| # Copyright (C) 2012-2018 Apple Inc. All rights reserved. |
| # Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions |
| # are met: |
| # 1. Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # 2. Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # |
| # THIS SOFTWARE IS PROVIDED BY MIPS TECHNOLOGIES, INC. ``AS IS'' AND ANY |
| # EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MIPS TECHNOLOGIES, INC. OR |
| # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| # OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| require 'risc' |
| |
| # GPR conventions, to match the baseline JIT |
| # |
| # $a0 => a0, t7 |
| # $a1 => a1, t8 |
| # $a2 => a2, t9 |
| # $a3 => a3, t10 |
| # $v0 => t0, r0 |
| # $v1 => t1, r1 |
| # $t0 => (scratch) |
| # $t1 => (scratch) |
| # $t2 => t2 |
| # $t3 => t3 |
| # $t4 => t4 |
| # $t5 => t5 |
| # $t6 => t6 |
| # $t7 => (scratch) |
| # $t8 => (scratch) |
| # $t9 => (stores the callee of a call opcode) |
| # $gp => (globals) |
| # $s4 => (callee-save used to preserve $gp across calls) |
| # $ra => lr |
| # $sp => sp |
| # $fp => cfr |
| # |
| # FPR conventions, to match the baseline JIT |
| # We don't have fa2 or fa3! |
| # $f0 => ft0, fr |
| # $f2 => ft1 |
| # $f4 => ft2 |
| # $f6 => ft3 |
| # $f8 => ft4 |
| # $f10 => ft5 |
| # $f12 => fa0 |
| # $f14 => fa1 |
| # $f16 => (scratch) |
| # $f18 => (scratch) |
| |
| class Assembler |
| def putStr(str) |
| @outp.puts str |
| end |
| end |
| |
| class Node |
| def mipsSingleHi |
| doubleOperand = mipsOperand |
| raise "Bogus register name #{doubleOperand}" unless doubleOperand =~ /^\$f/ |
| "$f" + ($~.post_match.to_i + 1).to_s |
| end |
| def mipsSingleLo |
| doubleOperand = mipsOperand |
| raise "Bogus register name #{doubleOperand}" unless doubleOperand =~ /^\$f/ |
| doubleOperand |
| end |
| end |
| |
| class SpecialRegister < NoChildren |
| def mipsOperand |
| @name |
| end |
| |
| def dump |
| @name |
| end |
| |
| def register? |
| true |
| end |
| end |
| |
| MIPS_TEMP_GPRS = [SpecialRegister.new("$t0"), SpecialRegister.new("$t1"), SpecialRegister.new("$t7"), SpecialRegister.new("$t8")] |
| MIPS_ZERO_REG = SpecialRegister.new("$zero") |
| MIPS_GP_REG = SpecialRegister.new("$gp") |
| MIPS_GPSAVE_REG = SpecialRegister.new("$s4") |
| MIPS_CALL_REG = SpecialRegister.new("$t9") |
| MIPS_RETURN_ADDRESS_REG = SpecialRegister.new("$ra") |
| MIPS_TEMP_FPRS = [SpecialRegister.new("$f16")] |
| MIPS_SCRATCH_FPR = SpecialRegister.new("$f18") |
| |
| def mipsMoveImmediate(value, register) |
| if value == 0 |
| $asm.puts "add #{register.mipsOperand}, $zero, $zero" |
| else |
| $asm.puts "li #{register.mipsOperand}, #{value}" |
| end |
| end |
| |
| class RegisterID |
| def mipsOperand |
| case name |
| when "a0", "t7" |
| "$a0" |
| when "a1", "t8" |
| "$a1" |
| when "a2", "t9" |
| "$a2" |
| when "a3", "t10" |
| "$a3" |
| when "t0", "r0" |
| "$v0" |
| when "t1", "r1" |
| "$v1" |
| when "t2" |
| "$t2" |
| when "t3" |
| "$t3" |
| when "t4" |
| "$t4" |
| when "t5" |
| "$t5" |
| when "cfr" |
| "$fp" |
| when "csr0" |
| "$s0" |
| when "lr" |
| "$ra" |
| when "sp" |
| "$sp" |
| else |
| raise "Bad register #{name} for MIPS at #{codeOriginString}" |
| end |
| end |
| end |
| |
| class FPRegisterID |
| def mipsOperand |
| case name |
| when "ft0", "fr" |
| "$f0" |
| when "ft1" |
| "$f2" |
| when "ft2" |
| "$f4" |
| when "ft3" |
| "$f6" |
| when "ft4" |
| "$f8" |
| when "ft5" |
| "$f10" |
| when "fa0" |
| "$f12" |
| when "fa1" |
| "$f14" |
| else |
| raise "Bad register #{name} for MIPS at #{codeOriginString}" |
| end |
| end |
| end |
| |
| class Immediate |
| def mipsOperand |
| raise "Invalid immediate #{value} at #{codeOriginString}" if value < -0x7fff or value > 0xffff |
| "#{value}" |
| end |
| end |
| |
| class Address |
| def mipsOperand |
| raise "Bad offset at #{codeOriginString}" if offset.value < -0x7fff or offset.value > 0x7fff |
| "#{offset.value}(#{base.mipsOperand})" |
| end |
| end |
| |
| class AbsoluteAddress |
| def mipsOperand |
| raise "Unconverted absolute address at #{codeOriginString}" |
| end |
| end |
| |
| # |
| # Negate condition of branches to labels. |
| # |
