Most platforms inherently have a size_t alignment of 4, but this isn't
true on every platform LLVM has some degree of backend support for.
Accordingly, it's simple enough to just set the min alignment of Block
to 4 and lose the static_assert.
FreeListHeap uses the _end symbol which conflicts with the _end symbol
defined by GPU start.cpp files so for now we exclude the test and the
fuzzer on GPU.
This reverts commit 93b83642ee34d0092b94776728dad0117c2b72a1.
- Correct riscv32 assumption about alignment (bit of a hack).
- Fix test case where the largest_small and smallest sizes are the
same.
- Fix assertion expressions.
- Fix incorrect small size in freestore_test.
- There may only be one small size for high alignment and small
pointers (riscv32).
- Don't rely on stack alignment in FreeList test.
This reworks the free store implementation in libc's malloc to use a
dlmalloc-style binary trie of circularly linked FIFO free lists. This
data structure can be maintained in logarithmic time, but it still
permits a relatively small implementation compared to other
logarithmic-time ordered maps.
The implementation doesn't do the various bitwise tricks or
optimizations used in actual dlmalloc; it instead optimizes for
(relative) readability and minimum code size. Specific optimization can
be added as necessary given future profiling.
Reverts llvm/llvm-project#86137
Some aarch64 compilers seem to consider that `uint128_t` is not
`is_trivially_constructible` which prevents `bit_cast`-ing.
This patch moves most of the multiprecision logic to the `multiword`
namespace and simplifies some logic in `BigInt`. It also fully
implements the mask and count functions and increases test coverage.
`math_extras.h` is also reworked to make it more concise.
