| # Copyright (C) 2011, 2012 Apple 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 APPLE INC. AND ITS CONTRIBUTORS ``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 APPLE INC. OR ITS 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 'config' |
| require 'ast' |
| require 'opt' |
| |
| # This file contains utilities that are useful for implementing a backend |
| # for RISC-like processors (ARM, MIPS, etc). |
| |
| # |
| # Lowering of simple branch ops. For example: |
| # |
| # baddiz foo, bar, baz |
| # |
| # will become: |
| # |
| # addi foo, bar |
| # bz baz |
| # |
| |
| def riscLowerSimpleBranchOps(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| annotation = node.annotation |
| case node.opcode |
| when /^b(addi|subi|ori|addp)/ |
| op = $1 |
| branch = "b" + $~.post_match |
| |
| case op |
| when "addi" |
| op = "addis" |
| when "addp" |
| op = "addps" |
| when "subi" |
| op = "subis" |
| when "ori" |
| op = "oris" |
| end |
| |
| newList << Instruction.new(node.codeOrigin, op, node.operands[0..-2], annotation) |
| newList << Instruction.new(node.codeOrigin, branch, [node.operands[-1]]) |
| when 'bmulis', 'bmulz', 'bmulnz' |
| condition = $~.post_match |
| newList << Instruction.new(node.codeOrigin, "muli", node.operands[0..-2], annotation) |
| newList << Instruction.new(node.codeOrigin, "bti" + condition, [node.operands[-2], node.operands[-1]]) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowing of complex branch ops. For example: |
| # |
| # bmulio foo, bar, baz |
| # |
| # becomes: |
| # |
| # smulli foo, bar, bar, tmp1 |
| # rshifti bar, 31, tmp2 |
| # bineq tmp1, tmp2, baz |
| # |
| |
| def riscLowerHardBranchOps(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction and node.opcode == "bmulio" |
| tmp1 = Tmp.new(node.codeOrigin, :gpr) |
| tmp2 = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "smulli", [node.operands[0], node.operands[1], node.operands[1], tmp1], node.annotation) |
| newList << Instruction.new(node.codeOrigin, "rshifti", [node.operands[-2], Immediate.new(node.codeOrigin, 31), tmp2]) |
| newList << Instruction.new(node.codeOrigin, "bineq", [tmp1, tmp2, node.operands[-1]]) |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of shift ops. For example: |
| # |
| # lshifti foo, bar |
| # |
| # will become: |
| # |
| # andi foo, 31, tmp |
| # lshifti tmp, bar |
| # |
| |
| def riscSanitizeShift(operand, list) |
| return operand if operand.immediate? |
| |
| tmp = Tmp.new(operand.codeOrigin, :gpr) |
| list << Instruction.new(operand.codeOrigin, "andi", [operand, Immediate.new(operand.codeOrigin, 31), tmp]) |
| tmp |
| end |
| |
| def riscLowerShiftOps(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| case node.opcode |
| when "lshifti", "rshifti", "urshifti", "lshiftp", "rshiftp", "urshiftp" |
| if node.operands.size == 2 |
| newList << Instruction.new(node.codeOrigin, node.opcode, [riscSanitizeShift(node.operands[0], newList), node.operands[1]], node.annotation) |
| else |
| newList << Instruction.new(node.codeOrigin, node.opcode, [node.operands[0], riscSanitizeShift(node.operands[1], newList), node.operands[2]], node.annotation) |
| raise "Wrong number of operands for shift at #{node.codeOriginString}" unless node.operands.size == 3 |
| end |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of malformed addresses. For example: |
| # |
| # loadp 10000[foo], bar |
| # |
| # will become: |
| # |
| # move 10000, tmp |
| # addp foo, tmp |
| # loadp 0[tmp], bar |
| # |
| # Note that you use this lowering phase by passing it a block that returns true |
| # if you don't want to lower the address, or false if you do. For example to get |
| # the effect of the example above, the block would have to say something like: |
| # |
| # riscLowerMalformedAddresses(thingy) { |
| # | node, address | |
| # if address.is_a? Address |
| # address.offset.value > 1000 |
| # else |
| # true # don't lower anything else, in this example |
| # end |
| # } |
| # |
| # See armv7.rb for a different example, in which we lower all BaseIndex addresses |
| # that have non-zero offset, all Address addresses that have large offsets, and |
| # all other addresses (like AbsoluteAddress). |
| # |
| |
| class Node |
| def riscLowerMalformedAddressesRecurse(list, topLevelNode, &block) |
| mapChildren { |
| | subNode | |
| subNode.riscLowerMalformedAddressesRecurse(list, topLevelNode, &block) |
| } |
| end |
| end |
| |
| class Address |
| def riscLowerMalformedAddressesRecurse(list, node) |
| return self if yield node, self |
| |
| tmp = Tmp.new(codeOrigin, :gpr) |
| list << Instruction.new(codeOrigin, "move", [offset, tmp]) |
| list << Instruction.new(codeOrigin, "addp", [base, tmp]) |