| |
| class Instruction |
| def mipsNegateCondition(list) |
| /^(b(add|sub|or|mul|t)?)([ipb])/.match(opcode) |
| case $~.post_match |
| when "eq" |
| op = "neq" |
| when "neq" |
| op = "eq" |
| when "z" |
| op = "nz" |
| when "nz" |
| op = "z" |
| when "gt" |
| op = "lteq" |
| when "gteq" |
| op = "lt" |
| when "lt" |
| op = "gteq" |
| when "lteq" |
| op = "gt" |
| when "a" |
| op = "beq" |
| when "b" |
| op = "aeq" |
| when "aeq" |
| op = "b" |
| when "beq" |
| op = "a" |
| else |
| raise "Can't negate #{opcode} branch." |
| end |
| noBranch = LocalLabel.unique("nobranch") |
| noBranchRef = LocalLabelReference.new(codeOrigin, noBranch) |
| toRef = operands[-1] |
| list << Instruction.new(codeOrigin, "#{$1}#{$3}#{op}", operands[0..-2].push(noBranchRef), annotation) |
| list << Instruction.new(codeOrigin, "la", [toRef, MIPS_CALL_REG]) |
| list << Instruction.new(codeOrigin, "jmp", [MIPS_CALL_REG]) |
| list << noBranch |
| end |
| end |
| |
| def mipsLowerFarBranchOps(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| annotation = node.annotation |
| case node.opcode |
| when /^b(add|sub|or|mul|t)?([ipb])/ |
| if node.operands[-1].is_a? LabelReference |
| node.mipsNegateCondition(newList) |
| next |
| end |
| end |
| end |
| newList << node |
| } |
| newList |
| end |
| |
| # |
| # Lower 'and' masked branches |
| # |
| |
| def lowerMIPSCondBranch(list, condOp, node) |
| if node.operands.size == 2 |
| list << Instruction.new(node.codeOrigin, |
| condOp, |
| [node.operands[0], MIPS_ZERO_REG, node.operands[-1]], |
| node.annotation) |
| elsif node.operands.size == 3 |
| tl = condOp[-1, 1] |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| list << Instruction.new(node.codeOrigin, |
| "and" + tl, |
| [node.operands[0], node.operands[1], tmp], |
| node.annotation) |
| list << Instruction.new(node.codeOrigin, |
| condOp, |
| [tmp, MIPS_ZERO_REG, node.operands[-1]]) |
| else |
| raise "Expected 2 or 3 operands but got #{node.operands.size} at #{node.codeOriginString}" |
| end |
| end |
| |
| # |
| # Lowering of branch ops. For example: |
| # |
| # baddiz foo, bar, baz |
| # |
| # will become: |
| # |
| # addi foo, bar |
| # bz baz |
| # |
| |
| def mipsLowerSimpleBranchOps(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| annotation = node.annotation |
| case node.opcode |
| when /^b(addi|subi|ori|addp)/ |
| op = $1 |
| bc = $~.post_match |
| branch = "b" + bc |
| |
| case op |
| when "addi", "addp" |
| op = "addi" |
| when "subi" |
| op = "subi" |
| when "ori" |
| op = "ori" |
| end |
| |
| if bc == "o" |
| case op |
| when "addi" |
| # addu $s0, $s1, $s2 |
| # xor $t0, $s1, $s2 |
| # blt $t0, $zero, no overflow |
| # xor $t0, $s0, $s1 |
| # blt $t0, $zero, overflow |
| # no overflow: |
| # |
| tr = Tmp.new(node.codeOrigin, :gpr) |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| noFlow = LocalLabel.unique("noflow") |
| noFlowRef = LocalLabelReference.new(node.codeOrigin, noFlow) |
| newList << Instruction.new(node.codeOrigin, op, [node.operands[0], node.operands[1], tr], annotation) |
| newList << Instruction.new(node.codeOrigin, "xori", [node.operands[0], node.operands[1], tmp]) |
| newList << Instruction.new(node.codeOrigin, "bilt", [tmp, MIPS_ZERO_REG, noFlowRef]) |
| newList << Instruction.new(node.codeOrigin, "xori", [tr, node.operands[0], tmp]) |
| newList << Instruction.new(node.codeOrigin, "bilt", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| newList << noFlow |
| newList << Instruction.new(node.codeOrigin, "move", [tr, node.operands[1]]) |
| when "subi" |
| # subu $s0, $s1, $s2 |
| # xor $t0, $s1, $s2 |
| # bge $t0, $zero, no overflow |
| # xor $t0, $s0, $s1 |
| # blt $t0, $zero, overflow |
| # no overflow: |
| # |
| tr = Tmp.new(node.codeOrigin, :gpr) |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| noFlow = LocalLabel.unique("noflow") |
| noFlowRef = LocalLabelReference.new(node.codeOrigin, noFlow) |
| newList << Instruction.new(node.codeOrigin, op, [node.operands[1], node.operands[0], tr], annotation) |
| newList << Instruction.new(node.codeOrigin, "xori", [node.operands[1], node.operands[0], tmp]) |
