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Common/Hash: use __crc32d() intrinsic on ARM64

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This commit is contained in:
Tillmann Karras 2017-05-03 06:40:47 +01:00
parent e4e37b3a82
commit 25f61f0329
1 changed files with 12 additions and 29 deletions
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41
Source/Core/Common/Hash.cpp
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@ -9,6 +9,10 @@
#include "Common/CommonFuncs.h"
#include "Common/Intrinsics.h"
#ifdef _M_ARM_64
#include <arm_acle.h>
#endif
static u64 (*ptrHashFunction)(const u8* src, u32 len, u32 samples) = &GetMurmurHash3;
// uint32_t
@ -293,47 +297,26 @@ u64 GetCRC32(const u8* src, u32 len, u32 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
// Once the Android NDK has a newer GCC version, update these to use intrinsics
while (data < end - Step * 3)
{
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[0])
: [two] "r"(h[0]), [three] "r"(data[Step * 0]));
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[1])
: [two] "r"(h[1]), [three] "r"(data[Step * 1]));
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[2])
: [two] "r"(h[2]), [three] "r"(data[Step * 2]));
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[3])
: [two] "r"(h[3]), [three] "r"(data[Step * 3]));
h[0] = __crc32d(h[0], data[Step * 0]);
h[1] = __crc32d(h[1], data[Step * 1]);
h[2] = __crc32d(h[2], data[Step * 2]);
h[3] = __crc32d(h[3], data[Step * 3]);
data += Step * 4;
}
if (data < end - Step * 0)
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[0])
: [two] "r"(h[0]), [three] "r"(data[Step * 0]));
h[0] = __crc32d(h[0], data[Step * 0]);
if (data < end - Step * 1)
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[1])
: [two] "r"(h[1]), [three] "r"(data[Step * 1]));
h[1] = __crc32d(h[1], data[Step * 1]);
if (data < end - Step * 2)
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[2])
: [two] "r"(h[2]), [three] "r"(data[Step * 2]));
h[2] = __crc32d(h[2], data[Step * 2]);
if (len & 7)
{
u64 temp = 0;
memcpy(&temp, end, len & 7);
asm("crc32x %w[res], %w[two], %x[three]"
: [res] "=r"(h[0])
: [two] "r"(h[0]), [three] "r"(temp));
h[0] = __crc32d(h[0], temp);
}
// FIXME: is there a better way to combine these partial hashes?