Florian Hahn
7c34848ae1
[VPlan] Hoist loads with invariant addresses using noalias metadata. ( #166247 )
...
This patch implements a transform to hoists single-scalar replicated
loads with invariant addresses out of the vector loop to the preheader
when scoped noalias metadata proves they cannot alias with any stores in
the loop.
This enables hosting of loads we can prove do not alias any stores in
the loop due to memory runtime checks added during vectorization.
PR: https://github.com/llvm/llvm-project/pull/166247
2025-11-18 09:35:48 +00:00
Florian Hahn
b9ce7656e9
[VPlan] Add VPInstruction to unpack vector values to scalars. ( #155670 )
...
Add a new Unpack VPInstruction (name to be improved) to explicitly
extract scalars values from vectors.
Test changes are movements of the extracts: they are no generated
together and also directly after the producer.
Depends on https://github.com/llvm/llvm-project/pull/155102 (included in
PR)
PR: https://github.com/llvm/llvm-project/pull/155670
2025-10-19 18:49:05 +00:00
Florian Hahn
9b1b93766d
Reapply "[SCEVExp] Add helper to clean up dead instructions after expansion. ( #157308 )"
...
This reverts commit eeb43806eb1b40e690aeeba496ee974172202df9.
Recommit with with a fix for MSan failure (
https://lab.llvm.org/buildbot/#/builders/169/builds/14799 ), by adding a
set to track deleted values. Using the InsertedInstructions set is not
sufficient, as it use asserting value handles as keys, which may
dereference the value at construction.
Original message:
Add new helper to erase dead instructions inserted during SCEV expansion
but not being used due to InstSimplifyFolder simplifications.
Together with https://github.com/llvm/llvm-project/pull/157307 this also
allows removing some specialized folds, e.g.
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp#L2205
PR: https://github.com/llvm/llvm-project/pull/157308
2025-09-09 09:47:41 +01:00
Florian Hahn
eeb43806eb
Revert "[SCEVExp] Add helper to clean up dead instructions after expansion. ( #157308 )"
...
This reverts commit 528b13df571c86a2c5b8305d7974f135d785e30f.
Triggers MSan errors in some configurations, e.g.
https://lab.llvm.org/buildbot/#/builders/169/builds/14799
2025-09-08 14:52:28 +01:00
Florian Hahn
528b13df57
[SCEVExp] Add helper to clean up dead instructions after expansion. ( #157308 )
...
Add new helper to erase dead instructions inserted during SCEV expansion
but not being used due to InstSimplifyFolder simplifications.
Together with https://github.com/llvm/llvm-project/pull/157307 this also
allows removing some specialized folds, e.g.
https://github.com/llvm/llvm-project/blob/main/llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp#L2205
PR: https://github.com/llvm/llvm-project/pull/157308
2025-09-08 10:53:20 +01:00
Florian Hahn
f84f4e1e05
[LV] Don't crash on inner loops with RT checks in VPlan-native path.
...
Assert that we only generate runtime checks for inner loops in
emitMemRuntimeChecks, instead of returning nullptr in the VPlan-native
path, which is causing crashes and incorrect code.
2025-03-10 20:28:56 +00:00
