1 files changed, 152 insertions, 0 deletions
diff --git a/js/src/jit/mips32/MoveEmitter-mips32.cpp b/js/src/jit/mips32/MoveEmitter-mips32.cpp
new file mode 100644
index 0000000000..2f52c73899
--- /dev/null
+++ b/js/src/jit/mips32/MoveEmitter-mips32.cpp
@@ -0,0 +1,152 @@
+/* -*- 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/mips32/MoveEmitter-mips32.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+void MoveEmitterMIPS::breakCycle(const MoveOperand& from, const MoveOperand& to,
+                                 MoveOp::Type type, uint32_t slotId) {
+  // There is some pattern:
+  //   (A -> B)
+  //   (B -> A)
+  //
+  // This case handles (A -> B), which we reach first. We save B, then allow
+  // the original move to continue.
+  switch (type) {
+    case MoveOp::FLOAT32:
+      if (to.isMemory()) {
+        FloatRegister temp = ScratchFloat32Reg;
+        masm.loadFloat32(getAdjustedAddress(to), temp);
+        // Since it is uncertain if the load will be aligned or not
+        // just fill both of them with the same value.
+        masm.storeFloat32(temp, cycleSlot(slotId, 0));
+        masm.storeFloat32(temp, cycleSlot(slotId, 4));
+      } else {
+        // Just always store the largest possible size.
+        masm.storeDouble(to.floatReg().doubleOverlay(), cycleSlot(slotId, 0));
+      }
+      break;
+    case MoveOp::DOUBLE:
+      if (to.isMemory()) {
+        FloatRegister temp = ScratchDoubleReg;
+        masm.loadDouble(getAdjustedAddress(to), temp);
+        masm.storeDouble(temp, cycleSlot(slotId, 0));
+      } else {
+        masm.storeDouble(to.floatReg(), cycleSlot(slotId, 0));
+      }
+      break;
+    case MoveOp::INT32:
+      MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
+      [[fallthrough]];
+    case MoveOp::GENERAL:
+      if (to.isMemory()) {
+        Register temp = tempReg();
+        masm.loadPtr(getAdjustedAddress(to), temp);
+        masm.storePtr(temp, cycleSlot(0, 0));
+      } else {
+        // Second scratch register should not be moved by MoveEmitter.
+        MOZ_ASSERT(to.reg() != spilledReg_);
+        masm.storePtr(to.reg(), cycleSlot(0, 0));
+      }
+      break;
+    default:
+      MOZ_CRASH("Unexpected move type");
+  }
+}
+
+void MoveEmitterMIPS::completeCycle(const MoveOperand& from,
+                                    const MoveOperand& to, MoveOp::Type type,
+                                    uint32_t slotId) {
+  // There is some pattern:
+  //   (A -> B)
+  //   (B -> A)
+  //
+  // This case handles (B -> A), which we reach last. We emit a move from the
+  // saved value of B, to A.
+  switch (type) {
+    case MoveOp::FLOAT32:
+      if (to.isMemory()) {
+        FloatRegister temp = ScratchFloat32Reg;
+        masm.loadFloat32(cycleSlot(slotId, 0), temp);
+        masm.storeFloat32(temp, getAdjustedAddress(to));
+      } else {
+        uint32_t offset = 0;
+        if (from.floatReg().numAlignedAliased() == 1) {
+          offset = sizeof(float);
+        }
+        masm.loadFloat32(cycleSlot(slotId, offset), to.floatReg());
+      }
+      break;
+    case MoveOp::DOUBLE:
+      if (to.isMemory()) {
+        FloatRegister temp = ScratchDoubleReg;
+        masm.loadDouble(cycleSlot(slotId, 0), temp);
+        masm.storeDouble(temp, getAdjustedAddress(to));
+      } else {
+        masm.loadDouble(cycleSlot(slotId, 0), to.floatReg());
+      }
+      break;
+    case MoveOp::INT32:
+      MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
+      [[fallthrough]];
+    case MoveOp::GENERAL:
+      MOZ_ASSERT(slotId == 0);
+      if (to.isMemory()) {
+        Register temp = tempReg();
+        masm.loadPtr(cycleSlot(0, 0), temp);
+        masm.storePtr(temp, getAdjustedAddress(to));
+      } else {
+        // Second scratch register should not be moved by MoveEmitter.
+        MOZ_ASSERT(to.reg() != spilledReg_);
+        masm.loadPtr(cycleSlot(0, 0), to.reg());
+      }
+      break;
+    default:
+      MOZ_CRASH("Unexpected move type");
+  }
+}
+
+void MoveEmitterMIPS::emitDoubleMove(const MoveOperand& from,
+                                     const MoveOperand& to) {
+  if (from.isFloatReg()) {
+    if (to.isFloatReg()) {
+      masm.moveDouble(from.floatReg(), to.floatReg());
+    } else if (to.isGeneralRegPair()) {
+      // Used for passing double parameter in a2,a3 register pair.
+      // Two moves are added for one double parameter by
+      // MacroAssembler::passABIArg
+      MOZ_ASSERT(to.evenReg() == a2 && to.oddReg() == a3,
+                 "Invalid emitDoubleMove arguments.");
+      masm.moveFromDoubleLo(from.floatReg(), a2);
+      masm.moveFromDoubleHi(from.floatReg(), a3);
+    } else {
+      MOZ_ASSERT(to.isMemory());
+      masm.storeDouble(from.floatReg(), getAdjustedAddress(to));
+    }
+  } else if (to.isFloatReg()) {
+    MOZ_ASSERT(from.isMemory());
+    masm.loadDouble(getAdjustedAddress(from), to.floatReg());
+  } else if (to.isGeneralRegPair()) {
+    // Used for passing double parameter in a2,a3 register pair.
+    // Two moves are added for one double parameter by
+    // MacroAssembler::passABIArg
+    MOZ_ASSERT(from.isMemory());
+    MOZ_ASSERT(to.evenReg() == a2 && to.oddReg() == a3,
+               "Invalid emitDoubleMove arguments.");
+    masm.loadPtr(getAdjustedAddress(from), a2);
+    masm.loadPtr(
+        Address(from.base(), getAdjustedOffset(from) + sizeof(uint32_t)), a3);
+  } else {
+    MOZ_ASSERT(from.isMemory());
+    MOZ_ASSERT(to.isMemory());
+    masm.loadDouble(getAdjustedAddress(from), ScratchDoubleReg);
+    masm.storeDouble(ScratchDoubleReg, getAdjustedAddress(to));
+  }
+}