| newList << Instruction.new(node.codeOrigin, "bigteq", [tmp, MIPS_ZERO_REG, noFlowRef]) |
| newList << Instruction.new(node.codeOrigin, "xori", [tr, node.operands[1], tmp]) |
| newList << Instruction.new(node.codeOrigin, "bilt", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| newList << noFlow |
| newList << Instruction.new(node.codeOrigin, "move", [tr, node.operands[1]]) |
| when "ori" |
| # no ovwerflow at ori |
| newList << Instruction.new(node.codeOrigin, op, node.operands[0..1], annotation) |
| end |
| else |
| if node.operands[1].is_a? Address |
| addr = node.operands[1] |
| tr = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "loadp", [addr, tr], annotation) |
| newList << Instruction.new(node.codeOrigin, op, [node.operands[0], tr]) |
| newList << Instruction.new(node.codeOrigin, "storep", [tr, addr]) |
| else |
| tr = node.operands[1] |
| newList << Instruction.new(node.codeOrigin, op, node.operands[0..-2], annotation) |
| end |
| newList << Instruction.new(node.codeOrigin, branch, [tr, MIPS_ZERO_REG, node.operands[-1]]) |
| end |
| when "bia", "bpa", "bba" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| comp = node.opcode[1] == ?b ? "sltub" : "sltu" |
| newList << Instruction.new(node.codeOrigin, comp, [tmp, node.operands[1], node.operands[0]], annotation) |
| newList << Instruction.new(node.codeOrigin, "bnz", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| when "biaeq", "bpaeq", "bbaeq" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| comp = node.opcode[1] == ?b ? "sltub" : "sltu" |
| newList << Instruction.new(node.codeOrigin, comp, [tmp, node.operands[0], node.operands[1]], annotation) |
| newList << Instruction.new(node.codeOrigin, "bz", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| when "bib", "bpb", "bbb" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| comp = node.opcode[1] == ?b ? "sltub" : "sltu" |
| newList << Instruction.new(node.codeOrigin, comp, [tmp, node.operands[0], node.operands[1]], annotation) |
| newList << Instruction.new(node.codeOrigin, "bnz", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| when "bibeq", "bpbeq", "bbbeq" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| comp = node.opcode[1] == ?b ? "sltub" : "sltu" |
| newList << Instruction.new(node.codeOrigin, comp, [tmp, node.operands[1], node.operands[0]], annotation) |
| newList << Instruction.new(node.codeOrigin, "bz", [tmp, MIPS_ZERO_REG, node.operands[2]]) |
| when /^bt(i|p|b)/ |
| lowerMIPSCondBranch(newList, "b" + $~.post_match + $1, node) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Specialization of lowering of malformed BaseIndex addresses. |
| # |
| |
| class Node |
| def mipsLowerMalformedAddressesRecurse(list) |
| mapChildren { |
| | subNode | |
| subNode.mipsLowerMalformedAddressesRecurse(list) |
| } |
| end |
| |
| def mipsLowerShiftedAddressesRecurse(list, isFirst, tmp) |
| mapChildren { |
| | subNode | |
| subNode.mipsLowerShiftedAddressesRecurse(list, isFirst, tmp) |
| } |
| end |
| end |
| |
| class BaseIndex |
| def mipsLowerMalformedAddressesRecurse(list) |
| tmp = Tmp.new(codeOrigin, :gpr) |
| if scaleShift == 0 |
| list << Instruction.new(codeOrigin, "addp", [base, index, tmp]) |
| Address.new(codeOrigin, tmp, Immediate.new(codeOrigin, offset.value)); |
| end |
| end |
| |
| def mipsLowerShiftedAddressesRecurse(list, isFirst, tmp) |
| if isFirst |
| list << Instruction.new(codeOrigin, "lshifti", [index, Immediate.new(codeOrigin, scaleShift), tmp]); |
| list << Instruction.new(codeOrigin, "addp", [base, tmp]) |
| end |
| Address.new(codeOrigin, tmp, Immediate.new(codeOrigin, offset.value)); |
| end |
| end |
| |
| # |
| # Lowering of BaseIndex addresses with optimization for MIPS. |
| # |
| # offline asm instruction pair: |
| # loadi 4[cfr, t0, 8], t2 |
| # loadi 0[cfr, t0, 8], t0 |
| # |
| # lowered instructions: |
| # lshifti t0, 3, tmp |
| # addp cfr, tmp |
| # loadi 4[tmp], t2 |
| # loadi 0[tmp], t0 |
| # |
| |
| def mipsHasShiftedBaseIndexAddress(instruction) |
| instruction.operands.each_with_index { |
| | operand, index | |
| if operand.is_a? BaseIndex and operand.scaleShift != 0 |
| return index |
| end |
