xref: /aosp_15_r20/external/XNNPACK/src/f16-gemm/gen/4x8-minmax-aarch64-neonfp16arith-ld64.S (revision 4bdc94577ba0e567308109d787f7fec7b531ce36)

// Auto-generated file. Do not edit!
//   Template: src/f16-gemm/4x8-aarch64-neonfp16arith-ld64.S.in
//   Generator: tools/xngen
//
// Copyright 2020 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

#include <xnnpack/assembly.h>

# void xnn_f16_gemm_minmax_ukernel_4x8__aarch64_neonfp16arith_ld64(
#     size_t mr,                x0
#     size_t nc,                x1
#     size_t kc,                x2 / x0
#     const void*restrict a,    x3
#     size_t a_stride,          x4
#     const void*restrict w,    x5
#     void*restrict c,          x6
#     size_t cm_stride,         x7
#     size_t cn_stride,         [sp] -> x14
#     const union xnn_f16_minmax_params params[restrict XNN_MIN_ELEMENTS(1)])  [sp + 8] -> (x8)

# d8-d15, x19-x30 need to be preserved if used. x18 is reserved by the OS.

# A pointers
# x3  a0
# x11 a1
# x12 a2
# x4  a3 / a_stride

# C pointers
# x6  c0
# x9  c1
# x10 c2
# x7  c3 / cm_stride

# Vector register usage
# A0   v0
# A1   v1
# A2   v2
# A3   v3
# B   v20 v21 v22 v23
# C   v24
# C   v26
# C   v28
# C   v30

# Clamp v4, v5
# unused A   v6, v7 v8 v9 v10 v11
# unused B   v27

BEGIN_FUNCTION xnn_f16_gemm_minmax_ukernel_4x8__aarch64_neonfp16arith_ld64

        # Load cn_stride, params pointer
        LDP     x14, x8, [sp]

        # Load params values
        LD2R    {v4.8h, v5.8h}, [x8]

        # Clamp A and C pointers
        CMP     x0, 2                   // if mr < 2
        ADD     x11, x3, x4             // a1 = a0 + a_stride
        ADD     x9, x6, x7              // c1 = c0 + cm_stride
        CSEL    x11, x3, x11, LO        //   a1 = a0
        CSEL    x9, x6, x9, LO          //   c1 = c0

        ADD     x12, x11, x4            // a2 = a1 + a_stride
        ADD     x10, x9, x7             // c2 = c1 + cm_stride
                                        // if mr <= 2
        CSEL    x12, x11, x12, LS       //   a2 = a1
        CSEL    x10, x9, x10, LS        //   c2 = c1

        CMP     x0, 4                   // if mr < 4
        ADD     x4, x12, x4             // a3 = a2 + a_stride
        ADD     x7, x10, x7             // c3 = c2 + cm_stride
        CSEL    x4, x12, x4, LO         //   a3 = a2
        CSEL    x7, x10, x7, LO         //   c3 = c2

0:
        # Load initial bias from w into accumulators
        LDR     q24, [x5], 16
        MOV     v26.16b, v24.16b
        MOV     v28.16b, v24.16b
        MOV     v30.16b, v24.16b

        # Is there at least 4 halffloats (8 bytes)?
        SUBS    x0, x2, 8               // k = kc - 8
        B.LO    3f

        # Main loop - 4 halffloats of A (8 bytes)
1:
        LDR     d0,  [x3], 8
        LDR     q20,  [x5], 16
        LDR     q21,  [x5], 16
        LDR     d1, [x11], 8
        LDR     d2, [x12], 8
        LDR     d3,  [x4], 8
        LDR     q22, [x5], 16
        LDR     q23, [x5], 16
        SUBS    x0, x0, 8
        FMLA    v24.8h, v20.8h, v0.h[0]
        FMLA    v26.8h, v20.8h, v1.h[0]
        FMLA    v28.8h, v20.8h, v2.h[0]
        FMLA    v30.8h, v20.8h, v3.h[0]
        FMLA    v24.8h, v21.8h, v0.h[1]
        FMLA    v26.8h, v21.8h, v1.h[1]
        FMLA    v28.8h, v21.8h, v2.h[1]
        FMLA    v30.8h, v21.8h, v3.h[1]

