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Minor improvement to codegen for remaining_bytes

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This commit is contained in:
Matthew Parkinson
2021-11-24 14:33:57 +00:00
committed by Matthew Parkinson
parent 9332557bb0
commit d725beca90
1 changed files with 9 additions and 4 deletions
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13
src/mem/sizeclasstable.h
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@@ -274,6 +274,11 @@ namespace snmalloc
return sizeclass_metadata.fast(sizeclass).size;
}
inline static size_t sizeclass_full_to_slab_size(sizeclass_t sizeclass)
{
return sizeclass_metadata.fast(sizeclass).slab_mask + 1;
}
inline static size_t sizeclass_to_slab_size(smallsizeclass_t sizeclass)
{
return sizeclass_metadata.fast_small(sizeclass).slab_mask + 1;
@@ -321,10 +326,10 @@ namespace snmalloc
.capacity;
}
inline static size_t mod_by_sizeclass(smallsizeclass_t sc, size_t offset)
inline static size_t mod_by_sizeclass(sizeclass_t sc, size_t offset)
{
// Only works up to certain offsets, exhaustively tested by rounding.cc
auto meta = sizeclass_metadata.fast_small(sc);
auto meta = sizeclass_metadata.fast(sc);
// Powers of two should use straigt mask.
SNMALLOC_ASSERT(meta.mod_mult != 0);
@@ -353,8 +358,8 @@ namespace snmalloc
return addr & (sizeclass_metadata.fast(sc).size - 1);
}
address_t offset = addr & (sizeclass_to_slab_size(sc.as_small()) - 1);
return mod_by_sizeclass(sc.as_small(), offset);
address_t offset = addr & (sizeclass_full_to_slab_size(sc) - 1);
return mod_by_sizeclass(sc, offset);
}
inline static size_t remaining_bytes(sizeclass_t sc, address_t addr)