xref: /qemu/target/arm/tcg/vfp.decode (revision 3a98ac40fa9fca85bb37f4281e872b7519e733c5)

# 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 2.1 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_imm 16:4 0:4

@vfp_dnm_s   ................................ vm=%vm_sp vn=%vn_sp vd=%vd_sp
@vfp_dnm_d   ................................ vm=%vm_dp vn=%vn_dp vd=%vd_dp

@vfp_dm_ss   ................................ vm=%vm_sp vd=%vd_sp
@vfp_dm_dd   ................................ vm=%vm_dp vd=%vd_dp
@vfp_dm_ds   ................................ vm=%vm_sp vd=%vd_dp
@vfp_dm_sd   ................................ vm=%vm_dp vd=%vd_sp

# 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_half    ---- 1110 000 l:1 .... rt:4 1001 . 001 0000    vn=%vn_sp
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

VLDR_VSTR_hp ---- 1101 u:1 .0 l:1 rn:4 .... 1001 imm:8      vd=%vd_sp
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

# M-profile VLDR/VSTR to sysreg
%vldr_sysreg 22:1 13:3
%imm7_0x4 0:7 !function=times_4

&vldr_sysreg rn reg imm a w p
@vldr_sysreg .... ... . a:1 . . . rn:4 ... . ... .. ....... \
             reg=%vldr_sysreg imm=%imm7_0x4 &vldr_sysreg

# P=0 W=0 is SEE "Related encodings", so split into two patterns
VLDR_sysreg  ---- 110 1 . . w:1 1 .... ... 0 111 11 ....... @vldr_sysreg p=1
VLDR_sysreg  ---- 110 0 . . 1   1 .... ... 0 111 11 ....... @vldr_sysreg p=0 w=1
VSTR_sysreg  ---- 110 1 . . w:1 0 .... ... 0 111 11 ....... @vldr_sysreg p=1
VSTR_sysreg  ---- 110 0 . . 1   0 .... ... 0 111 11 ....... @vldr_sysreg p=0 w=1

# 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_hp      ---- 1110 0.00 .... .... 1001 .0.0 ....        @vfp_dnm_s
VMLA_sp      ---- 1110 0.00 .... .... 1010 .0.0 ....        @vfp_dnm_s
VMLA_dp      ---- 1110 0.00 .... .... 1011 .0.0 ....        @vfp_dnm_d

VMLS_hp      ---- 1110 0.00 .... .... 1001 .1.0 ....        @vfp_dnm_s
VMLS_sp      ---- 1110 0.00 .... .... 1010 .1.0 ....        @vfp_dnm_s
VMLS_dp      ---- 1110 0.00 .... .... 1011 .1.0 ....        @vfp_dnm_d

VNMLS_hp     ---- 1110 0.01 .... .... 1001 .0.0 ....        @vfp_dnm_s
VNMLS_sp     ---- 1110 0.01 .... .... 1010 .0.0 ....        @vfp_dnm_s
VNMLS_dp     ---- 1110 0.01 .... .... 1011 .0.0 ....        @vfp_dnm_d

VNMLA_hp     ---- 1110 0.01 .... .... 1001 .1.0 ....        @vfp_dnm_s
VNMLA_sp     ---- 1110 0.01 .... .... 1010 .1.0 ....        @vfp_dnm_s
VNMLA_dp     ---- 1110 0.01 .... .... 1011 .1.0 ....        @vfp_dnm_d

VMUL_hp      ---- 1110 0.10 .... .... 1001 .0.0 ....        @vfp_dnm_s
VMUL_sp      ---- 1110 0.10 .... .... 1010 .0.0 ....        @vfp_dnm_s
VMUL_dp      ---- 1110 0.10 .... .... 1011 .0.0 ....        @vfp_dnm_d

VNMUL_hp     ---- 1110 0.10 .... .... 1001 .1.0 ....        @vfp_dnm_s
VNMUL_sp     ---- 1110 0.10 .... .... 1010 .1.0 ....        @vfp_dnm_s
VNMUL_dp     ---- 1110 0.10 .... .... 1011 .1.0 ....        @vfp_dnm_d