| } |
| -1 |
| end |
| |
| def mipsScaleOfBaseIndexMatches(baseIndex0, baseIndex1) |
| baseIndex0.base == baseIndex1.base and |
| baseIndex0.index == baseIndex1.index and |
| baseIndex0.scale == baseIndex1.scale |
| end |
| |
| def mipsLowerBaseIndexAddresses(list) |
| newList = [ list[0] ] |
| tmp = nil |
| list.each_cons(2) { |
| | nodes | |
| if nodes[1].is_a? Instruction |
| ind = mipsHasShiftedBaseIndexAddress(nodes[1]) |
| if ind != -1 |
| if nodes[0].is_a? Instruction and |
| nodes[0].opcode == nodes[1].opcode and |
| ind == mipsHasShiftedBaseIndexAddress(nodes[0]) and |
| mipsScaleOfBaseIndexMatches(nodes[0].operands[ind], nodes[1].operands[ind]) |
| |
| newList << nodes[1].mipsLowerShiftedAddressesRecurse(newList, false, tmp) |
| else |
| tmp = Tmp.new(codeOrigin, :gpr) |
| newList << nodes[1].mipsLowerShiftedAddressesRecurse(newList, true, tmp) |
| end |
| else |
| newList << nodes[1].mipsLowerMalformedAddressesRecurse(newList) |
| end |
| else |
| newList << nodes[1] |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of misplaced immediates of MIPS specific instructions. For example: |
| # |
| # sltu reg, 4, 2 |
| # |
| # will become: |
| # |
| # move 4, tmp |
| # sltu reg, tmp, 2 |
| # |
| |
| def mipsLowerMisplacedImmediates(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| case node.opcode |
| when "slt", "sltu", "sltb", "sltub" |
| if node.operands[1].is_a? Immediate |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "move", [node.operands[1], tmp], node.annotation) |
| newList << Instruction.new(node.codeOrigin, node.opcode, |
| [node.operands[0], tmp, node.operands[2]], |
| node.annotation) |
| else |
| newList << node |
| end |
| when /^(addi|subi)/ |
| newList << node.riscLowerMalformedImmediatesRecurse(newList, -0x7fff..0x7fff) |
| when "andi", "andp", "ori", "orp", "orh", "xori", "xorp" |
| newList << node.riscLowerMalformedImmediatesRecurse(newList, 0..0xffff) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Specialization of lowering of misplaced addresses. |
| # |
| |
| class LocalLabelReference |
| def register? |
| false |
| end |
| end |
| |
| def mipsAsRegister(preList, postList, operand, needRestore) |
| tmp = MIPS_CALL_REG |
| if operand.address? |
| preList << Instruction.new(operand.codeOrigin, "loadp", [operand, MIPS_CALL_REG]) |
| elsif operand.is_a? LabelReference |
| preList << Instruction.new(operand.codeOrigin, "la", [operand, MIPS_CALL_REG]) |
| elsif operand.register? and operand != MIPS_CALL_REG |
| preList << Instruction.new(operand.codeOrigin, "move", [operand, MIPS_CALL_REG]) |
| else |
| needRestore = false |
| tmp = operand |
| end |
| if needRestore |
| postList << Instruction.new(operand.codeOrigin, "move", [MIPS_GPSAVE_REG, MIPS_GP_REG]) |
| end |
| tmp |
| end |
| |
| def mipsLowerMisplacedAddresses(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| postInstructions = [] |
| annotation = node.annotation |
| case node.opcode |
| when "jmp" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| [mipsAsRegister(newList, [], node.operands[0], false)]) |
| when "call" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| [mipsAsRegister(newList, postInstructions, node.operands[0], true)]) |
| when "slt", "sltu" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, [], node.operands, "i")) |
| when "sltub", "sltb" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, [], node.operands, "b")) |
| when "andb" |
| newList << Instruction.new(node.codeOrigin, |
| "andi", |
| riscAsRegisters(newList, [], node.operands, "b")) |
| when /^(bz|bnz|bs|bo)/ |
| tl = $~.post_match == "" ? "i" : $~.post_match |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, [], node.operands, tl)) |
| else |
| newList << node |
| end |
| newList += postInstructions |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering compares and tests. |
| # |
| |
| def mipsLowerCompareTemplate(list, node, opCmp, opMov) |
| tmp0 = Tmp.new(node.codeOrigin, :gpr) |
| tmp1 = Tmp.new(node.codeOrigin, :gpr) |
| list << Instruction.new(node.codeOrigin, "move", [Immediate.new(nil, 0), node.operands[2]]) |