| Address.new(codeOrigin, tmp, Immediate.new(codeOrigin, 0)) |
| end |
| end |
| |
| class BaseIndex |
| def riscLowerMalformedAddressesRecurse(list, node, &block) |
| return self if yield node, self |
| |
| tmp = Tmp.new(codeOrigin, :gpr) |
| list << Instruction.new(codeOrigin, "leap", [BaseIndex.new(codeOrigin, base, index, scale, Immediate.new(codeOrigin, 0)), tmp]) |
| Address.new(codeOrigin, tmp, offset).riscLowerMalformedAddressesRecurse(list, node, &block) |
| end |
| end |
| |
| class AbsoluteAddress |
| def riscLowerMalformedAddressesRecurse(list, node) |
| return self if yield node, self |
| |
| tmp = Tmp.new(codeOrigin, :gpr) |
| list << Instruction.new(codeOrigin, "move", [address, tmp]) |
| Address.new(codeOrigin, tmp, Immediate.new(codeOrigin, 0)) |
| end |
| end |
| |
| def riscLowerMalformedAddresses(list, &block) |
| newList = [] |
| list.each { |
| | node | |
| newList << node.riscLowerMalformedAddressesRecurse(newList, node, &block) |
| } |
| newList |
| end |
| |
| # |
| # Lowering of malformed addresses in double loads and stores. For example: |
| # |
| # loadd [foo, bar, 8], baz |
| # |
| # becomes: |
| # |
| # leap [foo, bar, 8], tmp |
| # loadd [tmp], baz |
| # |
| |
| class Node |
| def riscDoubleAddress(list) |
| self |
| end |
| end |
| |
| class BaseIndex |
| def riscDoubleAddress(list) |
| tmp = Tmp.new(codeOrigin, :gpr) |
| list << Instruction.new(codeOrigin, "leap", [self, tmp]) |
| Address.new(codeOrigin, tmp, Immediate.new(codeOrigin, 0)) |
| end |
| end |
| |
| def riscLowerMalformedAddressesDouble(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| case node.opcode |
| when "loadd" |
| newList << Instruction.new(node.codeOrigin, "loadd", [node.operands[0].riscDoubleAddress(newList), node.operands[1]], node.annotation) |
| when "stored" |
| newList << Instruction.new(node.codeOrigin, "stored", [node.operands[0], node.operands[1].riscDoubleAddress(newList)], node.annotation) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of misplaced immediates. For example: |
| # |
| # storei 0, [foo] |
| # |
| # will become: |
| # |
| # move 0, tmp |
| # storei tmp, [foo] |
| # |
| |
| def riscLowerMisplacedImmediates(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| case node.opcode |
| when "storeb", "storei", "storep" |
| operands = node.operands |
| newOperands = [] |
| operands.each { |
| | operand | |
| if operand.is_a? Immediate |
| tmp = Tmp.new(operand.codeOrigin, :gpr) |
| newList << Instruction.new(operand.codeOrigin, "move", [operand, tmp]) |
| newOperands << tmp |
| else |
| newOperands << operand |
| end |
| } |
| newList << Instruction.new(node.codeOrigin, node.opcode, newOperands, node.annotation) |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of malformed immediates except when used in a "move" instruction. |
| # For example: |
| # |
| # addp 642641, foo |
| # |
| # will become: |
| # |
| # move 642641, tmp |
| # addp tmp, foo |
| # |
| |
| class Node |
| def riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| mapChildren { |
| | node | |
| node.riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| } |
| end |
| end |
| |
| class Address |
| def riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| self |
| end |
| end |
| |
| class BaseIndex |
| def riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| self |
| end |
| end |
| |
| class AbsoluteAddress |
| def riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| self |
| end |
| end |
| |
| class Immediate |
| def riscLowerMalformedImmediatesRecurse(list, validImmediates) |
| unless validImmediates.include? value |
| tmp = Tmp.new(codeOrigin, :gpr) |
| list << Instruction.new(codeOrigin, "move", [self, tmp]) |
| tmp |
| else |
| self |
| end |
| end |
| end |
| |
| def riscLowerMalformedImmediates(list, validImmediates) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| annotation = node.annotation |
| case node.opcode |
| when "move" |
| newList << node |
| when "addi", "addp", "addis", "subi", "subp", "subis" |
| if node.operands[0].is_a? Immediate and |
| (not validImmediates.include? node.operands[0].value) and |
| validImmediates.include? -node.operands[0].value |
| node.operands.size == 2 |
| if node.opcode =~ /add/ |
| newOpcode = "sub" + $~.post_match |
| else |
| newOpcode = "add" + $~.post_match |
| end |
| newList << Instruction.new(node.codeOrigin, newOpcode, |
| [Immediate.new(node.codeOrigin, -node.operands[0].value)] + node.operands[1..-1], |
| annotation) |
| else |
| newList << node.riscLowerMalformedImmediatesRecurse(newList, validImmediates) |
| end |
| when "muli", "mulp" |
| if node.operands[0].is_a? Immediate |
| tmp = Tmp.new(codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "move", [node.operands[0], tmp], annotation) |
