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// Copyright 2019 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_f32_gemm${"inc" if INC else ""}_minmax_ukernel_4x8__asm_aarch64_neonfma_cortex_a55(
# size_t mr, x0
# size_t nc, x1
# size_t kc, x2 / x0
# const float* a, x3
# size_t a_stride, x4
# const float* w, x5
# float* c, x6
# size_t cm_stride, x7
# size_t cn_stride, [sp] -> (x0)
$if INC:
# const float* acc, [sp + 8] -> x15
# const xnn_f32_minmax_params* params) [sp + 16] -> (x8)
$else:
# const xnn_f32_minmax_params* params) [sp + 8] -> (x8)
# d8-d15, x19-x30 need to be preserved if used. x18 is reserved by the OS.
# Vector register usage
# A0 x3 v0 v3
# A1 x9 v0[1] v3[1]
# A2 x10 v1 v4
# A3 x11 v1[1] v4[1]
# B x5 v12 v13 v14 v15 second set of B
# B v16 v17 v18 v19 first set
# C x6 v20 v21
# C x16 v22 v23
# C x17 v24 v25
# C x14 v26 v27
# Clamp v6 v7
# temporary vector shadow register x4
# unused A v8 v9 v10 v11
# x12 a4
# x13 c4
# x7 c5
# A4 v2 v5
# A5 v2[1] v5[1]
# C v28 v29
# C v30 v31
BEGIN_FUNCTION xnn_f32_gemm${"inc" if INC else ""}_minmax_ukernel_4x8__asm_aarch64_neonfma_cortex_a55
$if INC:
# Load acc, params pointer
LDP x15, x8, [sp, 8]
$else:
# Load params pointer
LDR x8, [sp, 8]
# Clamp A and C pointers
CMP x0, 2 // if mr < 2
ADD x9, x3, x4 // a1 = a0 + a_stride
ADD x16, x6, x7 // c1 = c0 + cm_stride
CSEL x9, x3, x9, LO // a1 = a0
CSEL x16, x6, x16, LO // c1 = c0
ADD x10, x9, x4 // a2 = a1 + a_stride
ADD x17, x16, x7 // c2 = c1 + cm_stride
// if mr <= 2
CSEL x10, x9, x10, LS // a2 = a1
CSEL x17, x16, x17, LS // c2 = c1
CMP x0, 4 // if mr < 4
ADD x11, x10, x4 // a3 = a2 + a_stride
ADD x14, x17, x7 // c3 = c2 + cm_stride
CSEL x11, x10, x11, LO // a3 = a2
CSEL x14, x17, x14, LO // c3 = c2
# Load min/max values
LD2R {v6.4s, v7.4s}, [x8]
# Save d12-d15 on stack
STP d12, d13, [sp, -32]!
STP d14, d15, [sp, 16]
0:
$if INC:
# Load initial accumulators
LDP q20, q21, [x15], 32
LDP q22, q23, [x15], 32
LDP q24, q25, [x15], 32
LDP q26, q27, [x15], 32
PRFM PLDL1KEEP, [x3, 0] // Prefetch A
PRFM PLDL1KEEP, [x3, 64]
PRFM PLDL1KEEP, [x9, 0]
PRFM PLDL1KEEP, [x9, 64]
PRFM PLDL1KEEP, [x10, 0]
PRFM PLDL1KEEP, [x10, 64]
PRFM PLDL1KEEP, [x11, 0]
PRFM PLDL1KEEP, [x11, 64]
PRFM PLDL1KEEP, [x5, 0] // Prefetch B
PRFM PLDL1KEEP, [x5, 64]
PRFM PLDL1KEEP, [x5, 128]
PRFM PLDL1KEEP, [x5, 192]
$else:
# Load initial bias from w into accumulators
LDP q20, q21, [x5], 32
MOV v22.16b, v20.16b
PRFM PLDL1KEEP, [x3, 0] // Prefetch A
PRFM PLDL1KEEP, [x3, 64]
MOV v23.16b, v21.16b
PRFM PLDL1KEEP, [x9, 0]
PRFM PLDL1KEEP, [x9, 64]
MOV v24.16b, v20.16b
PRFM PLDL1KEEP, [x10, 0]
PRFM PLDL1KEEP, [x10, 64]
MOV v25.16b, v21.16b
PRFM PLDL1KEEP, [x11, 0]
PRFM PLDL1KEEP, [x11, 64]
MOV v26.16b, v20.16b
PRFM PLDL1KEEP, [x5, 0] // Prefetch B
MOV v27.16b, v21.16b
PRFM PLDL1KEEP, [x5, 64]
PRFM PLDL1KEEP, [x5, 128]
PRFM PLDL1KEEP, [x5, 192]
