Compute Library
 21.11
cvt.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2020 Arm Limited.
3  *
4  * SPDX-License-Identifier: MIT
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in all
14  * copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22  * SOFTWARE.
23  */
24 #ifndef ARM_COMPUTE_WRAPPER_CVT_H
25 #define ARM_COMPUTE_WRAPPER_CVT_H
26 
27 #include <arm_neon.h>
28 
29 namespace arm_compute
30 {
31 namespace wrapper
32 {
33 #define VCVT_TO_F32_IMPL(ptype, vtype, prefix, postfix1, postfix2) \
34  template <typename T> \
35  inline typename std::enable_if<std::is_same<T, float>::value, float32x4_t>::type \
36  vcvt(const vtype &a) \
37  { \
38  return prefix##_##postfix1##_##postfix2(a); \
39  }
40 
41 VCVT_TO_F32_IMPL(float32x4_t, uint32x4_t, vcvtq, f32, u32)
42 VCVT_TO_F32_IMPL(float32x4_t, int32x4_t, vcvtq, f32, s32)
43 #ifdef __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
44 VCVT_TO_F32_IMPL(float32x4_t, float16x4_t, vcvt, f32, f16)
45 #endif // __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
46 #undef VCVT_TO_F32_IMPL
47 
48 #ifdef __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
49 #define VCVT_TO_F16_IMPL(ptype, vtype, prefix, postfix1, postfix2) \
50  template <typename T> \
51  inline typename std::enable_if<std::is_same<T, float16_t>::value, float16x4_t>::type \
52  vcvt(const vtype &a) \
53  { \
54  return prefix##_##postfix1##_##postfix2(a); \
55  }
56 
57 VCVT_TO_F16_IMPL(float16x4_t, float32x4_t, vcvt, f16, f32)
58 #undef VCVT_TO_F16_IMPL
59 #endif // __ARM_FEATURE_FP16_VECTOR_ARITHMETIC
60 
61 template <typename T>
62 inline typename std::enable_if<std::is_same<T, uint8_t>::value, uint32x4_t>::type
63 vcvt(const float32x4_t &a)
64 {
65  return vcvtq_u32_f32(a);
66 }
67 
68 template <typename T>
69 inline typename std::enable_if<std::is_same<T, int8_t>::value, int32x4_t>::type
70 vcvt(const float32x4_t &a)
71 {
72  return vcvtq_s32_f32(a);
73 }
74 
75 #if defined(__ARM_FEATURE_BF16_VECTOR_ARITHMETIC) || defined(ARM_COMPUTE_FORCE_BF16)
76 /** Convert 2x128-bit floating point vectors into 1x128-bit bfloat16 vector
77  *
78  * @param[in] inptr Pointer to the input memory to load values from
79  * @param[in,out] outptr Pointer to the output memory to store values to
80  */
81 inline void vcvt_bf16_f32(const float *inptr, uint16_t *outptr)
82 {
83  __asm __volatile(
84  "ldp q0, q1, [%[inptr]]\n"
85  ".inst 0xea16800\n" // BFCVTN v0, v0
86  ".inst 0x4ea16820\n" // BFCVTN2 v0, v1
87  "str q0, [%[outptr]]\n"
88  : [inptr] "+r"(inptr)
89  : [outptr] "r"(outptr)
90  : "v0", "v1", "memory");
91 }
92 #endif /* defined(__ARM_FEATURE_BF16_VECTOR_ARITHMETIC) || defined(ARM_COMPUTE_FORCE_BF16) */
93 
94 } // namespace wrapper
95 } // namespace arm_compute
96 #endif /* ARM_COMPUTE_WRAPPER_CVT_H */
std::enable_if< std::is_same< T, float >::value, float32x4_t >::type vcvt(const uint32x4_t &a)
Definition: cvt.h:41
#define VCVT_TO_F32_IMPL(ptype, vtype, prefix, postfix1, postfix2)
Definition: cvt.h:33
decltype(strategy::transforms) typedef type
Copyright (c) 2017-2021 Arm Limited.