| newList << Instruction.new(node.codeOrigin, node.opcode, [tmp] + node.operands[1..-1]) |
| else |
| newList << node.riscLowerMalformedImmediatesRecurse(newList, validImmediates) |
| end |
| else |
| newList << node.riscLowerMalformedImmediatesRecurse(newList, validImmediates) |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of misplaced addresses. For example: |
| # |
| # addi foo, [bar] |
| # |
| # will become: |
| # |
| # loadi [bar], tmp |
| # addi foo, tmp |
| # storei tmp, [bar] |
| # |
| # Another example: |
| # |
| # addi [foo], bar |
| # |
| # will become: |
| # |
| # loadi [foo], tmp |
| # addi tmp, bar |
| # |
| |
| def riscAsRegister(preList, postList, operand, suffix, needStore) |
| return operand unless operand.address? |
| |
| tmp = Tmp.new(operand.codeOrigin, if suffix == "d" then :fpr else :gpr end) |
| preList << Instruction.new(operand.codeOrigin, "load" + suffix, [operand, tmp]) |
| if needStore |
| postList << Instruction.new(operand.codeOrigin, "store" + suffix, [tmp, operand]) |
| end |
| tmp |
| end |
| |
| def riscAsRegisters(preList, postList, operands, suffix) |
| newOperands = [] |
| operands.each_with_index { |
| | operand, index | |
| newOperands << riscAsRegister(preList, postList, operand, suffix, index == operands.size - 1) |
| } |
| newOperands |
| end |
| |
| def riscLowerMisplacedAddresses(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| postInstructions = [] |
| annotation = node.annotation |
| case node.opcode |
| when "addi", "addis", "andi", "lshifti", "muli", "negi", "noti", "ori", "oris", |
| "rshifti", "urshifti", "subi", "subis", "xori", /^bi/, /^bti/, /^ci/, /^ti/ |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, postInstructions, node.operands, "i"), |
| annotation) |
| when "addp", "andp", "lshiftp", "mulp", "negp", "orp", "rshiftp", "urshiftp", |
| "subp", "xorp", /^bp/, /^btp/, /^cp/ |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, postInstructions, node.operands, "p"), |
| annotation) |
| when "bbeq", "bbneq", "bba", "bbaeq", "bbb", "bbbeq", "btbz", "btbnz", "tbz", "tbnz", |
| "cbeq", "cbneq", "cba", "cbaeq", "cbb", "cbbeq" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, postInstructions, node.operands, "b"), |
| annotation) |
| when "bbgt", "bbgteq", "bblt", "bblteq", "btbs", "tbs", "cbgt", "cbgteq", "cblt", "cblteq" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, postInstructions, node.operands, "bs"), |
| annotation) |
| when "addd", "divd", "subd", "muld", "sqrtd", /^bd/ |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| riscAsRegisters(newList, postInstructions, node.operands, "d"), |
| annotation) |
| when "jmp", "call" |
| newList << Instruction.new(node.codeOrigin, |
| node.opcode, |
| [riscAsRegister(newList, postInstructions, node.operands[0], "p", false)], |
| annotation) |
| else |
| newList << node |
| end |
| newList += postInstructions |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
| # |
| # Lowering of register reuse in compare instructions. For example: |
| # |
| # cieq t0, t1, t0 |
| # |
| # will become: |
| # |
| # mov tmp, t0 |
| # cieq tmp, t1, t0 |
| # |
| |
| def riscLowerRegisterReuse(list) |
| newList = [] |
| list.each { |
| | node | |
| if node.is_a? Instruction |
| annotation = node.annotation |
| case node.opcode |
| when "cieq", "cineq", "cia", "ciaeq", "cib", "cibeq", "cigt", "cigteq", "cilt", "cilteq", |
| "cpeq", "cpneq", "cpa", "cpaeq", "cpb", "cpbeq", "cpgt", "cpgteq", "cplt", "cplteq", |
| "tis", "tiz", "tinz", "tbs", "tbz", "tbnz", "tps", "tpz", "tpnz", "cbeq", "cbneq", |
| "cba", "cbaeq", "cbb", "cbbeq", "cbgt", "cbgteq", "cblt", "cblteq" |
| if node.operands.size == 2 |
| if node.operands[0] == node.operands[1] |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "move", [node.operands[0], tmp], annotation) |
| newList << Instruction.new(node.codeOrigin, node.opcode, [tmp, node.operands[1]]) |
| else |
| newList << node |
| end |
| else |
| raise "Wrong number of arguments at #{node.codeOriginString}" unless node.operands.size == 3 |
| if node.operands[0] == node.operands[2] |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "move", [node.operands[0], tmp], annotation) |
| newList << Instruction.new(node.codeOrigin, node.opcode, [tmp, node.operands[1], node.operands[2]]) |
| elsif node.operands[1] == node.operands[2] |
| tmp = Tmp.new(node.codeOrigin, :gpr) |
| newList << Instruction.new(node.codeOrigin, "move", [node.operands[1], tmp], annotation) |
| newList << Instruction.new(node.codeOrigin, node.opcode, [node.operands[0], tmp, node.operands[2]]) |
| else |
| newList << node |
| end |
| end |
| else |
| newList << node |
| end |
| else |
| newList << node |
| end |
| } |
| newList |
| end |
| |
