/src/botan/build/include/botan/bswap.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Byte Swapping Operations |
3 | | * (C) 1999-2011,2018 Jack Lloyd |
4 | | * (C) 2007 Yves Jerschow |
5 | | * |
6 | | * Botan is released under the Simplified BSD License (see license.txt) |
7 | | */ |
8 | | |
9 | | #ifndef BOTAN_BYTE_SWAP_H_ |
10 | | #define BOTAN_BYTE_SWAP_H_ |
11 | | |
12 | | #include <botan/types.h> |
13 | | |
14 | | #if defined(BOTAN_BUILD_COMPILER_IS_MSVC) |
15 | | #include <stdlib.h> |
16 | | #endif |
17 | | |
18 | | BOTAN_FUTURE_INTERNAL_HEADER(bswap.h) |
19 | | |
20 | | namespace Botan { |
21 | | |
22 | | /** |
23 | | * Swap a 16 bit integer |
24 | | */ |
25 | | inline uint16_t reverse_bytes(uint16_t val) |
26 | 125k | { |
27 | 125k | #if defined(BOTAN_BUILD_COMPILER_IS_GCC) || defined(BOTAN_BUILD_COMPILER_IS_CLANG) || defined(BOTAN_BUILD_COMPILER_IS_XLC) |
28 | 125k | return __builtin_bswap16(val); |
29 | | #else |
30 | | return static_cast<uint16_t>((val << 8) | (val >> 8)); |
31 | | #endif |
32 | | } |
33 | | |
34 | | /** |
35 | | * Swap a 32 bit integer |
36 | | */ |
37 | | inline uint32_t reverse_bytes(uint32_t val) |
38 | 14.8M | { |
39 | 14.8M | #if defined(BOTAN_BUILD_COMPILER_IS_GCC) || defined(BOTAN_BUILD_COMPILER_IS_CLANG) || defined(BOTAN_BUILD_COMPILER_IS_XLC) |
40 | 14.8M | return __builtin_bswap32(val); |
41 | 14.8M | |
42 | | #elif defined(BOTAN_BUILD_COMPILER_IS_MSVC) |
43 | | return _byteswap_ulong(val); |
44 | | |
45 | | #elif defined(BOTAN_USE_GCC_INLINE_ASM) && defined(BOTAN_TARGET_CPU_IS_X86_FAMILY) |
46 | | |
47 | | // GCC-style inline assembly for x86 or x86-64 |
48 | | asm("bswapl %0" : "=r" (val) : "0" (val)); |
49 | | return val; |
50 | | |
51 | | #else |
52 | | // Generic implementation |
53 | | uint16_t hi = static_cast<uint16_t>(val >> 16); |
54 | | uint16_t lo = static_cast<uint16_t>(val); |
55 | | |
56 | | hi = reverse_bytes(hi); |
57 | | lo = reverse_bytes(lo); |
58 | | |
59 | | return (static_cast<uint32_t>(lo) << 16) | hi; |
60 | | #endif |
61 | | } |
62 | | |
63 | | /** |
64 | | * Swap a 64 bit integer |
65 | | */ |
66 | | inline uint64_t reverse_bytes(uint64_t val) |
67 | 9.12M | { |
68 | 9.12M | #if defined(BOTAN_BUILD_COMPILER_IS_GCC) || defined(BOTAN_BUILD_COMPILER_IS_CLANG) || defined(BOTAN_BUILD_COMPILER_IS_XLC) |
69 | 9.12M | return __builtin_bswap64(val); |
70 | 9.12M | |
71 | | #elif defined(BOTAN_BUILD_COMPILER_IS_MSVC) |
72 | | return _byteswap_uint64(val); |
73 | | |
74 | | #elif defined(BOTAN_USE_GCC_INLINE_ASM) && defined(BOTAN_TARGET_ARCH_IS_X86_64) |
75 | | // GCC-style inline assembly for x86-64 |
76 | | asm("bswapq %0" : "=r" (val) : "0" (val)); |
77 | | return val; |
78 | | |
79 | | #else |
80 | | /* Generic implementation. Defined in terms of 32-bit bswap so any |
81 | | * optimizations in that version can help. |
82 | | */ |
83 | | |
84 | | uint32_t hi = static_cast<uint32_t>(val >> 32); |
85 | | uint32_t lo = static_cast<uint32_t>(val); |
86 | | |
87 | | hi = reverse_bytes(hi); |
88 | | lo = reverse_bytes(lo); |
89 | | |
90 | | return (static_cast<uint64_t>(lo) << 32) | hi; |
91 | | #endif |
92 | | } |
93 | | |
94 | | /** |
95 | | * Swap 4 Ts in an array |
96 | | */ |
97 | | template<typename T> |
98 | | inline void bswap_4(T x[4]) |
99 | 0 | { |
100 | 0 | x[0] = reverse_bytes(x[0]); |
101 | 0 | x[1] = reverse_bytes(x[1]); |
102 | 0 | x[2] = reverse_bytes(x[2]); |
103 | 0 | x[3] = reverse_bytes(x[3]); |
104 | 0 | } Unexecuted instantiation: void Botan::bswap_4<unsigned int>(unsigned int*) Unexecuted instantiation: void Botan::bswap_4<unsigned long>(unsigned long*) |
105 | | |
106 | | } |
107 | | |
108 | | #endif |