xref: /qemu/target/arm/tcg/vfp.decode (revision d4893b01d23060845ee3855bc96626e16aad9ab5)

# AArch32 VFP instruction descriptions (conditional insns)
#
#  Copyright (c) 2019 Linaro, Ltd
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <http://www.gnu.org/licenses/>.

#
# This file is processed by scripts/decodetree.py
#
# Encodings for the conditional VFP instructions are here:
# generally anything matching A32
#  cccc 11.. .... .... .... 101. .... ....
# and T32
#  1110 110. .... .... .... 101. .... ....
#  1110 1110 .... .... .... 101. .... ....
# (but those patterns might also cover some Neon instructions,
# which do not live in this file.)

# VFP registers have an odd encoding with a four-bit field
# and a one-bit field which are assembled in different orders
# depending on whether the register is double or single precision.
# Each individual instruction function must do the checks for
# "double register selected but CPU does not have double support"
# and "double register number has bit 4 set but CPU does not
# support D16-D31" (which should UNDEF).
%vm_dp  5:1 0:4
%vm_sp  0:4 5:1
%vn_dp  7:1 16:4
%vn_sp  16:4 7:1
%vd_dp  22:1 12:4
%vd_sp  12:4 22:1

%vmov_idx_b     21:1 5:2
%vmov_idx_h     21:1 6:1

# VMOV scalar to general-purpose register; note that this does
# include some Neon cases.
VMOV_to_gp   ---- 1110 u:1 1.        1 .... rt:4 1011 ... 1 0000 \
             vn=%vn_dp size=0 index=%vmov_idx_b
VMOV_to_gp   ---- 1110 u:1 0.        1 .... rt:4 1011 ..1 1 0000 \
             vn=%vn_dp size=1 index=%vmov_idx_h
VMOV_to_gp   ---- 1110 0   0 index:1 1 .... rt:4 1011 .00 1 0000 \
             vn=%vn_dp size=2 u=0

VMOV_from_gp ---- 1110 0 1.        0 .... rt:4 1011 ... 1 0000 \
             vn=%vn_dp size=0 index=%vmov_idx_b
VMOV_from_gp ---- 1110 0 0.        0 .... rt:4 1011 ..1 1 0000 \
             vn=%vn_dp size=1 index=%vmov_idx_h
VMOV_from_gp ---- 1110 0 0 index:1 0 .... rt:4 1011 .00 1 0000 \
             vn=%vn_dp size=2

VDUP         ---- 1110 1 b:1 q:1 0 .... rt:4 1011 . 0 e:1 1 0000 \
             vn=%vn_dp

VMSR_VMRS    ---- 1110 111 l:1 reg:4 rt:4 1010 0001 0000
VMOV_single  ---- 1110 000 l:1 .... rt:4 1010 . 001 0000 \
             vn=%vn_sp

VMOV_64_sp   ---- 1100 010 op:1 rt2:4 rt:4 1010 00.1 .... \
             vm=%vm_sp
VMOV_64_dp   ---- 1100 010 op:1 rt2:4 rt:4 1011 00.1 .... \
             vm=%vm_dp

# Note that the half-precision variants of VLDR and VSTR are
# not part of this decodetree at all because they have bits [9:8] == 0b01
VLDR_VSTR_sp ---- 1101 u:1 .0 l:1 rn:4 .... 1010 imm:8 \
             vd=%vd_sp
VLDR_VSTR_dp ---- 1101 u:1 .0 l:1 rn:4 .... 1011 imm:8 \
             vd=%vd_dp

# We split the load/store multiple up into two patterns to avoid
# overlap with other insns in the "Advanced SIMD load/store and 64-bit move"
# grouping:
#   P=0 U=0 W=0 is 64-bit VMOV
#   P=1 W=0 is VLDR/VSTR
#   P=U W=1 is UNDEF
# leaving P=0 U=1 W=x and P=1 U=0 W=1 for load/store multiple.
# These include FSTM/FLDM.
VLDM_VSTM_sp ---- 1100 1 . w:1 l:1 rn:4 .... 1010 imm:8 \
             vd=%vd_sp p=0 u=1
VLDM_VSTM_dp ---- 1100 1 . w:1 l:1 rn:4 .... 1011 imm:8 \
             vd=%vd_dp p=0 u=1

VLDM_VSTM_sp ---- 1101 0.1 l:1 rn:4 .... 1010 imm:8 \
             vd=%vd_sp p=1 u=0 w=1
VLDM_VSTM_dp ---- 1101 0.1 l:1 rn:4 .... 1011 imm:8 \
             vd=%vd_dp p=1 u=0 w=1

# 3-register VFP data-processing; bits [23,21:20,6] identify the operation.
VMLA_sp      ---- 1110 0.00 .... .... 1010 .0.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMLA_dp      ---- 1110 0.00 .... .... 1011 .0.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VMLS_sp      ---- 1110 0.00 .... .... 1010 .1.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMLS_dp      ---- 1110 0.00 .... .... 1011 .1.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VNMLS_sp     ---- 1110 0.01 .... .... 1010 .0.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMLS_dp     ---- 1110 0.01 .... .... 1011 .0.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VNMLA_sp     ---- 1110 0.01 .... .... 1010 .1.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMLA_dp     ---- 1110 0.01 .... .... 1011 .1.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VMUL_sp      ---- 1110 0.10 .... .... 1010 .0.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VMUL_dp      ---- 1110 0.10 .... .... 1011 .0.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VNMUL_sp     ---- 1110 0.10 .... .... 1010 .1.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VNMUL_dp     ---- 1110 0.10 .... .... 1011 .1.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VADD_sp      ---- 1110 0.11 .... .... 1010 .0.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VADD_dp      ---- 1110 0.11 .... .... 1011 .0.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VSUB_sp      ---- 1110 0.11 .... .... 1010 .1.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VSUB_dp      ---- 1110 0.11 .... .... 1011 .1.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VDIV_sp      ---- 1110 1.00 .... .... 1010 .0.0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp
VDIV_dp      ---- 1110 1.00 .... .... 1011 .0.0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp

VFM_sp       ---- 1110 1.01 .... .... 1010 . o2:1 . 0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp o1=1
VFM_dp       ---- 1110 1.01 .... .... 1011 . o2:1 . 0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp o1=1
VFM_sp       ---- 1110 1.10 .... .... 1010 . o2:1 . 0 .... \
             vm=%vm_sp vn=%vn_sp vd=%vd_sp o1=2
VFM_dp       ---- 1110 1.10 .... .... 1011 . o2:1 . 0 .... \
             vm=%vm_dp vn=%vn_dp vd=%vd_dp o1=2