Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and

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

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index de9710323b6d9b3d4800d46352a1b9bf96ffe22b..5a54e5637e9ad91d19a5e2d09e5a799b80dcc82d 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -407,6 +407,24 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ sqrtsd(i.OutputDoubleRegister(), i.InputOperand(0));
       }
       break;
+    case kSSEFloat64Floor: {
+      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);
+      break;
+    }
     case kSSECvtss2sd:
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ cvtss2sd(i.OutputDoubleRegister(), i.InputDoubleRegister(0));