| list << Instruction.new(node.codeOrigin, opCmp, [node.operands[1], node.operands[0], tmp0]) |
| list << Instruction.new(node.codeOrigin, "move", [Immediate.new(nil, 1), tmp1]) |
| list << Instruction.new(node.codeOrigin, opMov, [node.operands[2], tmp1, tmp0]) |
| end |
| |
| def mipsLowerCompares(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| case node.opcode |
| when "cieq", "cpeq", "cbeq" |
| mipsLowerCompareTemplate(newList, node, "subp", "movz") |
| when "cineq", "cpneq", "cbneq" |
| mipsLowerCompareTemplate(newList, node, "subp", "movn") |
| when "tiz", "tbz", "tpz" |
| mipsLowerCompareTemplate(newList, node, "andp", "movz") |
| when "tinz", "tbnz", "tpnz" |
| mipsLowerCompareTemplate(newList, node, "andp", "movn") |
| when "tio", "tbo", "tpo" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| list << Instruction.new(node.codeOrigin, "andp", [node.operands[1], node.operands[0], tmp]) |
| list << Instruction.new(node.codeOrigin, "slt", [node.operands[2], MIPS_ZERO_REG, tmp]) |
| when "tis", "tbs", "tps" |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| list << Instruction.new(node.codeOrigin, "andp", [node.operands[1], node.operands[0], tmp]) |
| list << Instruction.new(node.codeOrigin, "slt", [node.operands[2], tmp, MIPS_ZERO_REG]) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lea support. |
| # |
| |
| class Address |
| def mipsEmitLea(destination) |
| if destination == base |
| $asm.puts "addiu #{destination.mipsOperand}, #{offset.value}" |
| else |
| $asm.puts "addiu #{destination.mipsOperand}, #{base.mipsOperand}, #{offset.value}" |
| end |
| end |
| end |
| |
| # |
| # Add PIC compatible header code to all the LLInt rutins. |
| # |
| |
| def mipsAddPICCode(list) |
| myList = [] |
| list.each { |
| | node | |
| myList << node |
| if node.is_a? Label |
| if node.name =~ /^.*_return_location(?:_(?:wide16|wide32))?$/ |
| # We need to have a special case for return location labels because they are always |
| # reached from a `ret` instruction. In this case, we need to proper reconfigure `$gp` |
| # using `$ra` instead of using `$t9`. |
| myList << Instruction.new(node.codeOrigin, "pichdr", [MIPS_RETURN_ADDRESS_REG]) |
| else |
| myList << Instruction.new(node.codeOrigin, "pichdr", [MIPS_CALL_REG]) |
| end |
| end |
| } |
| myList |
| end |
| |
| # |
| # Actual lowering code follows. |
| # |
| |
| class Sequence |
| def getModifiedListMIPS |
| result = @list |
| |
| # Verify that we will only see instructions and labels. |
| result.each { |
| | node | |
| unless node.is_a? Instruction or |
| node.is_a? Label or |
| node.is_a? LocalLabel or |
| node.is_a? Skip |
| raise "Unexpected #{node.inspect} at #{node.codeOrigin}" |
| end |
| } |
| |
| result = mipsAddPICCode(result) |
| result = mipsLowerFarBranchOps(result) |
| result = mipsLowerSimpleBranchOps(result) |
| result = riscLowerSimpleBranchOps(result) |
| result = riscLowerHardBranchOps(result) |
| result = riscLowerShiftOps(result) |
| result = mipsLowerBaseIndexAddresses(result) |
| result = riscLowerMalformedAddresses(result) { |
| | node, address | |
| if address.is_a? Address |
| (-0x7fff..0x7fff).include? address.offset.value |
| else |
| false |
| end |
| } |
| result = riscLowerMalformedAddressesDouble(result) |
| result = riscLowerMisplacedImmediates(result, ["storeb", "storei", "storep"]) |
| result = mipsLowerMisplacedImmediates(result) |
| result = riscLowerMalformedImmediates(result, -0x7fff..0x7fff, -0x7fff..0x7fff) |
| result = mipsLowerMisplacedAddresses(result) |
| result = riscLowerMisplacedAddresses(result) |
| result = riscLowerRegisterReuse(result) |
| result = mipsLowerCompares(result) |
| result = assignRegistersToTemporaries(result, :gpr, MIPS_TEMP_GPRS) |
| result = assignRegistersToTemporaries(result, :fpr, MIPS_TEMP_FPRS) |
| |
| return result |
| end |
| end |
| |
| def mipsOperands(operands) |
| operands.map{|v| v.mipsOperand}.join(", ") |
| end |
| |
| def mipsFlippedOperands(operands) |
| mipsOperands([operands[-1]] + operands[0..-2]) |
| end |
| |
| def getMIPSOpcode(opcode, suffix) |
| |
| end |
| |
| def emitMIPSCompact(opcode, opcodei, operands) |
| postfix = "" |
