abstractaccelerator/design/dec/decode

.definition

add =     [0000000..........000.....0110011]
addi =    [.................000.....0010011]

sub =     [0100000..........000.....0110011]

and =     [0000000..........111.....0110011]
andi =    [.................111.....0010011]

or   =    [0000000..........110.....0110011]
ori =     [.................110.....0010011]

xor =     [0000000..........100.....0110011]
xori =    [.................100.....0010011]

sll =     [0000000..........001.....0110011]
slli =    [0000000..........001.....0010011]

sra =     [0100000..........101.....0110011]
srai =    [0100000..........101.....0010011]

srl  =    [0000000..........101.....0110011]
srli =    [0000000..........101.....0010011]

lui =     [.........................0110111]
auipc=    [.........................0010111]

slt =     [0000000..........010.....0110011]
sltu =    [0000000..........011.....0110011]
slti =    [.................010.....0010011]
sltiu=    [.................011.....0010011]

beq =     [.................000.....1100011]
bne =     [.................001.....1100011]
bge =     [.................101.....1100011]
blt  =    [.................100.....1100011]
bgeu =    [.................111.....1100011]
bltu =    [.................110.....1100011]

jal =     [.........................1101111]
jalr =    [.................000.....1100111]

lb =      [.................000.....0000011]
lh =      [.................001.....0000011]
lw =      [.................010.....0000011]

sb =      [.................000.....0100011]
sh =      [.................001.....0100011]
sw =      [.................010.....0100011]

lbu =     [.................100.....0000011]
lhu =     [.................101.....0000011]

fence =   [0000........00000000000000001111]
fence.i = [00000000000000000001000000001111]

ebreak  = [00000000000100000000000001110011]
ecall  =  [00000000000000000000000001110011]

mret   =  [00110000001000000000000001110011]

wfi    =  [00010000010100000000000001110011]

csrrc_ro  =  [............00000011.....1110011]
csrrc_rw0 =  [............1....011.....1110011]
csrrc_rw1 =  [.............1...011.....1110011]
csrrc_rw2 =  [..............1..011.....1110011]
csrrc_rw3 =  [...............1.011.....1110011]
csrrc_rw4 =  [................1011.....1110011]

csrrci_ro  = [............00000111.....1110011]
csrrci_rw0 = [............1....111.....1110011]
csrrci_rw1 = [.............1...111.....1110011]
csrrci_rw2 = [..............1..111.....1110011]
csrrci_rw3 = [...............1.111.....1110011]
csrrci_rw4 = [................1111.....1110011]

csrrs_ro  =  [............00000010.....1110011]
csrrs_rw0 =  [............1....010.....1110011]
csrrs_rw1 =  [.............1...010.....1110011]
csrrs_rw2 =  [..............1..010.....1110011]
csrrs_rw3 =  [...............1.010.....1110011]
csrrs_rw4 =  [................1010.....1110011]

csrrsi_ro  = [............00000110.....1110011]
csrrsi_rw0 = [............1....110.....1110011]
csrrsi_rw1 = [.............1...110.....1110011]
csrrsi_rw2 = [..............1..110.....1110011]
csrrsi_rw3 = [...............1.110.....1110011]
csrrsi_rw4 = [................1110.....1110011]


csrw  =       [.................001000001110011]
csrrw0 =      [.................001....11110011]
csrrw1 =      [.................001...1.1110011]
csrrw2 =      [.................001..1..1110011]
csrrw3 =      [.................001.1...1110011]
csrrw4 =      [.................0011....1110011]

csrwi   =     [.................101000001110011]
csrrwi0 =     [.................101....11110011]
csrrwi1 =     [.................101...1.1110011]
csrrwi2 =     [.................101..1..1110011]
csrrwi3 =     [.................101.1...1110011]
csrrwi4 =     [.................1011....1110011]

mul =        [0000001..........000.....0110011]
mulh =       [0000001..........001.....0110011]
mulhsu =     [0000001..........010.....0110011]
mulhu =      [0000001..........011.....0110011]

div =        [0000001..........100.....0110011]
divu =       [0000001..........101.....0110011]
rem =        [0000001..........110.....0110011]
remu =       [0000001..........111.....0110011]


.input

rv32i = {
        i[31]
        i[30]
        i[29]
        i[28]
        i[27]
        i[26]
        i[25]
        i[24]
        i[23]
        i[22]
        i[21]
        i[20]
        i[19]
        i[18]
        i[17]
        i[16]
        i[15]
        i[14]
        i[13]
        i[12]
        i[11]
        i[10]
        i[9]
        i[8]
        i[7]
        i[6]
        i[5]
        i[4]
        i[3]
        i[2]
        i[1]
        i[0]
}


.output

rv32i = {
      alu
      rs1
      rs2
      imm12
      rd
      shimm5
      imm20
      pc
      load
      store
      lsu
      add
      sub
      land
      lor
      lxor
      sll
      sra
      srl
      slt
      unsign
      condbr
      beq
      bne
      bge
      blt
      jal
      by
      half
      word
      csr_read
      csr_clr
      csr_set
      csr_write
      csr_imm
      presync
      postsync
      ebreak
      ecall
      mret
      mul
      rs1_sign
      rs2_sign
      low
      div
      rem
      fence
      fence_i
      pm_alu
}

