Version 2.3.6

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index ad22cd940ac5a1ad1851880cf04acc3e206b5adb..9c25ccde2f8cd52e6f5b9f85162715e1e35631c3 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -1728,6 +1728,34 @@ void MacroAssembler::AllocateHeapNumberWithValue(Register result,
 }
 
 
+// Copies a fixed number of fields of heap objects from src to dst.
+void MacroAssembler::CopyFields(Register dst,
+                                Register src,
+                                RegList temps,
+                                int field_count) {
+  // At least one bit set in the first 15 registers.
+  ASSERT((temps & ((1 << 15) - 1)) != 0);
+  ASSERT((temps & dst.bit()) == 0);
+  ASSERT((temps & src.bit()) == 0);
+  // Primitive implementation using only one temporary register.
+
+  Register tmp = no_reg;
+  // Find a temp register in temps list.
+  for (int i = 0; i < 15; i++) {
+    if ((temps & (1 << i)) != 0) {
+      tmp.set_code(i);
+      break;
+    }
+  }
+  ASSERT(!tmp.is(no_reg));
+
+  for (int i = 0; i < field_count; i++) {
+    ldr(tmp, FieldMemOperand(src, i * kPointerSize));
+    str(tmp, FieldMemOperand(dst, i * kPointerSize));
+  }
+}
+
+
 void MacroAssembler::CountLeadingZeros(Register zeros,   // Answer.
                                        Register source,  // Input.
                                        Register scratch) {