| if opcode == "sub" |
| if operands[0].is_a? Immediate |
| opcode = "add" |
| operands[0] = Immediate.new(operands[0].codeOrigin, -1 * operands[0].value) |
| elsif operands[1].is_a? Immediate |
| opcode = "add" |
| operands[1] = Immediate.new(operands[1].codeOrigin, -1 * operands[1].value) |
| end |
| postfix = "u" |
| elsif opcode == "add" |
| postfix = "u" |
| end |
| if operands.size == 3 |
| if operands[0].is_a? Immediate |
| $asm.puts "#{opcode}i#{postfix} #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].value}" |
| elsif operands[1].is_a? Immediate |
| $asm.puts "#{opcode}i#{postfix} #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].value}" |
| else |
| $asm.puts "#{opcode}#{postfix} #{mipsFlippedOperands(operands)}" |
| end |
| else |
| raise unless operands.size == 2 |
| raise unless operands[1].register? |
| if operands[0].is_a? Immediate |
| $asm.puts "#{opcode}i#{postfix} #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| else |
| $asm.puts "#{opcode}#{postfix} #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| end |
| end |
| end |
| |
| def emitMIPSShiftCompact(opcode, operands) |
| if operands.size == 3 |
| if (operands[1].is_a? Immediate) |
| $asm.puts "#{opcode} #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].value}" |
| else |
| $asm.puts "#{opcode}v #{mipsFlippedOperands(operands)}" |
| end |
| else |
| raise unless operands.size == 2 |
| if operands[0].register? |
| $asm.puts "#{opcode}v #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| else |
| $asm.puts "#{opcode} #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].value}" |
| end |
| end |
| end |
| |
| def emitMIPS(opcode, operands) |
| if operands.size == 3 |
| $asm.puts "#{opcode} #{mipsFlippedOperands(operands)}" |
| else |
| raise unless operands.size == 2 |
| $asm.puts "#{opcode} #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| end |
| end |
| |
| def emitMIPSDoubleBranch(branchOpcode, neg, operands) |
| $asm.puts "c.#{branchOpcode}.d #{mipsOperands(operands[0..1])}" |
| if (!neg) |
| $asm.puts "bc1t #{operands[2].asmLabel}" |
| else |
| $asm.puts "bc1f #{operands[2].asmLabel}" |
| end |
| end |
| |
| def emitMIPSJumpOrCall(opcode, operand) |
| if operand.label? |
| raise "Direct call/jump to a not local label." unless operand.is_a? LocalLabelReference |
| $asm.puts "#{opcode} #{operand.asmLabel}" |
| else |
| raise "Invalid call/jump register." unless operand == MIPS_CALL_REG |
| $asm.puts "#{opcode}r #{MIPS_CALL_REG.mipsOperand}" |
| end |
| end |
| |
| class Instruction |
| def lowerMIPS |
| case opcode |
| when "addi", "addp", "addis" |
| if operands.size == 3 and operands[0].is_a? Immediate |
| raise unless operands[1].register? |
| raise unless operands[2].register? |
| if operands[0].value == 0 #and suffix.empty? |
| unless operands[1] == operands[2] |
| $asm.puts "move #{operands[2].mipsOperand}, #{operands[1].mipsOperand}" |
| end |
| else |
| $asm.puts "addiu #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| end |
| elsif operands.size == 3 and operands[0].register? |
| raise unless operands[1].register? |
| raise unless operands[2].register? |
| $asm.puts "addu #{mipsFlippedOperands(operands)}" |
| else |
| if operands[0].is_a? Immediate |
| unless Immediate.new(nil, 0) == operands[0] |
| $asm.puts "addiu #{operands[1].mipsOperand}, #{mipsFlippedOperands(operands)}" |
| end |
| else |
| $asm.puts "addu #{operands[1].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| end |
| end |
| when "andi", "andp" |
| emitMIPSCompact("and", "and", operands) |
| when "ori", "orp", "orh" |
| emitMIPSCompact("or", "orr", operands) |
| when "oris" |
| emitMIPSCompact("or", "orrs", operands) |
| when "xori", "xorp" |
| emitMIPSCompact("xor", "eor", operands) |
| when "lshifti", "lshiftp" |
| emitMIPSShiftCompact("sll", operands) |
| when "rshifti", "rshiftp" |
| emitMIPSShiftCompact("sra", operands) |
| when "urshifti", "urshiftp" |
| emitMIPSShiftCompact("srl", operands) |
| when "muli", "mulp" |
| emitMIPS("mul", operands) |
| when "subi", "subp", "subis" |
| emitMIPSCompact("sub", "subs", operands) |
| when "negi", "negp" |
