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Don't enable SSE4 under Emscripten (#8213, #8169, #4933)

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Amend 326dc95f9
This commit is contained in:
slowriot 2024-12-06 17:50:44 +00:00 committed by ocornut
parent 3f3c62a3c9
commit 2671f68f7f
2 changed files with 9 additions and 5 deletions
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10
imgui.cpp
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@ -2150,7 +2150,7 @@ void ImFormatStringToTempBufferV(const char** out_buf, const char** out_buf_end,
}
}
#ifndef IMGUI_ENABLE_SSE4_2
#ifndef IMGUI_ENABLE_SSE4_2_CRC
// CRC32 needs a 1KB lookup table (not cache friendly)
// Although the code to generate the table is simple and shorter than the table itself, using a const table allows us to easily:
// - avoid an unnecessary branch/memory tap, - keep the ImHashXXX functions usable by static constructors, - make it thread-safe.
@ -2184,7 +2184,7 @@ ImGuiID ImHashData(const void* data_p, size_t data_size, ImGuiID seed)
ImU32 crc = ~seed;
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_CRC
const ImU32* crc32_lut = GCrc32LookupTable;
while (data < data_end)
crc = (crc >> 8) ^ crc32_lut[(crc & 0xFF) ^ *data++];
@ -2212,7 +2212,7 @@ ImGuiID ImHashStr(const char* data_p, size_t data_size, ImGuiID seed)
seed = ~seed;
ImU32 crc = seed;
const unsigned char* data = (const unsigned char*)data_p;
#ifndef IMGUI_ENABLE_SSE4_2
#ifndef IMGUI_ENABLE_SSE4_2_CRC
const ImU32* crc32_lut = GCrc32LookupTable;
#endif
if (data_size != 0)
@ -2222,7 +2222,7 @@ ImGuiID ImHashStr(const char* data_p, size_t data_size, ImGuiID seed)
unsigned char c = *data++;
if (c == '#' && data_size >= 2 && data[0] == '#' && data[1] == '#')
crc = seed;
#ifndef IMGUI_ENABLE_SSE4_2
#ifndef IMGUI_ENABLE_SSE4_2_CRC
crc = (crc >> 8) ^ crc32_lut[(crc & 0xFF) ^ c];
#else
crc = _mm_crc32_u8(crc, c);
@ -2235,7 +2235,7 @@ ImGuiID ImHashStr(const char* data_p, size_t data_size, ImGuiID seed)
{
if (c == '#' && data[0] == '#' && data[1] == '#')
crc = seed;
#ifndef IMGUI_ENABLE_SSE4_2
#ifndef IMGUI_ENABLE_SSE4_2_CRC
crc = (crc >> 8) ^ crc32_lut[(crc & 0xFF) ^ c];
#else
crc = _mm_crc32_u8(crc, c);

4
imgui_internal.h
View File

@ -66,6 +66,10 @@ Index of this file:
#include <nmmintrin.h>
#endif
#endif
// Emscripten has partial SSE 4.2 support where _mm_crc32_u32 is not available. See https://emscripten.org/docs/porting/simd.html#id11 and #8213
#if defined(IMGUI_ENABLE_SSE4_2) || !defined(__EMSCRIPTEN__)
#define IMGUI_ENABLE_SSE4_2_CRC
#endif
// Visual Studio warnings
#ifdef _MSC_VER