a valid number of cache line size to do analysis or
transformation, e.g., loop cache analysis and loop date p
[TargetTransformInfo] Added an opt/llc option for cache line size
In some passes we need a valid number of cache line size to do analysis or
transformation, e.g., loop cache analysis and loop date prefetch. However,
for some backend targets, `TTIImpl->getCacheLineSize()` is not implemented
and hence 'TTI.getCacheLineSize()' would just return 0 which eventually might
produce invalid result.
In this patch we add a user-specified opt/llc option for cache line size.
If the option is specified by users we use the value supplied, otherwise we
fall-back to the default value obtained from `TTIImpl->->getCacheLineSize()`.
The powerpc target already has such an option, this patch generalizes
this option to TargetTransformInfo.cpp.
Reviewed By: bmahjour, #loopoptwg
Differential Revision: https://reviews.llvm.org/D127342
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