.decode

rv32i[mul]    = { mul rs1 rs2 rd low }
rv32i[mulh]   = { mul rs1 rs2 rd rs1_sign rs2_sign }
rv32i[mulhu]  = { mul rs1 rs2 rd                   }
rv32i[mulhsu] = { mul rs1 rs2 rd rs1_sign          }

rv32i[div]    =  { div rs1 rs2 rd        presync postsync}
rv32i[divu]    = { div rs1 rs2 rd unsign presync postsync}
rv32i[rem]    =  { div rs1 rs2 rd        presync postsync rem}
rv32i[remu]    = { div rs1 rs2 rd unsign presync postsync rem}

rv32i[add]   = { alu rs1 rs2   rd add pm_alu }
rv32i[addi]  = { alu rs1 imm12 rd add pm_alu }

rv32i[sub]  =  { alu rs1 rs2   rd sub pm_alu }

rv32i[and]   = { alu rs1 rs2   rd land pm_alu }
rv32i[andi]  = { alu rs1 imm12 rd land pm_alu }

rv32i[or]   =  { alu rs1 rs2   rd lor pm_alu }
rv32i[ori]  =  { alu rs1 imm12 rd lor pm_alu }

rv32i[xor]  =  { alu rs1 rs2   rd lxor pm_alu }
rv32i[xori]  = { alu rs1 imm12 rd lxor pm_alu }

rv32i[sll]  =  { alu rs1 rs2    rd sll pm_alu }
rv32i[slli]  = { alu rs1 shimm5 rd sll pm_alu }

rv32i[sra]  =  { alu rs1 rs2    rd sra pm_alu }
rv32i[srai]  = { alu rs1 shimm5 rd sra pm_alu }

rv32i[srl]  =  { alu rs1 rs2    rd srl pm_alu }
rv32i[srli]  = { alu rs1 shimm5 rd srl pm_alu }

rv32i[lui]    =  { alu imm20    rd lor pm_alu }
rv32i[auipc]  =  { alu imm20 pc rd add pm_alu }


rv32i[slt] =     { alu rs1 rs2    rd sub slt        pm_alu }
rv32i[sltu] =    { alu rs1 rs2    rd sub slt unsign pm_alu }
rv32i[slti] =    { alu rs1 imm12  rd sub slt        pm_alu }
rv32i[sltiu] =   { alu rs1 imm12  rd sub slt unsign pm_alu }

rv32i[beq] =     { alu rs1 rs2 sub condbr beq }
rv32i[bne] =     { alu rs1 rs2 sub condbr bne }
rv32i[bge] =     { alu rs1 rs2 sub condbr bge }
rv32i[blt] =     { alu rs1 rs2 sub condbr blt }
rv32i[bgeu] =    { alu rs1 rs2 sub condbr bge unsign }
rv32i[bltu] =    { alu rs1 rs2 sub condbr blt unsign }

rv32i[jal] =     { alu imm20 rd pc    jal }
rv32i[jalr] =    { alu rs1   rd imm12 jal }

rv32i[lb] =      { lsu load rs1 rd by    }
rv32i[lh] =      { lsu load rs1 rd half  }
rv32i[lw] =      { lsu load rs1 rd word  }
rv32i[lbu] =     { lsu load rs1 rd by   unsign  }
rv32i[lhu] =     { lsu load rs1 rd half unsign  }

rv32i[sb] =      { lsu store rs1 rs2 by   }
rv32i[sh] =      { lsu store rs1 rs2 half }
rv32i[sw] =      { lsu store rs1 rs2 word }


rv32i[fence] =   { alu lor fence presync}

# fence.i has fence effect in addtion to flush I$ and redirect
rv32i[fence.i] = { alu lor fence fence_i presync postsync}

# nops for now

rv32i[ebreak] = {  alu rs1 imm12 rd lor ebreak postsync}
rv32i[ecall] =  {  alu rs1 imm12 rd lor ecall  postsync}
rv32i[mret] =   {  alu rs1 imm12 rd lor mret   postsync}

rv32i[wfi] =    {  alu rs1 imm12 rd lor pm_alu }

# csr means read

# csr_read - put csr on rs2 and rs1 0's
rv32i[csrrc_ro] =        { alu rd csr_read lor }

# put csr on rs2 and make rs1 0's into alu.  Save rs1 for csr_clr later
rv32i[csrrc_rw{0-4}] =   { alu rd csr_read rs1 csr_clr            lor presync postsync }

rv32i[csrrci_ro] =       { alu rd csr_read lor }

rv32i[csrrci_rw{0-4}] =  { alu rd csr_read rs1 csr_clr   csr_imm  lor presync postsync }

rv32i[csrrs_ro] =        { alu rd csr_read lor }

rv32i[csrrs_rw{0-4}] =   { alu rd csr_read rs1 csr_set            lor presync postsync }

rv32i[csrrsi_ro] =       { alu rd csr_read lor }

rv32i[csrrsi_rw{0-4}] =  { alu rd csr_read rs1 csr_set   csr_imm lor presync postsync }

rv32i[csrrw{0-4}] =     { alu rd csr_read rs1 csr_write         lor presync postsync }


rv32i[csrrwi{0-4}] =         { alu rd csr_read rs1 csr_write csr_imm lor presync postsync }

# optimize csr write only - pipelined
rv32i[csrw] =                { alu rd rs1 csr_write           }

rv32i[csrwi]       =         { alu rd     csr_write csr_imm   }


.end