[turbofan] Unify Math.floor / Math.ceil optimization.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/scopes.h"
@@ skipping 730 matching lines @@
       __ addq(rsp, Immediate(kDoubleSize));
       break;
     }
     case kSSEFloat64Sqrt:
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ sqrtsd(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       } else {
         __ sqrtsd(i.OutputDoubleRegister(), i.InputOperand(0));
       }
       break;
-    case kSSEFloat64Floor: {
+    case kSSEFloat64Round: {
       CpuFeatureScope sse_scope(masm(), SSE4_1);
-      __ roundsd(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
-                 v8::internal::Assembler::kRoundDown);
-      break;
-    }
-    case kSSEFloat64Ceil: {
-      CpuFeatureScope sse_scope(masm(), SSE4_1);
-      __ roundsd(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
-                 v8::internal::Assembler::kRoundUp);
-      break;
-    }
-    case kSSEFloat64RoundTruncate: {
-      CpuFeatureScope sse_scope(masm(), SSE4_1);
-      __ roundsd(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
-                 v8::internal::Assembler::kRoundToZero);
+      RoundingMode const mode =
+          static_cast<RoundingMode>(MiscField::decode(instr->opcode()));
+      __ roundsd(i.OutputDoubleRegister(), i.InputDoubleRegister(0), mode);
       break;
     }
     case kSSECvtss2sd:
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ cvtss2sd(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       } else {
         __ cvtss2sd(i.OutputDoubleRegister(), i.InputOperand(0));
       }
       break;
     case kSSECvtsd2ss:
@@ skipping 715 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8