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LibC: Increase alignment for malloc() BigAllocationBlocks to 16 bytes

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commit 5f3773b715 increased alignment
for ChunckedBlocks, but not for BigAllocationBlocks.

This is required to make SSE instructions work.
This commit is contained in:
Peter Ross 2022-03-01 19:50:19 +11:00 • committed by Andreas Kling
parent 36af2fdc4f
commit feb19646df
2 changed files with 2 additions and 2 deletions
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2
Userland/Libraries/LibC/malloc.cpp
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@ -528,7 +528,7 @@ size_t malloc_size(void const* ptr)
auto* header = (const CommonHeader*)page_base; auto* header = (const CommonHeader*)page_base;
auto size = header->m_size; auto size = header->m_size;
if (header->m_magic == MAGIC_BIGALLOC_HEADER) if (header->m_magic == MAGIC_BIGALLOC_HEADER)
size -= sizeof(CommonHeader); size -= sizeof(BigAllocationBlock);
else else
VERIFY(header->m_magic == MAGIC_PAGE_HEADER); VERIFY(header->m_magic == MAGIC_PAGE_HEADER);
return size; return size;

2
Userland/Libraries/LibC/mallocdefs.h
View file

@ -46,7 +46,7 @@ struct BigAllocationBlock : public CommonHeader {
m_magic = MAGIC_BIGALLOC_HEADER; m_magic = MAGIC_BIGALLOC_HEADER;
m_size = size; m_size = size;
} }
unsigned char* m_slot[0]; alignas(16) unsigned char* m_slot[0];
}; };
struct FreelistEntry { struct FreelistEntry {