        FMLA    v24.8h, v22.8h, v0.h[2]
        FMLA    v26.8h, v22.8h, v1.h[2]
        FMLA    v28.8h, v22.8h, v2.h[2]
        FMLA    v30.8h, v22.8h, v3.h[2]
        FMLA    v24.8h, v23.8h, v0.h[3]
        FMLA    v26.8h, v23.8h, v1.h[3]
        FMLA    v28.8h, v23.8h, v2.h[3]
        FMLA    v30.8h, v23.8h, v3.h[3]
        B.HS    1b

        # Is there a remainder?- 2 halffloats of A (4 bytes)
        TBNZ    x0, 2, 4f
        # Is there a remainder?- 1 halffloat of A (2 bytes)
        TBNZ    x0, 1, 5f
2:
        # Clamp
        FMAX    v24.8h, v24.8h, v4.8h
        SUBS    x1, x1, 8
        FMAX    v26.8h, v26.8h, v4.8h
        FMAX    v28.8h, v28.8h, v4.8h
        FMAX    v30.8h, v30.8h, v4.8h
        FMIN    v24.8h, v24.8h, v5.8h
        FMIN    v26.8h, v26.8h, v5.8h
        FMIN    v28.8h, v28.8h, v5.8h
        FMIN    v30.8h, v30.8h, v5.8h

        # Store full 4 x 8
        B.LO    6f

        ST1     {v24.16b},  [x6], x14
        SUB     x3,  x3, x2             // a0 -= kc
        ST1     {v26.16b},  [x9], x14
        SUB     x11, x11, x2            // a1 -= kc
        ST1     {v28.16b}, [x10], x14
        SUB     x12, x12, x2            // a2 -= kc
        ST1     {v30.16b},  [x7], x14
        SUB     x4,  x4, x2             // a3 -= kc

        B.HI    0b
        RET

3:
        TBZ     x0, 2, 5f
4:
        # Remainder- 2 halffloats of A (4 bytes)
        LDR     s0,  [x3], 4
        LDR     q20, [x5], 16
        LDR     q21, [x5], 16
        LDR     s1, [x11], 4
        LDR     s2, [x12], 4
        LDR     s3,  [x4], 4

        FMLA    v24.8h, v20.8h, v0.h[0]
        FMLA    v26.8h, v20.8h, v1.h[0]
        FMLA    v28.8h, v20.8h, v2.h[0]
        FMLA    v30.8h, v20.8h, v3.h[0]

        FMLA    v24.8h, v21.8h, v0.h[1]
        FMLA    v26.8h, v21.8h, v1.h[1]
        FMLA    v28.8h, v21.8h, v2.h[1]
        FMLA    v30.8h, v21.8h, v3.h[1]
        TBZ     x0, 1, 2b

5:
        # Remainder- 1 halffloat of A (2 bytes)
        LDR     h0,  [x3], 2
        LDR     q20, [x5], 16
        LDR     h1, [x11], 2
        LDR     h2, [x12], 2
        LDR     h3 , [x4], 2
        FMLA    v24.8h, v20.8h, v0.h[0]
        FMLA    v26.8h, v20.8h, v1.h[0]
        FMLA    v28.8h, v20.8h, v2.h[0]
        FMLA    v30.8h, v20.8h, v3.h[0]
        B       2b

        # Store odd width
6:
        TBZ     x1, 2, 7f
        STR     d24, [x6], 8
        STR     d26, [x9], 8
        DUP     d24, v24.d[1]
        DUP     d26, v26.d[1]
        STR     d28, [x10], 8
        STR     d30, [x7], 8
        DUP     d28, v28.d[1]
        DUP     d30, v30.d[1]

7:
        TBZ     x1, 1, 8f
        STR     s24,  [x6], 4
        STR     s26,  [x9], 4
        DUP     s24, v24.s[1]
        DUP     s26, v26.s[1]
        STR     s28, [x10], 4
        STR     s30,  [x7], 4
        DUP     s28, v28.s[1]
        DUP     s30, v30.s[1]

8:
        TBZ     x1, 0, 9f
        STR     h24,  [x6]
        STR     h26,  [x9]
        STR     h28, [x10]
        STR     h30,  [x7]
9:
        RET

END_FUNCTION xnn_f16_gemm_minmax_ukernel_4x8__aarch64_neonfp16arith_ld64

#ifdef __ELF__
.section ".note.GNU-stack","",%progbits
#endif