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Misc: amend crc32 to use _mm_crc32_u32. (#8169, #4933)

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ocornut 2024-11-27 12:34:16 +01:00
parent 326dc95f9c
commit 2d660108b2
1 changed files with 8 additions and 2 deletions
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10
imgui.cpp
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@ -2183,13 +2183,19 @@ ImGuiID ImHashData(const void* data_p, size_t data_size, ImGuiID seed)
{ {
ImU32 crc = ~seed; ImU32 crc = ~seed;
const unsigned char* data = (const unsigned char*)data_p; const unsigned char* data = (const unsigned char*)data_p;
const unsigned char *data_end = (const unsigned char*)data_p + data_size;
#ifndef IMGUI_ENABLE_SSE4_2 #ifndef IMGUI_ENABLE_SSE4_2
const ImU32* crc32_lut = GCrc32LookupTable; const ImU32* crc32_lut = GCrc32LookupTable;
while (data_size-- != 0) while (data < data_end)
crc = (crc >> 8) ^ crc32_lut[(crc & 0xFF) ^ *data++]; crc = (crc >> 8) ^ crc32_lut[(crc & 0xFF) ^ *data++];
return ~crc; return ~crc;
#else #else
while (data_size-- != 0) while (data + 4 <= data_end)
{
crc = _mm_crc32_u32(crc, *(ImU32*)data);
data += 4;
}
while (data < data_end)
crc = _mm_crc32_u8(crc, *data++); crc = _mm_crc32_u8(crc, *data++);
return ~crc; return ~crc;
#endif #endif