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authorGravatar bunnei2021-02-15 14:46:04 -0800
committerGravatar bunnei2021-02-15 14:46:04 -0800
commit0a91599aec5a0c4d4c87d3e23fea07dbb6ced0f7 (patch)
tree1319cde17514c49d01045379d3a7ce2b4ccace0a /src/common/x64
parentMerge pull request #5939 from Morph1984/web_types (diff)
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common: Merge uint128 to a single header file with inlines.
Diffstat (limited to 'src/common/x64')
-rw-r--r--src/common/x64/native_clock.cpp58
1 files changed, 0 insertions, 58 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp
index a65f6b832..87de40624 100644
--- a/src/common/x64/native_clock.cpp
+++ b/src/common/x64/native_clock.cpp
@@ -8,68 +8,10 @@
8#include <mutex> 8#include <mutex>
9#include <thread> 9#include <thread>
10 10
11#ifdef _MSC_VER
12#include <intrin.h>
13
14#pragma intrinsic(__umulh)
15#pragma intrinsic(_udiv128)
16#else
17#include <x86intrin.h>
18#endif
19
20#include "common/atomic_ops.h" 11#include "common/atomic_ops.h"
21#include "common/uint128.h" 12#include "common/uint128.h"
22#include "common/x64/native_clock.h" 13#include "common/x64/native_clock.h"
23 14
24namespace {
25
26[[nodiscard]] u64 GetFixedPoint64Factor(u64 numerator, u64 divisor) {
27#ifdef __SIZEOF_INT128__
28 const auto base = static_cast<unsigned __int128>(numerator) << 64ULL;
29 return static_cast<u64>(base / divisor);
30#elif defined(_M_X64) || defined(_M_ARM64)
31 std::array<u64, 2> r = {0, numerator};
32 u64 remainder;
33#if _MSC_VER < 1923
34 return udiv128(r[1], r[0], divisor, &remainder);
35#else
36 return _udiv128(r[1], r[0], divisor, &remainder);
37#endif
38#else
39 // This one is bit more inaccurate.
40 return MultiplyAndDivide64(std::numeric_limits<u64>::max(), numerator, divisor);
41#endif
42}
43
44[[nodiscard]] u64 MultiplyHigh(u64 a, u64 b) {
45#ifdef __SIZEOF_INT128__
46 return (static_cast<unsigned __int128>(a) * static_cast<unsigned __int128>(b)) >> 64;
47#elif defined(_M_X64) || defined(_M_ARM64)
48 return __umulh(a, b); // MSVC
49#else
50 // Generic fallback
51 const u64 a_lo = u32(a);
52 const u64 a_hi = a >> 32;
53 const u64 b_lo = u32(b);
54 const u64 b_hi = b >> 32;
55
56 const u64 a_x_b_hi = a_hi * b_hi;
57 const u64 a_x_b_mid = a_hi * b_lo;
58 const u64 b_x_a_mid = b_hi * a_lo;
59 const u64 a_x_b_lo = a_lo * b_lo;
60
61 const u64 carry_bit = (static_cast<u64>(static_cast<u32>(a_x_b_mid)) +
62 static_cast<u64>(static_cast<u32>(b_x_a_mid)) + (a_x_b_lo >> 32)) >>
63 32;
64
65 const u64 multhi = a_x_b_hi + (a_x_b_mid >> 32) + (b_x_a_mid >> 32) + carry_bit;
66
67 return multhi;
68#endif
69}
70
71} // namespace
72
73namespace Common { 15namespace Common {
74 16
75u64 EstimateRDTSCFrequency() { 17u64 EstimateRDTSCFrequency() {