# Is there at least 4 floats (16 bytes) for prologue + epilogue?
SUBS x0, x2, 16 // k = kc - 16
B.LO 4f
# Prologue - First group loads, no FMA
LDR d0, [x3], 8 // a0
LDP q16, q17, [x5], 32 // b
LDR d1, [x10], 8 // a2
LD1 {v0.d}[1], [x9], 8 // a1
LD1 {v1.d}[1], [x11], 8 // a3
SUBS x0, x0, 16
LDR q18, [x5], 16
LDR d19, [x5], 8
LDR x4, [x5], 8 // ins is in BLOCK 0
# Is there at least 4 floats (16 bytes) for main loop?
B.LO 2f
# Main loop - 4 floats of A (16 bytes)
# 32 FMA + 8 LD64 A + 8 LDR B
1:
# First group of 16 FMA, Second group loads
# BLOCK 0
FMLA v20.4s, v16.4s, v0.s[0]
LDR d3, [x3], 8 // a0
FMLA v22.4s, v16.4s, v0.s[2]
INS v19.d[1], x4 // b from second group
FMLA v24.4s, v16.4s, v1.s[0]
LDR x4, [x9], 8 // a1
# BLOCK 1
FMLA v26.4s, v16.4s, v1.s[2]
LDR d12, [x5]
FMLA v21.4s, v17.4s, v0.s[0]
INS v3.d[1], x4 // a1 ins
FMLA v23.4s, v17.4s, v0.s[2]
LDR x4, [x5, 8] // b
# BLOCK 2
FMLA v25.4s, v17.4s, v1.s[0]
LDR d4, [x10], 8 // a2
FMLA v27.4s, v17.4s, v1.s[2]
INS v12.d[1], x4 // b ins
FMLA v20.4s, v18.4s, v0.s[1]
LDR x4, [x11], 8 // a3
# BLOCK 3
FMLA v22.4s, v18.4s, v0.s[3]
LDR d13, [x5, 16]
FMLA v24.4s, v18.4s, v1.s[1]
INS v4.d[1], x4 // a3 ins
FMLA v26.4s, v18.4s, v1.s[3]
LDR x4, [x5, 24]
# BLOCK 4
FMLA v21.4s, v19.4s, v0.s[1]
LDR d14, [x5, 32]
FMLA v23.4s, v19.4s, v0.s[3]
INS v13.d[1], x4 // b
FMLA v25.4s, v19.4s, v1.s[1]
LDR x4, [x5, 40]
# BLOCK 5
# NOPs to ensure 4 cycle LDR lands on next LDR
FMLA v27.4s, v19.4s, v1.s[3]
LDR d15, [x5, 48]
NOP
INS v14.d[1], x4 // b from previous
SUBS x0, x0, 16
LDR x4, [x5, 56]
# Second group of 16 FMA, First group of loads
# BLOCK 0
FMLA v20.4s, v12.4s, v3.s[0]
LDR d0, [x3], 8 // a0
FMLA v22.4s, v12.4s, v3.s[2]
INS v15.d[1], x4 // b from previous
FMLA v24.4s, v12.4s, v4.s[0]
LDR x4, [x9], 8 // a1
# BLOCK 1
FMLA v26.4s, v12.4s, v4.s[2]
LDR d16, [x5, 64]
FMLA v21.4s, v13.4s, v3.s[0]
INS v0.d[1], x4 // a1 ins
FMLA v23.4s, v13.4s, v3.s[2]
LDR x4, [x5, 72] // b
# BLOCK 2
FMLA v25.4s, v13.4s, v4.s[0]
LDR d1, [x10], 8 // a2
FMLA v27.4s, v13.4s, v4.s[2]
INS v16.d[1], x4 // b
FMLA v20.4s, v14.4s, v3.s[1]
LDR x4, [x11], 8 // a3
# BLOCK 3
FMLA v22.4s, v14.4s, v3.s[3]
LDR d17, [x5, 80]
FMLA v24.4s, v14.4s, v4.s[1]
INS v1.d[1], x4 // a3 ins
FMLA v26.4s, v14.4s, v4.s[3]
LDR x4, [x5, 88]
# BLOCK 4
FMLA v21.4s, v15.4s, v3.s[1]
LDR d18, [x5, 96]
FMLA v23.4s, v15.4s, v3.s[3]
INS v17.d[1], x4 // b
FMLA v25.4s, v15.4s, v4.s[1]
LDR x4, [x5, 104]
# BLOCK 5
# NOTE that block needs to be 4 cycles for LDR not to stall
FMLA v27.4s, v15.4s, v4.s[3]
LDR d19, [x5, 112]
INS v18.d[1], x4
LDR x4, [x5, 120]
ADD x5, x5, 128
B.HS 1b
