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Common: Use function-level targeting for CRC32 (SSE4.2)

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This commit is contained in:
Stenzek 2016-12-23 23:48:55 +10:00
parent b74029ec57
commit 0f978227f5
1 changed files with 44 additions and 13 deletions
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57
Source/Core/Common/Hash.cpp
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@ -238,9 +238,11 @@ u64 GetMurmurHash3(const u8* src, u32 len, u32 samples)
}
// CRC32 hash using the SSE4.2 instruction
#if defined(_M_X86_64)
FUNCTION_TARGET_SSE42
u64 GetCRC32(const u8* src, u32 len, u32 samples)
{
#if _M_SSE >= 0x402 || defined(_M_ARM_64)
u64 h[4] = {len, 0, 0, 0};
u32 Step = (len / 8);
const u64* data = (const u64*)src;
@ -250,9 +252,7 @@ u64 GetCRC32(const u8* src, u32 len, u32 samples)
Step = Step / samples;
if (Step < 1)
Step = 1;
#endif
#if _M_SSE >= 0x402
while (data < end - Step * 3)
{
h[0] = _mm_crc32_u64(h[0], data[Step * 0]);
@ -274,7 +274,25 @@ u64 GetCRC32(const u8* src, u32 len, u32 samples)
memcpy(&temp, end, len & 7);
h[0] = _mm_crc32_u64(h[0], temp);
}
// FIXME: is there a better way to combine these partial hashes?
return h[0] + (h[1] << 10) + (h[2] << 21) + (h[3] << 32);
}
#elif defined(_M_ARM_64)
u64 GetCRC32(const u8* src, u32 len, u32 samples)
{
u64 h[4] = {len, 0, 0, 0};
u32 Step = (len / 8);
const u64* data = (const u64*)src;
const u64* end = data + Step;
if (samples == 0)
samples = std::max(Step, 1u);
Step = Step / samples;
if (Step < 1)
Step = 1;
// We should be able to use intrinsics for this
// Too bad the intrinsics for this instruction was added in GCC 4.9.1
// The Android NDK (as of r10e) only has GCC 4.9
@ -317,16 +335,20 @@ u64 GetCRC32(const u8* src, u32 len, u32 samples)
: [res] "=r"(h[0])
: [two] "r"(h[0]), [three] "r"(temp));
}
#endif
#if _M_SSE >= 0x402 || defined(_M_ARM_64)
// FIXME: is there a better way to combine these partial hashes?
return h[0] + (h[1] << 10) + (h[2] << 21) + (h[3] << 32);
#else
return 0;
#endif
}
#else
u64 GetCRC32(const u8* src, u32 len, u32 samples)
{
return 0;
}
#endif
/*
* NOTE: This hash function is used for custom texture loading/dumping, so
* it should not be changed, which would require all custom textures to be
@ -386,10 +408,13 @@ u64 GetHashHiresTexture(const u8* src, u32 len, u32 samples)
return h;
}
#else
// CRC32 hash using the SSE4.2 instruction
#if defined(_M_X86)
FUNCTION_TARGET_SSE42
u64 GetCRC32(const u8* src, u32 len, u32 samples)
{
#if _M_SSE >= 0x402
u32 h = len;
u32 Step = (len / 4);
const u32* data = (const u32*)src;
@ -407,11 +432,17 @@ u64 GetCRC32(const u8* src, u32 len, u32 samples)
const u8* data2 = (const u8*)end;
return (u64)_mm_crc32_u32(h, u32(data2[0]));
#else
return 0;
#endif
}
#else
u64 GetCRC32(const u8* src, u32 len, u32 samples)
{
return 0;
}
#endif
//-----------------------------------------------------------------------------
// Block read - if your platform needs to do endian-swapping or can only
// handle aligned reads, do the conversion here
@ -606,7 +637,7 @@ u64 GetHash64(const u8* src, u32 len, u32 samples)
// sets the hash function used for the texture cache
void SetHash64Function()
{
#if _M_SSE >= 0x402
#if defined(_M_X86_64) || defined(_M_X86)
if (cpu_info.bSSE4_2) // sse crc32 version
{
ptrHashFunction = &GetCRC32;