MIPS64: Add support for architecture revision 6.

src/mips64/code-stubs-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 998 matching lines @@
   Label nan;
   __ li(a4, Operand(LESS));
   __ li(a5, Operand(GREATER));
   __ li(a6, Operand(EQUAL));
 
   // Check if either rhs or lhs is NaN.
   __ BranchF(NULL, &nan, eq, f12, f14);
 
   // Check if LESS condition is satisfied. If true, move conditionally
   // result to v0.
-  __ c(OLT, D, f12, f14);
-  __ Movt(v0, a4);
-  // Use previous check to store conditionally to v0 oposite condition
-  // (GREATER). If rhs is equal to lhs, this will be corrected in next
-  // check.
-  __ Movf(v0, a5);
-  // Check if EQUAL condition is satisfied. If true, move conditionally
-  // result to v0.
-  __ c(EQ, D, f12, f14);
-  __ Movt(v0, a6);
+  if (kArchVariant != kMips64r6) {
+    __ c(OLT, D, f12, f14);
+    __ Movt(v0, a4);
+    // Use previous check to store conditionally to v0 oposite condition
+    // (GREATER). If rhs is equal to lhs, this will be corrected in next
+    // check.
+    __ Movf(v0, a5);
+    // Check if EQUAL condition is satisfied. If true, move conditionally
+    // result to v0.
+    __ c(EQ, D, f12, f14);
+    __ Movt(v0, a6);
+  } else {
+    Label skip;
+    __ BranchF(USE_DELAY_SLOT, &skip, NULL, lt, f12, f14);
+    __ mov(v0, a4);  // Return LESS as result.
 
+    __ BranchF(USE_DELAY_SLOT, &skip, NULL, eq, f12, f14);
+    __ mov(v0, a6);  // Return EQUAL as result.
+
+    __ mov(v0, a5);  // Return GREATER as result.
+    __ bind(&skip);
+  }
   __ Ret();
 
   __ bind(&nan);
   // NaN comparisons always fail.
   // Load whatever we need in v0 to make the comparison fail.
   ASSERT(is_int16(GREATER) && is_int16(LESS));
   __ Ret(USE_DELAY_SLOT);
   if (cc == lt || cc == le) {
     __ li(v0, Operand(GREATER));
   } else {
@@ skipping 4259 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64