| $asm.puts "negu #{operands[0].mipsOperand}, #{operands[0].mipsOperand}" |
| when "noti" |
| $asm.puts "nor #{operands[0].mipsOperand}, #{operands[0].mipsOperand}, $zero" |
| when "loadi", "loadis", "loadp" |
| $asm.puts "lw #{mipsFlippedOperands(operands)}" |
| when "storei", "storep" |
| $asm.puts "sw #{mipsOperands(operands)}" |
| when "loadb" |
| $asm.puts "lbu #{mipsFlippedOperands(operands)}" |
| when "loadbsi" |
| $asm.puts "lb #{mipsFlippedOperands(operands)}" |
| when "storeb" |
| $asm.puts "sb #{mipsOperands(operands)}" |
| when "loadh" |
| $asm.puts "lhu #{mipsFlippedOperands(operands)}" |
| when "loadhsi" |
| $asm.puts "lh #{mipsFlippedOperands(operands)}" |
| when "storeh" |
| $asm.puts "shv #{mipsOperands(operands)}" |
| when "loadd" |
| $asm.puts "ldc1 #{mipsFlippedOperands(operands)}" |
| when "stored" |
| $asm.puts "sdc1 #{mipsOperands(operands)}" |
| when "la" |
| $asm.puts "la #{operands[1].mipsOperand}, #{operands[0].asmLabel}" |
| when "addd" |
| emitMIPS("add.d", operands) |
| when "divd" |
| emitMIPS("div.d", operands) |
| when "subd" |
| emitMIPS("sub.d", operands) |
| when "muld" |
| emitMIPS("mul.d", operands) |
| when "sqrtd" |
| $asm.puts "sqrt.d #{mipsFlippedOperands(operands)}" |
| when "ci2ds" |
| raise "invalid ops of #{self.inspect} at #{codeOriginString}" unless operands[1].is_a? FPRegisterID and operands[0].register? |
| $asm.puts "mtc1 #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| $asm.puts "cvt.d.w #{operands[1].mipsOperand}, #{operands[1].mipsOperand}" |
| when "bdeq" |
| emitMIPSDoubleBranch("eq", false, operands) |
| when "bdneq" |
| emitMIPSDoubleBranch("ueq", true, operands) |
| when "bdgt" |
| emitMIPSDoubleBranch("ule", true, operands) |
| when "bdgteq" |
| emitMIPSDoubleBranch("ult", true, operands) |
| when "bdlt" |
| emitMIPSDoubleBranch("olt", false, operands) |
| when "bdlteq" |
| emitMIPSDoubleBranch("ole", false, operands) |
| when "bdequn" |
| emitMIPSDoubleBranch("ueq", false, operands) |
| when "bdnequn" |
| emitMIPSDoubleBranch("eq", true, operands) |
| when "bdgtun" |
| emitMIPSDoubleBranch("ole", true, operands) |
| when "bdgtequn" |
| emitMIPSDoubleBranch("olt", true, operands) |
| when "bdltun" |
| emitMIPSDoubleBranch("ult", false, operands) |
| when "bdltequn" |
| emitMIPSDoubleBranch("ule", false, operands) |
| when "btd2i" |
| # FIXME: may be a good idea to just get rid of this instruction, since the interpreter |
| # currently does not use it. |
| raise "MIPS does not support this opcode yet, #{codeOrigin}" |
| when "td2i" |
| $asm.puts "cvt.w.d #{MIPS_SCRATCH_FPR.mipsSingleLo}, #{operands[0].mipsOperand}" |
| $asm.puts "mfc1 #{operands[1].mipsOperand}, #{MIPS_SCRATCH_FPR.mipsSingleLo}" |
| when "bcd2i" |
| $asm.puts "cvt.w.d #{MIPS_SCRATCH_FPR.mipsSingleLo}, #{operands[0].mipsOperand}" |
| $asm.puts "mfc1 #{operands[1].mipsOperand}, #{MIPS_SCRATCH_FPR.mipsSingleLo}" |
| $asm.puts "cvt.d.w #{MIPS_SCRATCH_FPR.mipsOperand}, #{MIPS_SCRATCH_FPR.mipsSingleLo}" |
| emitMIPSDoubleBranch("eq", true, [MIPS_SCRATCH_FPR, operands[0], operands[2]]) |
| $asm.puts "beq #{operands[1].mipsOperand}, $zero, #{operands[2].asmLabel}" |
| when "movdz" |
| # FIXME: either support this or remove it. |
| raise "MIPS does not support this opcode yet, #{codeOrigin}" |
| when "pop" |
| operands.each { |
| | op | |
| $asm.puts "lw #{op.mipsOperand}, 0($sp)" |
| $asm.puts "addiu $sp, $sp, 4" |
| } |
| when "push" |
| operands.each { |
| | op | |
| $asm.puts "addiu $sp, $sp, -4" |
| $asm.puts "sw #{op.mipsOperand}, 0($sp)" |
| } |
| when "move", "sxi2p", "zxi2p" |
| if operands[0].is_a? Immediate |
| mipsMoveImmediate(operands[0].value, operands[1]) |
| else |
| $asm.puts "move #{mipsFlippedOperands(operands)}" |
| end |
| when "nop" |
| $asm.puts "nop" |
| when "bieq", "bpeq", "bbeq" |
| $asm.puts "beq #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "bineq", "bpneq", "bbneq" |
| $asm.puts "bne #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "bigt", "bpgt", "bbgt" |
| $asm.puts "bgt #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "bigteq", "bpgteq", "bbgteq" |