VADD_hp      ---- 1110 0.11 .... .... 1001 .0.0 ....        @vfp_dnm_s
VADD_sp      ---- 1110 0.11 .... .... 1010 .0.0 ....        @vfp_dnm_s
VADD_dp      ---- 1110 0.11 .... .... 1011 .0.0 ....        @vfp_dnm_d

VSUB_hp      ---- 1110 0.11 .... .... 1001 .1.0 ....        @vfp_dnm_s
VSUB_sp      ---- 1110 0.11 .... .... 1010 .1.0 ....        @vfp_dnm_s
VSUB_dp      ---- 1110 0.11 .... .... 1011 .1.0 ....        @vfp_dnm_d

VDIV_hp      ---- 1110 1.00 .... .... 1001 .0.0 ....        @vfp_dnm_s
VDIV_sp      ---- 1110 1.00 .... .... 1010 .0.0 ....        @vfp_dnm_s
VDIV_dp      ---- 1110 1.00 .... .... 1011 .0.0 ....        @vfp_dnm_d

VFMA_hp      ---- 1110 1.10 .... .... 1001 .0. 0 ....       @vfp_dnm_s
VFMS_hp      ---- 1110 1.10 .... .... 1001 .1. 0 ....       @vfp_dnm_s
VFNMA_hp     ---- 1110 1.01 .... .... 1001 .0. 0 ....       @vfp_dnm_s
VFNMS_hp     ---- 1110 1.01 .... .... 1001 .1. 0 ....       @vfp_dnm_s

VFMA_sp      ---- 1110 1.10 .... .... 1010 .0. 0 ....       @vfp_dnm_s
VFMS_sp      ---- 1110 1.10 .... .... 1010 .1. 0 ....       @vfp_dnm_s
VFNMA_sp     ---- 1110 1.01 .... .... 1010 .0. 0 ....       @vfp_dnm_s
VFNMS_sp     ---- 1110 1.01 .... .... 1010 .1. 0 ....       @vfp_dnm_s

VFMA_dp      ---- 1110 1.10 .... .... 1011 .0.0 ....        @vfp_dnm_d
VFMS_dp      ---- 1110 1.10 .... .... 1011 .1.0 ....        @vfp_dnm_d
VFNMA_dp     ---- 1110 1.01 .... .... 1011 .0.0 ....        @vfp_dnm_d
VFNMS_dp     ---- 1110 1.01 .... .... 1011 .1.0 ....        @vfp_dnm_d

VMOV_imm_hp  ---- 1110 1.11 .... .... 1001 0000 .... \
             vd=%vd_sp imm=%vmov_imm
VMOV_imm_sp  ---- 1110 1.11 .... .... 1010 0000 .... \
             vd=%vd_sp imm=%vmov_imm
VMOV_imm_dp  ---- 1110 1.11 .... .... 1011 0000 .... \
             vd=%vd_dp imm=%vmov_imm

VMOV_reg_sp  ---- 1110 1.11 0000 .... 1010 01.0 ....        @vfp_dm_ss
VMOV_reg_dp  ---- 1110 1.11 0000 .... 1011 01.0 ....        @vfp_dm_dd

VABS_hp      ---- 1110 1.11 0000 .... 1001 11.0 ....        @vfp_dm_ss
VABS_sp      ---- 1110 1.11 0000 .... 1010 11.0 ....        @vfp_dm_ss
VABS_dp      ---- 1110 1.11 0000 .... 1011 11.0 ....        @vfp_dm_dd

VNEG_hp      ---- 1110 1.11 0001 .... 1001 01.0 ....        @vfp_dm_ss
VNEG_sp      ---- 1110 1.11 0001 .... 1010 01.0 ....        @vfp_dm_ss
VNEG_dp      ---- 1110 1.11 0001 .... 1011 01.0 ....        @vfp_dm_dd

VSQRT_hp     ---- 1110 1.11 0001 .... 1001 11.0 ....        @vfp_dm_ss
VSQRT_sp     ---- 1110 1.11 0001 .... 1010 11.0 ....        @vfp_dm_ss
VSQRT_dp     ---- 1110 1.11 0001 .... 1011 11.0 ....        @vfp_dm_dd

