Refactor Math.min/max to be a single HInstruction.

src/x64/lithium-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * 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
@@ skipping 1312 matching lines @@
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::ADD, instr);
   } else {
     ASSERT(instr->representation().IsTagged());
     return DoArithmeticT(Token::ADD, instr);
   }
   return NULL;
 }
 
 
+LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
+  LOperand* left = NULL;
+  LOperand* right = NULL;
+  if (instr->representation().IsInteger32()) {
+    ASSERT(instr->left()->representation().IsInteger32());
+    ASSERT(instr->right()->representation().IsInteger32());
+    left = UseRegisterAtStart(instr->LeastConstantOperand());
+    right = UseOrConstantAtStart(instr->MostConstantOperand());
+  } else {
+    ASSERT(instr->representation().IsDouble());
+    ASSERT(instr->left()->representation().IsDouble());
+    ASSERT(instr->right()->representation().IsDouble());
+    left = UseRegisterAtStart(instr->left());
+    right = UseRegisterAtStart(instr->right());
+  }
+  LMathMinMax* minmax = new(zone()) LMathMinMax(left, right);
+  return DefineSameAsFirst(minmax);
+}
+
+
 LInstruction* LChunkBuilder::DoPower(HPower* instr) {
   ASSERT(instr->representation().IsDouble());
   // We call a C function for double power. It can't trigger a GC.
   // We need to use fixed result register for the call.
   Representation exponent_type = instr->right()->representation();
   ASSERT(instr->left()->representation().IsDouble());
   LOperand* left = UseFixedDouble(instr->left(), xmm2);
   LOperand* right = exponent_type.IsDouble() ?
       UseFixedDouble(instr->right(), xmm1) :
 #ifdef _WIN64
@@ skipping 936 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64