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comparison clang/lib/Headers/__clang_cuda_builtin_vars.h @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 2e18cbf3894f
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147:c2174574ed3a 150:1d019706d866
1 /*===---- cuda_builtin_vars.h - CUDA built-in variables ---------------------===
2 *
3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 * See https://llvm.org/LICENSE.txt for license information.
5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 *
7 *===-----------------------------------------------------------------------===
8 */
9
10 #ifndef __CUDA_BUILTIN_VARS_H
11 #define __CUDA_BUILTIN_VARS_H
12
13 // Forward declares from vector_types.h.
14 struct uint3;
15 struct dim3;
16
17 // The file implements built-in CUDA variables using __declspec(property).
18 // https://msdn.microsoft.com/en-us/library/yhfk0thd.aspx
19 // All read accesses of built-in variable fields get converted into calls to a
20 // getter function which in turn calls the appropriate builtin to fetch the
21 // value.
22 //
23 // Example:
24 // int x = threadIdx.x;
25 // IR output:
26 // %0 = call i32 @llvm.nvvm.read.ptx.sreg.tid.x() #3
27 // PTX output:
28 // mov.u32 %r2, %tid.x;
29
30 #define __CUDA_DEVICE_BUILTIN(FIELD, INTRINSIC) \
31 __declspec(property(get = __fetch_builtin_##FIELD)) unsigned int FIELD; \
32 static inline __attribute__((always_inline)) \
33 __attribute__((device)) unsigned int __fetch_builtin_##FIELD(void) { \
34 return INTRINSIC; \
35 }
36
37 #if __cplusplus >= 201103L
38 #define __DELETE =delete
39 #else
40 #define __DELETE
41 #endif
42
43 // Make sure nobody can create instances of the special variable types. nvcc
44 // also disallows taking address of special variables, so we disable address-of
45 // operator as well.
46 #define __CUDA_DISALLOW_BUILTINVAR_ACCESS(TypeName) \
47 __attribute__((device)) TypeName() __DELETE; \
48 __attribute__((device)) TypeName(const TypeName &) __DELETE; \
49 __attribute__((device)) void operator=(const TypeName &) const __DELETE; \
50 __attribute__((device)) TypeName *operator&() const __DELETE
51
52 struct __cuda_builtin_threadIdx_t {
53 __CUDA_DEVICE_BUILTIN(x,__nvvm_read_ptx_sreg_tid_x());
54 __CUDA_DEVICE_BUILTIN(y,__nvvm_read_ptx_sreg_tid_y());
55 __CUDA_DEVICE_BUILTIN(z,__nvvm_read_ptx_sreg_tid_z());
56 // threadIdx should be convertible to uint3 (in fact in nvcc, it *is* a
57 // uint3). This function is defined after we pull in vector_types.h.
58 __attribute__((device)) operator uint3() const;
59 private:
60 __CUDA_DISALLOW_BUILTINVAR_ACCESS(__cuda_builtin_threadIdx_t);
61 };
62
63 struct __cuda_builtin_blockIdx_t {
64 __CUDA_DEVICE_BUILTIN(x,__nvvm_read_ptx_sreg_ctaid_x());
65 __CUDA_DEVICE_BUILTIN(y,__nvvm_read_ptx_sreg_ctaid_y());
66 __CUDA_DEVICE_BUILTIN(z,__nvvm_read_ptx_sreg_ctaid_z());
67 // blockIdx should be convertible to uint3 (in fact in nvcc, it *is* a
68 // uint3). This function is defined after we pull in vector_types.h.
69 __attribute__((device)) operator uint3() const;
70 private:
71 __CUDA_DISALLOW_BUILTINVAR_ACCESS(__cuda_builtin_blockIdx_t);
72 };
73
74 struct __cuda_builtin_blockDim_t {
75 __CUDA_DEVICE_BUILTIN(x,__nvvm_read_ptx_sreg_ntid_x());
76 __CUDA_DEVICE_BUILTIN(y,__nvvm_read_ptx_sreg_ntid_y());
77 __CUDA_DEVICE_BUILTIN(z,__nvvm_read_ptx_sreg_ntid_z());
78 // blockDim should be convertible to dim3 (in fact in nvcc, it *is* a
79 // dim3). This function is defined after we pull in vector_types.h.
80 __attribute__((device)) operator dim3() const;
81 private:
82 __CUDA_DISALLOW_BUILTINVAR_ACCESS(__cuda_builtin_blockDim_t);
83 };
84
85 struct __cuda_builtin_gridDim_t {
86 __CUDA_DEVICE_BUILTIN(x,__nvvm_read_ptx_sreg_nctaid_x());
87 __CUDA_DEVICE_BUILTIN(y,__nvvm_read_ptx_sreg_nctaid_y());
88 __CUDA_DEVICE_BUILTIN(z,__nvvm_read_ptx_sreg_nctaid_z());
89 // gridDim should be convertible to dim3 (in fact in nvcc, it *is* a
90 // dim3). This function is defined after we pull in vector_types.h.
91 __attribute__((device)) operator dim3() const;
92 private:
93 __CUDA_DISALLOW_BUILTINVAR_ACCESS(__cuda_builtin_gridDim_t);
94 };
95
96 #define __CUDA_BUILTIN_VAR \
97 extern const __attribute__((device)) __attribute__((weak))
98 __CUDA_BUILTIN_VAR __cuda_builtin_threadIdx_t threadIdx;
99 __CUDA_BUILTIN_VAR __cuda_builtin_blockIdx_t blockIdx;
100 __CUDA_BUILTIN_VAR __cuda_builtin_blockDim_t blockDim;
101 __CUDA_BUILTIN_VAR __cuda_builtin_gridDim_t gridDim;
102
103 // warpSize should translate to read of %WARP_SZ but there's currently no
104 // builtin to do so. According to PTX v4.2 docs 'to date, all target
105 // architectures have a WARP_SZ value of 32'.
106 __attribute__((device)) const int warpSize = 32;
107
108 #undef __CUDA_DEVICE_BUILTIN
109 #undef __CUDA_BUILTIN_VAR
110 #undef __CUDA_DISALLOW_BUILTINVAR_ACCESS
111
112 #endif /* __CUDA_BUILTIN_VARS_H */