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Vector Packet Processing
cpu.h
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1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef included_clib_cpu_h
17 #define included_clib_cpu_h
18 
19 #include <vppinfra/format.h>
20 
21 /*
22  * multiarchitecture support. Adding new entry will produce
23  * new graph node function variant optimized for specific cpu
24  * microarchitecture.
25  * Order is important for runtime selection, as 1st match wins...
26  */
27 
28 #if __x86_64__ && CLIB_DEBUG == 0
29 #define foreach_march_variant(macro, x) \
30  macro(avx2, x, "arch=core-avx2")
31 #else
32 #define foreach_march_variant(macro, x)
33 #endif
34 
35 
36 #if __GNUC__ > 4 && !__clang__
37 #define CLIB_CPU_OPTIMIZED __attribute__ ((optimize ("tree-vectorize")))
38 #else
39 #define CLIB_CPU_OPTIMIZED
40 #endif
41 
42 
43 #define CLIB_MULTIARCH_ARCH_CHECK(arch, fn, tgt) \
44  if (clib_cpu_supports_ ## arch()) \
45  return & fn ## _ ##arch;
46 
47 #define CLIB_MULTIARCH_SELECT_FN(fn,...) \
48  __VA_ARGS__ void * fn ## _multiarch_select(void) \
49 { \
50  foreach_march_variant(CLIB_MULTIARCH_ARCH_CHECK, fn) \
51  return & fn; \
52 }
53 
54 
55 #define foreach_x86_64_flags \
56 _ (sse3, 1, ecx, 0) \
57 _ (ssse3, 1, ecx, 9) \
58 _ (sse41, 1, ecx, 19) \
59 _ (sse42, 1, ecx, 20) \
60 _ (avx, 1, ecx, 28) \
61 _ (avx2, 7, ebx, 5) \
62 _ (avx512f, 7, ebx, 16) \
63 _ (aes, 1, ecx, 25) \
64 _ (sha, 7, ebx, 29) \
65 _ (invariant_tsc, 0x80000007, edx, 8)
66 
67 #if defined(__x86_64__)
68 #include "cpuid.h"
69 
70 static inline int
71 clib_get_cpuid (const u32 lev, u32 * eax, u32 * ebx, u32 * ecx, u32 * edx)
72 {
73  if ((u32) __get_cpuid_max (0x80000000 & lev, 0) < lev)
74  return 0;
75  if (lev == 7)
76  __cpuid_count (lev, 0, *eax, *ebx, *ecx, *edx);
77  else
78  __cpuid (lev, *eax, *ebx, *ecx, *edx);
79  return 1;
80 }
81 
82 
83 #define _(flag, func, reg, bit) \
84 static inline int \
85 clib_cpu_supports_ ## flag() \
86 { \
87  u32 __attribute__((unused)) eax, ebx = 0, ecx = 0, edx = 0; \
88  clib_get_cpuid (func, &eax, &ebx, &ecx, &edx); \
89  \
90  return ((reg & (1 << bit)) != 0); \
91 }
93 #undef _
94 #else
95 
96 #define _(flag, func, reg, bit) \
97 static inline int clib_cpu_supports_ ## flag() { return 0; }
99 #undef _
100 #endif
101 #endif
105 
106 /*
107  * fd.io coding-style-patch-verification: ON
108  *
109  * Local Variables:
110  * eval: (c-set-style "gnu")
111  * End:
112  */
foreach_x86_64_flags format_function_t format_cpu_uarch
Definition: cpu.h:102
format_function_t format_cpu_flags
Definition: cpu.h:104
u8 *( format_function_t)(u8 *s, va_list *args)
Definition: format.h:48
static int clib_get_cpuid(const u32 lev, u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
Definition: cpu.h:71
#define foreach_x86_64_flags
Definition: cpu.h:55
unsigned int u32
Definition: types.h:88
format_function_t format_cpu_model_name
Definition: cpu.h:103