# Epilogue - 4 floats of A (16 bytes)
# 32 FMA + 8 LD64 A + 8 LDR B
2:
# First group of 16 FMA, Second group loads
# BLOCK 0
FMLA v20.4s, v16.4s, v0.s[0]
LDR d3, [x3], 8 // a0
FMLA v22.4s, v16.4s, v0.s[2]
INS v19.d[1], x4 // b from second group
FMLA v24.4s, v16.4s, v1.s[0]
LDR x4, [x9], 8 // a1
# BLOCK 1
FMLA v26.4s, v16.4s, v1.s[2]
LDR d12, [x5]
FMLA v21.4s, v17.4s, v0.s[0]
INS v3.d[1], x4 // a1 ins
FMLA v23.4s, v17.4s, v0.s[2]
LDR x4, [x5, 8] // b
# BLOCK 2
FMLA v25.4s, v17.4s, v1.s[0]
LDR d4, [x10], 8 // a2
FMLA v27.4s, v17.4s, v1.s[2]
INS v12.d[1], x4 // b ins
FMLA v20.4s, v18.4s, v0.s[1]
LDR x4, [x11], 8 // a3
# BLOCK 3
FMLA v22.4s, v18.4s, v0.s[3]
LDR d13, [x5, 16]
FMLA v24.4s, v18.4s, v1.s[1]
INS v4.d[1], x4 // a3 ins
FMLA v26.4s, v18.4s, v1.s[3]
LDR x4, [x5, 24]
# BLOCK 4
FMLA v21.4s, v19.4s, v0.s[1]
LDR d14, [x5, 32]
FMLA v23.4s, v19.4s, v0.s[3]
INS v13.d[1], x4 // b
FMLA v25.4s, v19.4s, v1.s[1]
LDR x4, [x5, 40]
# BLOCK 5
# NOPs to ensure 4 cycle LDR lands on next LDR
FMLA v27.4s, v19.4s, v1.s[3]
LDR d15, [x5, 48]
NOP // fma
INS v14.d[1], x4
NOP
LDR x4, [x5, 56]
# Second group of 16 FMA, no loads
# BLOCK 0
FMLA v20.4s, v12.4s, v3.s[0]
FMLA v22.4s, v12.4s, v3.s[2]
INS v15.d[1], x4 // b from previous
FMLA v24.4s, v12.4s, v4.s[0]
# BLOCK 1
FMLA v26.4s, v12.4s, v4.s[2]
FMLA v21.4s, v13.4s, v3.s[0]
FMLA v23.4s, v13.4s, v3.s[2]
# BLOCK 2
FMLA v25.4s, v13.4s, v4.s[0]
FMLA v27.4s, v13.4s, v4.s[2]
FMLA v20.4s, v14.4s, v3.s[1]
# BLOCK 3
FMLA v22.4s, v14.4s, v3.s[3]
FMLA v24.4s, v14.4s, v4.s[1]
FMLA v26.4s, v14.4s, v4.s[3]
TST x0, 15
# BLOCK 4
FMLA v21.4s, v15.4s, v3.s[1]
FMLA v23.4s, v15.4s, v3.s[3]
FMLA v25.4s, v15.4s, v4.s[1]
ADD x5, x5, 64
# BLOCK 5
FMLA v27.4s, v15.4s, v4.s[3]
# Is there a remainder?- 2 floats of A (8 bytes) or less
B.NE 4f
3:
# Clamp
FMAX v20.4s, v20.4s, v6.4s
# Load cn_stride
LDR x0, [sp, 32]
FMAX v21.4s, v21.4s, v6.4s
FMAX v22.4s, v22.4s, v6.4s
FMAX v23.4s, v23.4s, v6.4s
FMAX v24.4s, v24.4s, v6.4s
FMAX v25.4s, v25.4s, v6.4s
FMAX v26.4s, v26.4s, v6.4s
FMAX v27.4s, v27.4s, v6.4s
SUBS x1, x1, 8
FMIN v20.4s, v20.4s, v7.4s
FMIN v21.4s, v21.4s, v7.4s
FMIN v22.4s, v22.4s, v7.4s
FMIN v23.4s, v23.4s, v7.4s
FMIN v24.4s, v24.4s, v7.4s
FMIN v25.4s, v25.4s, v7.4s
FMIN v26.4s, v26.4s, v7.4s
FMIN v27.4s, v27.4s, v7.4s
# Store full 4 x 8
B.LO 6f
$if INC:
ST1 {v26.16b, v27.16b}, [x14], x0
SUB x3, x3, x2 // a0 -= kc
ST1 {v24.16b, v25.16b}, [x17], x0
SUB x9, x9, x2 // a1 -= kc
ST1 {v22.16b, v23.16b}, [x16], x0
SUB x10, x10, x2 // a2 -= kc
ST1 {v20.16b, v21.16b}, [x6], x0
SUB x11, x11, x2 // a3 -= kc
$else:
ST1 {v20.16b, v21.16b}, [x6], x0
SUB x3, x3, x2 // a0 -= kc
