ParticleTileData: No Restrict in Storage #3245
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Remove the `restrict` qualifier from `GpuArray` members in `ParticleTileData`. We see compilation problems with, among others Clang 14.0.6 and AppleClang, for this construct. We expect that using `restrict` (`AMREX_RESTRICT`) on APIs as well as aliased pointers in these arrays before access should be sufficient to prevent that the compiler thinks that individual arrays alias each other in hot loops.
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WeiqunZhang
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Apr 7, 2023
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guj
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Jul 13, 2023
## Summary Remove the `restrict` qualifier from `GpuArray` members in `ParticleTileData`. We see compilation problems with, among others Clang 14.0.6 and AppleClang, for this construct. We expect that using `restrict` (`AMREX_RESTRICT`) on APIs as well as aliased pointers in these arrays before access should be sufficient to prevent that the compiler thinks that individual arrays alias each other in hot loops. ## Additional background - WarpX build regressions since 23.03, e.g., - conda-forge/warpx-feedstock#63 - conda-forge/warpx-feedstock#64 - ECP-WarpX/WarpX#3817 - independently, about to be remove in AMReX-Codes#2878
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Summary
Remove the
restrictqualifier fromGpuArraymembers inParticleTileData. We see compilation problems with, among others Clang 14.0.6 and AppleClang, for this construct.We expect that using
restrict(AMREX_RESTRICT) on APIs as well as aliased pointers in these arrays before access should be sufficient to prevent that the compiler thinks that individual arrays alias each other in hot loops.Additional background
Checklist
The proposed changes: