Files
clang-p2996/llvm/test/Transforms/LoopVectorize
Roman Lebedev 2eaef53023 [TTI] BasicTTIImplBase::getInterleavedMemoryOpCost(): fix load discounting
The math here is:
Cost of 1 load = cost of n loads / n
Cost of live loads = num live loads * Cost of 1 load
Cost of live loads = num live loads * (cost of n loads / n)
Cost of live loads = cost of n loads * (num live loads / n)

But, all the variables here are integers,
and integer division rounds down,
but this calculation clearly expects float semantics.

Instead multiply upfront, and then perform round-up-division.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D112302
2021-10-22 14:08:58 +03:00
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