Frank Barchard | bddfbcd | 2020-04-15 12:32:41 -0700 | [diff] [blame^] | 1 | // Copyright 2020 Google LLC |
| 2 | // |
| 3 | // This source code is licensed under the BSD-style license found in the |
| 4 | // LICENSE file in the root directory of this source tree. |
| 5 | |
| 6 | #include <xnnpack/assembly.h> |
| 7 | |
| 8 | # void xnn_f16_gemm${"inc" if INC else ""}_minmax_ukernel_1x8__aarch64_neonfp16arith_ld64( |
| 9 | # size_t mr, (x0) - unused. mr = 1 |
| 10 | # size_t nc, x1 |
| 11 | # size_t kc, x2 / x0 |
| 12 | # const uint8_t*restrict a, x3 |
| 13 | # size_t a_stride, (x4) - unused |
| 14 | # const void*restrict w, x5 |
| 15 | # uint8_t*restrict c, x6 |
| 16 | # size_t cm_stride, (x7) - unused |
| 17 | # size_t cn_stride, [sp] -> x14 |
| 18 | $if INC: |
| 19 | # const float*restrict acc, [sp + 8] -> x15 |
| 20 | # const union xnn_f16_minmax_params params[restrict static 1]) [sp + 16] -> x8 |
| 21 | $else: |
| 22 | # const union xnn_f16_minmax_params params[restrict static 1]) [sp + 8] -> x8 |
| 23 | |
| 24 | # d8-d15 need to be preserved if used. |
| 25 | # x19-30 need to be preserved if used. |
| 26 | |
| 27 | # A pointer |
| 28 | # x3 a0 |
| 29 | |
| 30 | # C pointer |
| 31 | # x6 c0 |
| 32 | |
| 33 | # Vector register usage |
| 34 | # A0 v0 v1 |
| 35 | # B v20 v21 v22 v23 |
| 36 | # C v16 v18 |
| 37 | # Clamp v4, v5, v6 |
| 38 | # Clamp v4, v5, v6 |
| 39 | |
| 40 | |
| 41 | BEGIN_FUNCTION xnn_f16_gemm${"inc" if INC else ""}_minmax_ukernel_1x8__aarch64_neonfp16arith_ld64 |
| 42 | |
| 43 | $if INC: |
| 44 | # Load cn_stride, acc |
| 45 | LDP x14, x15, [sp] |
| 46 | # Load params pointer |
| 47 | LDR x8, [sp, 16] |
| 48 | $else: |
| 49 | # Load cn_stride, params pointer |
| 50 | LDP x14, x8, [sp] |
| 51 | |
| 52 | # Load params values |
| 53 | LD3R {v4.8h, v5.8h, v6.8h}, [x8] |
| 54 | 0: |
| 55 | $if INC: |
| 56 | # Load initial accumulators |
| 57 | LDR q16, [x15], 16 |
| 58 | $else: |
| 59 | # Load initial bias from w into accumulators |
| 60 | LDR q16, [x5], 16 |
| 61 | |
| 62 | MOVI v18.8h, 0 // second set of C for pipelining FMLA |
| 63 | |
| 64 | # Is there at least 4 halffloats (8 bytes) |
| 65 | SUBS x0, x2, 8 // k = kc - 8 |
| 66 | |
| 67 | B.LO 6f |
| 68 | |
| 69 | # Main loop - 4 halffloats of A (8 bytes) |
| 70 | 1: |
| 71 | LDR d0, [x3], 8 |
| 72 | LDP q20, q21, [x5], 32 |
| 73 | LDP q22, q23, [x5], 32 |
| 74 | SUBS x0, x0, 8 |
| 75 | FMLA v16.8h, v20.8h, v0.h[0] |
| 76 | FMLA v18.8h, v21.8h, v0.h[1] |
| 77 | FMLA v16.8h, v22.8h, v0.h[2] |
| 78 | FMLA v18.8h, v23.8h, v0.h[3] |
| 79 | B.HS 1b |
| 80 | |
| 81 | # Is there a remainder?- 2 halffloats of A (4 bytes) |
| 82 | TBNZ x0, 2, 7f |
| 83 | # Is there a remainder?- 1 halffloats of A (2 bytes) |
| 84 | TBNZ x0, 1, 8f |
| 85 | |
| 86 | 4: |
| 87 | FADD v16.8h, v16.8h, v18.8h |
| 88 | SUBS x1, x1, 8 |
| 89 | |
| 90 | # Scale and Clamp |
| 91 | FMUL v16.8h, v16.8h, v4.8h |
| 92 | FMAX v16.8h, v16.8h, v5.8h |
| 93 | FMIN v16.8h, v16.8h, v6.8h |
| 94 | |
| 95 | # Store full 1 x 8 |
| 96 | B.LO 10f |
| 97 | |
| 98 | ST1 {v16.16b}, [x6], x14 |
| 99 | SUB x3, x3, x2 // a0 -= kc |
| 100 | |
| 101 | B.HI 0b |
| 102 | RET |
| 103 | |
| 104 | 6: |
| 105 | TBZ x0, 2, 8f |
| 106 | 7: |
| 107 | # Remainder- 2 halffloats of A (4 bytes) |
| 108 | LDR s0, [x3], 4 |
| 109 | LDP q20, q21, [x5], 32 |
| 110 | FMLA v16.8h, v20.8h, v0.h[0] |
| 111 | FMLA v18.8h, v21.8h, v0.h[1] |
| 112 | TBZ x0, 1, 4b |
| 113 | |
| 114 | 8: |
| 115 | # Remainder- 1 halffloat of A (2 bytes) |
| 116 | LDR h0, [x3], 2 |
| 117 | LDR q20, [x5], 16 |
| 118 | FMLA v16.8h, v20.8h, v0.h[0] |
| 119 | B 4b |
| 120 | |
| 121 | # Store odd channels |
| 122 | 10: |
| 123 | TBZ x1, 2, 11f |
| 124 | STR d16, [x6], 8 |
| 125 | DUP d16, v16.d[1] |
| 126 | |
| 127 | 11: |
| 128 | TBZ x1, 1, 12f |
| 129 | STR s16, [x6], 4 |
| 130 | DUP s16, v16.s[1] |
| 131 | |
| 132 | 12: |
| 133 | TBZ x1, 0, 13f |
| 134 | STR h16, [x6] |
| 135 | 13: |
| 136 | RET |
| 137 | |
| 138 | END_FUNCTION xnn_f16_gemm${"inc" if INC else ""}_minmax_ukernel_1x8__aarch64_neonfp16arith_ld64 |
| 139 | |
| 140 | #ifdef __ELF__ |
| 141 | .section ".note.GNU-stack","",%progbits |
| 142 | #endif |