ST1 {v22.16b, v23.16b}, [x16], x0
SUB x9, x9, x2 // a1 -= kc
ST1 {v24.16b, v25.16b}, [x17], x0
SUB x10, x10, x2 // a2 -= kc
ST1 {v26.16b, v27.16b}, [x14], x0
SUB x11, x11, x2 // a3 -= kc
B.HI 0b
# Restore d12-d15 from stack
LDP d14, d15, [sp, 16]
LDP d12, d13, [sp], 32
RET
4:
# Is there a remainder?- 2 floats of A (8 bytes)
TBZ x0, 3, 5f
# Remainder- 2 floats of A (8 bytes)
LDR d0, [x3], 8
LDR q16, [x5], 16
LD1 {v0.d}[1], [x9], 8
LDR d1, [x10], 8
LD1 {v1.d}[1], [x11], 8
LDR q17, [x5], 16
LDR q18, [x5], 16
LDR q19, [x5], 16
FMLA v20.4s, v16.4s, v0.s[0]
FMLA v22.4s, v16.4s, v0.s[2]
FMLA v24.4s, v16.4s, v1.s[0]
FMLA v26.4s, v16.4s, v1.s[2]
FMLA v21.4s, v17.4s, v0.s[0]
FMLA v23.4s, v17.4s, v0.s[2]
FMLA v25.4s, v17.4s, v1.s[0]
FMLA v27.4s, v17.4s, v1.s[2]
FMLA v20.4s, v18.4s, v0.s[1]
FMLA v22.4s, v18.4s, v0.s[3]
FMLA v24.4s, v18.4s, v1.s[1]
FMLA v26.4s, v18.4s, v1.s[3]
FMLA v21.4s, v19.4s, v0.s[1]
FMLA v23.4s, v19.4s, v0.s[3]
FMLA v25.4s, v19.4s, v1.s[1]
FMLA v27.4s, v19.4s, v1.s[3]
# Is there a remainder?- 1 float of A (4 bytes)
TBZ x0, 2, 3b
5:
# Remainder- 1 float of A (4 bytes)
LDR s0, [x3], 4
LDR q16, [x5], 16
LD1 {v0.s}[2], [x9], 4
LDR s1, [x10], 4
LD1 {v1.s}[2], [x11], 4
LDR q17, [x5], 16
FMLA v20.4s, v16.4s, v0.s[0]
FMLA v22.4s, v16.4s, v0.s[2]
FMLA v24.4s, v16.4s, v1.s[0]
FMLA v26.4s, v16.4s, v1.s[2]
FMLA v21.4s, v17.4s, v0.s[0]
FMLA v23.4s, v17.4s, v0.s[2]
FMLA v25.4s, v17.4s, v1.s[0]
FMLA v27.4s, v17.4s, v1.s[2]
B 3b
# Store odd width
6:
TBZ x1, 2, 7f
$if INC:
STR q26, [x14], 16
MOV v26.16b, v27.16b
STR q24, [x17], 16
MOV v24.16b, v25.16b
STR q22, [x16], 16
MOV v22.16b, v23.16b
STR q20, [x6], 16
MOV v20.16b, v21.16b
$else:
STR q20, [x6], 16
MOV v20.16b, v21.16b
STR q22, [x16], 16
MOV v22.16b, v23.16b
STR q24, [x17], 16
MOV v24.16b, v25.16b
STR q26, [x14], 16
MOV v26.16b, v27.16b
7:
TBZ x1, 1, 8f
$if INC:
STR d26, [x14], 8
STR d24, [x17], 8
DUP d26, v26.d[1]
DUP d24, v24.d[1]
STR d22, [x16], 8
STR d20, [x6], 8
DUP d22, v22.d[1]
DUP d20, v20.d[1]
$else:
STR d20, [x6], 8
STR d22, [x16], 8
DUP d20, v20.d[1]
DUP d22, v22.d[1]
STR d24, [x17], 8
STR d26, [x14], 8
DUP d24, v24.d[1]
DUP d26, v26.d[1]
8:
TBZ x1, 0, 9f
$if INC:
STR s26, [x14]
STR s24, [x17]
STR s22, [x16]
STR s20, [x6]
$else:
STR s20, [x6]
STR s22, [x16]
STR s24, [x17]
STR s26, [x14]
9:
# Restore d12-d15 from stack
LDP d14, d15, [sp, 16]
LDP d12, d13, [sp], 32
RET
END_FUNCTION xnn_f32_gemm${"inc" if INC else ""}_minmax_ukernel_4x8__asm_aarch64_neonfma_cortex_a55
#ifdef __ELF__
.section ".note.GNU-stack","",%progbits
#endif
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