diff options
Diffstat (limited to 'js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp')
| -rw-r--r-- | js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp b/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp new file mode 100644 index 0000000000..5ea8f0b8de --- /dev/null +++ b/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp @@ -0,0 +1,207 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "jit/mips-shared/MoveEmitter-mips-shared.h" + +#include "jit/MacroAssembler-inl.h" + +using namespace js; +using namespace js::jit; + +void MoveEmitterMIPSShared::emit(const MoveResolver& moves) { + if (moves.numCycles()) { + // Reserve stack for cycle resolution + static_assert(SpillSlotSize == 8); + masm.reserveStack(moves.numCycles() * SpillSlotSize); + pushedAtCycle_ = masm.framePushed(); + } + + for (size_t i = 0; i < moves.numMoves(); i++) { + emit(moves.getMove(i)); + } +} + +Address MoveEmitterMIPSShared::cycleSlot(uint32_t slot, + uint32_t subslot) const { + int32_t offset = masm.framePushed() - pushedAtCycle_; + MOZ_ASSERT(Imm16::IsInSignedRange(offset)); + return Address(StackPointer, offset + slot * sizeof(double) + subslot); +} + +int32_t MoveEmitterMIPSShared::getAdjustedOffset(const MoveOperand& operand) { + MOZ_ASSERT(operand.isMemoryOrEffectiveAddress()); + if (operand.base() != StackPointer) { + return operand.disp(); + } + + // Adjust offset if stack pointer has been moved. + return operand.disp() + masm.framePushed() - pushedAtStart_; +} + +Address MoveEmitterMIPSShared::getAdjustedAddress(const MoveOperand& operand) { + return Address(operand.base(), getAdjustedOffset(operand)); +} + +Register MoveEmitterMIPSShared::tempReg() { + spilledReg_ = SecondScratchReg; + return SecondScratchReg; +} + +void MoveEmitterMIPSShared::emitMove(const MoveOperand& from, + const MoveOperand& to) { + if (from.isGeneralReg()) { + // Second scratch register should not be moved by MoveEmitter. + MOZ_ASSERT(from.reg() != spilledReg_); + + if (to.isGeneralReg()) { + masm.movePtr(from.reg(), to.reg()); + } else if (to.isMemory()) { + masm.storePtr(from.reg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitMove arguments."); + } + } else if (from.isMemory()) { + if (to.isGeneralReg()) { + masm.loadPtr(getAdjustedAddress(from), to.reg()); + } else if (to.isMemory()) { + masm.loadPtr(getAdjustedAddress(from), tempReg()); + masm.storePtr(tempReg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitMove arguments."); + } + } else if (from.isEffectiveAddress()) { + if (to.isGeneralReg()) { + masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg()); + } else if (to.isMemory()) { + masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg()); + masm.storePtr(tempReg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitMove arguments."); + } + } else { + MOZ_CRASH("Invalid emitMove arguments."); + } +} + +void MoveEmitterMIPSShared::emitInt32Move(const MoveOperand& from, + const MoveOperand& to) { + if (from.isGeneralReg()) { + // Second scratch register should not be moved by MoveEmitter. + MOZ_ASSERT(from.reg() != spilledReg_); + + if (to.isGeneralReg()) { + masm.move32(from.reg(), to.reg()); + } else if (to.isMemory()) { + masm.store32(from.reg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitInt32Move arguments."); + } + } else if (from.isMemory()) { + if (to.isGeneralReg()) { + masm.load32(getAdjustedAddress(from), to.reg()); + } else if (to.isMemory()) { + masm.load32(getAdjustedAddress(from), tempReg()); + masm.store32(tempReg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitInt32Move arguments."); + } + } else if (from.isEffectiveAddress()) { + if (to.isGeneralReg()) { + masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg()); + } else if (to.isMemory()) { + masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg()); + masm.store32(tempReg(), getAdjustedAddress(to)); + } else { + MOZ_CRASH("Invalid emitInt32Move arguments."); + } + } else { + MOZ_CRASH("Invalid emitInt32Move arguments."); + } +} + +void MoveEmitterMIPSShared::emitFloat32Move(const MoveOperand& from, + const MoveOperand& to) { + // Ensure that we can use ScratchFloat32Reg in memory move. + MOZ_ASSERT_IF(from.isFloatReg(), from.floatReg() != ScratchFloat32Reg); + MOZ_ASSERT_IF(to.isFloatReg(), to.floatReg() != ScratchFloat32Reg); + + if (from.isFloatReg()) { + if (to.isFloatReg()) { + masm.moveFloat32(from.floatReg(), to.floatReg()); + } else if (to.isGeneralReg()) { + // This should only be used when passing float parameter in a1,a2,a3 + MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3); + masm.moveFromFloat32(from.floatReg(), to.reg()); + } else { + MOZ_ASSERT(to.isMemory()); + masm.storeFloat32(from.floatReg(), getAdjustedAddress(to)); + } + } else if (to.isFloatReg()) { + MOZ_ASSERT(from.isMemory()); + masm.loadFloat32(getAdjustedAddress(from), to.floatReg()); + } else if (to.isGeneralReg()) { + MOZ_ASSERT(from.isMemory()); + // This should only be used when passing float parameter in a1,a2,a3 + MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3); + masm.loadPtr(getAdjustedAddress(from), to.reg()); + } else { + MOZ_ASSERT(from.isMemory()); + MOZ_ASSERT(to.isMemory()); + masm.loadFloat32(getAdjustedAddress(from), ScratchFloat32Reg); + masm.storeFloat32(ScratchFloat32Reg, getAdjustedAddress(to)); + } +} + +void MoveEmitterMIPSShared::emit(const MoveOp& move) { + const MoveOperand& from = move.from(); + const MoveOperand& to = move.to(); + + if (move.isCycleEnd() && move.isCycleBegin()) { + // A fun consequence of aliased registers is you can have multiple + // cycles at once, and one can end exactly where another begins. + breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot()); + completeCycle(from, to, move.type(), move.cycleEndSlot()); + return; + } + + if (move.isCycleEnd()) { + MOZ_ASSERT(inCycle_); + completeCycle(from, to, move.type(), move.cycleEndSlot()); + MOZ_ASSERT(inCycle_ > 0); + inCycle_--; + return; + } + + if (move.isCycleBegin()) { + breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot()); + inCycle_++; + } + + switch (move.type()) { + case MoveOp::FLOAT32: + emitFloat32Move(from, to); + break; + case MoveOp::DOUBLE: + emitDoubleMove(from, to); + break; + case MoveOp::INT32: + emitInt32Move(from, to); + break; + case MoveOp::GENERAL: + emitMove(from, to); + break; + default: + MOZ_CRASH("Unexpected move type"); + } +} + +void MoveEmitterMIPSShared::assertDone() { MOZ_ASSERT(inCycle_ == 0); } + +void MoveEmitterMIPSShared::finish() { + assertDone(); + + masm.freeStack(masm.framePushed() - pushedAtStart_); +} |