| $asm.puts "bge #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "bilt", "bplt", "bblt" |
| $asm.puts "blt #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "bilteq", "bplteq", "bblteq" |
| $asm.puts "ble #{mipsOperands(operands[0..1])}, #{operands[2].asmLabel}" |
| when "jmp" |
| emitMIPSJumpOrCall("j", operands[0]) |
| when "call" |
| emitMIPSJumpOrCall("jal", operands[0]) |
| when "break" |
| $asm.puts "break" |
| when "ret" |
| $asm.puts "jr $ra" |
| when "cia", "cpa", "cba" |
| $asm.puts "sltu #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| when "ciaeq", "cpaeq", "cbaeq" |
| $asm.puts "sltu #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| $asm.puts "xori #{operands[2].mipsOperand}, 1" |
| when "cib", "cpb", "cbb" |
| $asm.puts "sltu #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| when "cibeq", "cpbeq", "cbbeq" |
| $asm.puts "sltu #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| $asm.puts "xori #{operands[2].mipsOperand}, 1" |
| when "cigt", "cpgt", "cbgt" |
| $asm.puts "slt #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| when "cigteq", "cpgteq", "cbgteq" |
| $asm.puts "slt #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| $asm.puts "xori #{operands[2].mipsOperand}, 1" |
| when "cilt", "cplt", "cblt" |
| $asm.puts "slt #{operands[2].mipsOperand}, #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| when "cilteq", "cplteq", "cblteq" |
| $asm.puts "slt #{operands[2].mipsOperand}, #{operands[1].mipsOperand}, #{operands[0].mipsOperand}" |
| $asm.puts "xori #{operands[2].mipsOperand}, 1" |
| when "peek" |
| $asm.puts "lw #{operands[1].mipsOperand}, #{operands[0].value * 4}($sp)" |
| when "poke" |
| $asm.puts "sw #{operands[1].mipsOperand}, #{operands[0].value * 4}($sp)" |
| when "fii2d" |
| $asm.puts "mtc1 #{operands[0].mipsOperand}, #{operands[2].mipsSingleLo}" |
| $asm.putStr("#if WTF_MIPS_ISA_REV_AT_LEAST(2)") |
| $asm.puts "mthc1 #{operands[1].mipsOperand}, #{operands[2].mipsSingleLo}" |
| $asm.putStr("#else") |
| $asm.puts "mtc1 #{operands[1].mipsOperand}, #{operands[2].mipsSingleHi}" |
| $asm.putStr("#endif") |
| when "fd2ii" |
| $asm.puts "mfc1 #{operands[1].mipsOperand}, #{operands[0].mipsSingleLo}" |
| $asm.putStr("#if WTF_MIPS_ISA_REV_AT_LEAST(2)") |
| $asm.puts "mfhc1 #{operands[2].mipsOperand}, #{operands[0].mipsSingleLo}" |
| $asm.putStr("#else") |
| $asm.puts "mfc1 #{operands[2].mipsOperand}, #{operands[0].mipsSingleHi}" |
| $asm.putStr("#endif") |
| when /^bo/ |
| $asm.puts "bgt #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].asmLabel}" |
| when /^bs/ |
| $asm.puts "blt #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].asmLabel}" |
| when /^bz/ |
| $asm.puts "beq #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].asmLabel}" |
| when /^bnz/ |
| $asm.puts "bne #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].asmLabel}" |
| when "leai", "leap" |
| if operands[0].is_a? LabelReference |
| labelRef = operands[0] |
| raise unless labelRef.offset == 0 |
| $asm.puts "lw #{operands[1].mipsOperand}, %got(#{labelRef.asmLabel})($gp)" |
| else |
| operands[0].mipsEmitLea(operands[1]) |
| end |
| |
| when "smulli" |
| raise "Wrong number of arguments to smull in #{self.inspect} at #{codeOriginString}" unless operands.length == 4 |
| $asm.puts "mult #{operands[0].mipsOperand}, #{operands[1].mipsOperand}" |
| $asm.puts "mflo #{operands[2].mipsOperand}" |
| $asm.puts "mfhi #{operands[3].mipsOperand}" |
| when "movz" |
| $asm.puts "movz #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].mipsOperand}" |
| when "movn" |
| $asm.puts "movn #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].mipsOperand}" |
| when "setcallreg" |
| $asm.puts "move #{MIPS_CALL_REG.mipsOperand}, #{operands[0].mipsOperand}" |
| when "slt", "sltb" |
| $asm.puts "slt #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].mipsOperand}" |
| when "sltu", "sltub" |
| $asm.puts "sltu #{operands[0].mipsOperand}, #{operands[1].mipsOperand}, #{operands[2].mipsOperand}" |
| when "pichdr" |
| $asm.putStr("OFFLINE_ASM_CPLOAD(#{operands[0].mipsOperand})") |
| when "memfence" |
| $asm.puts "sync" |
| else |
| lowerDefault |
| end |
| end |
| end |
