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on windows use 4TiB area for aligned allocation

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This commit is contained in:
daan 2019-08-23 21:38:45 -07:00
parent eb25093b13
commit 25ea9cf142
1 changed files with 12 additions and 0 deletions
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src/os.c
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@ -184,6 +184,18 @@ static bool mi_os_mem_free(void* addr, size_t size, mi_stats_t* stats)
#ifdef _WIN32
static void* mi_win_virtual_allocx(void* addr, size_t size, size_t try_alignment, DWORD flags) {
#if (MI_INTPTR_SIZE >= 8)
// on 64-bit systems, use the virtual address area after 4TiB for 4MiB aligned allocations
static volatile intptr_t aligned_base = ((intptr_t)4 << 40); // starting at 4TiB
if (addr == NULL && try_alignment > 0 &&
try_alignment <= MI_SEGMENT_SIZE && (size%MI_SEGMENT_SIZE) == 0)
{
intptr_t hint = mi_atomic_add(&aligned_base, size) - size;
if (hint%try_alignment == 0) {
return VirtualAlloc((void*)hint, size, flags, PAGE_READWRITE);
}
}
#endif
#if defined(MEM_EXTENDED_PARAMETER_TYPE_BITS)
if (try_alignment > 0 && (try_alignment % _mi_os_page_size()) == 0 && pVirtualAlloc2 != NULL) {
// on modern Windows try use VirtualAlloc2 for aligned allocation