VCMP_hp      ---- 1110 1.11 010 z:1 .... 1001 e:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCMP_sp      ---- 1110 1.11 010 z:1 .... 1010 e:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCMP_dp      ---- 1110 1.11 010 z:1 .... 1011 e:1 1.0 .... \
             vd=%vd_dp vm=%vm_dp

# VCVTT and VCVTB from f16: Vd format depends on size bit; Vm is always vm_sp
VCVT_f32_f16 ---- 1110 1.11 0010 .... 1010 t:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_f64_f16 ---- 1110 1.11 0010 .... 1011 t:1 1.0 .... \
             vd=%vd_dp vm=%vm_sp

# VCVTB and VCVTT to f16: Vd format is always vd_sp;
# Vm format depends on size bit
VCVT_b16_f32 ---- 1110 1.11 0011 .... 1001 t:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_f16_f32 ---- 1110 1.11 0011 .... 1010 t:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_f16_f64 ---- 1110 1.11 0011 .... 1011 t:1 1.0 .... \
             vd=%vd_sp vm=%vm_dp

VRINTR_hp    ---- 1110 1.11 0110 .... 1001 01.0 ....        @vfp_dm_ss
VRINTR_sp    ---- 1110 1.11 0110 .... 1010 01.0 ....        @vfp_dm_ss
VRINTR_dp    ---- 1110 1.11 0110 .... 1011 01.0 ....        @vfp_dm_dd

VRINTZ_hp    ---- 1110 1.11 0110 .... 1001 11.0 ....        @vfp_dm_ss
VRINTZ_sp    ---- 1110 1.11 0110 .... 1010 11.0 ....        @vfp_dm_ss
VRINTZ_dp    ---- 1110 1.11 0110 .... 1011 11.0 ....        @vfp_dm_dd

VRINTX_hp    ---- 1110 1.11 0111 .... 1001 01.0 ....        @vfp_dm_ss
VRINTX_sp    ---- 1110 1.11 0111 .... 1010 01.0 ....        @vfp_dm_ss
VRINTX_dp    ---- 1110 1.11 0111 .... 1011 01.0 ....        @vfp_dm_dd

# VCVT between single and double:
# Vm precision depends on size; Vd is its reverse
VCVT_sp      ---- 1110 1.11 0111 .... 1010 11.0 ....        @vfp_dm_ds
VCVT_dp      ---- 1110 1.11 0111 .... 1011 11.0 ....        @vfp_dm_sd

# VCVT from integer to floating point: Vm always single; Vd depends on size
VCVT_int_hp  ---- 1110 1.11 1000 .... 1001 s:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_int_sp  ---- 1110 1.11 1000 .... 1010 s:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_int_dp  ---- 1110 1.11 1000 .... 1011 s:1 1.0 .... \
             vd=%vd_dp vm=%vm_sp

# VJCVT is always dp to sp
VJCVT        ---- 1110 1.11 1001 .... 1011 11.0 ....        @vfp_dm_sd

# VCVT between floating-point and fixed-point. The immediate value
# is in the same format as a Vm single-precision register number.
# We assemble bits 18 (op), 16 (u) and 7 (sx) into a single opc field
# for the convenience of the trans_VCVT_fix functions.
%vcvt_fix_op 18:1 16:1 7:1
VCVT_fix_hp  ---- 1110 1.11 1.1. .... 1001 .1.0 .... \
             vd=%vd_sp imm=%vm_sp opc=%vcvt_fix_op
VCVT_fix_sp  ---- 1110 1.11 1.1. .... 1010 .1.0 .... \
             vd=%vd_sp imm=%vm_sp opc=%vcvt_fix_op
VCVT_fix_dp  ---- 1110 1.11 1.1. .... 1011 .1.0 .... \
             vd=%vd_dp imm=%vm_sp opc=%vcvt_fix_op

# VCVT float to integer (VCVT and VCVTR): Vd always single; Vd depends on size
VCVT_hp_int  ---- 1110 1.11 110 s:1 .... 1001 rz:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_sp_int  ---- 1110 1.11 110 s:1 .... 1010 rz:1 1.0 .... \
             vd=%vd_sp vm=%vm_sp
VCVT_dp_int  ---- 1110 1.11 110 s:1 .... 1011 rz:1 1.0 .... \
             vd=%vd_sp vm=%vm_dp