[x86] Use AVX in Crankshaft when available.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index c4e0a9df406396918285493e150328c2ea725962..5d3d11be17d27668355507b42f4321575c9ba31a 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1983,19 +1983,43 @@ void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
   XMMRegister result = ToDoubleRegister(instr->result());
   switch (instr->op()) {
     case Token::ADD:
-      __ addsd(left, right);
+      if (CpuFeatures::IsSupported(AVX)) {
+        CpuFeatureScope scope(masm(), AVX);
+        __ vaddsd(result, left, right);
+      } else {
+        DCHECK(result.is(left));
+        __ addsd(left, right);
+      }
       break;
     case Token::SUB:
-      __ subsd(left, right);
+      if (CpuFeatures::IsSupported(AVX)) {
+        CpuFeatureScope scope(masm(), AVX);
+        __ vsubsd(result, left, right);
+      } else {
+        DCHECK(result.is(left));
+        __ subsd(left, right);
+      }
       break;
     case Token::MUL:
-      __ mulsd(left, right);
+      if (CpuFeatures::IsSupported(AVX)) {
+        CpuFeatureScope scope(masm(), AVX);
+        __ vmulsd(result, left, right);
+      } else {
+        DCHECK(result.is(left));
+        __ mulsd(left, right);
+      }
       break;
     case Token::DIV:
-      __ divsd(left, right);
-      // Don't delete this mov. It may improve performance on some CPUs,
-      // when there is a mulsd depending on the result
-      __ movaps(left, left);
+      if (CpuFeatures::IsSupported(AVX)) {
+        CpuFeatureScope scope(masm(), AVX);
+        __ vdivsd(result, left, right);
+      } else {
+        DCHECK(result.is(left));
+        __ divsd(left, right);
+        // Don't delete this mov. It may improve performance on some CPUs,
+        // when there is a mulsd depending on the result
+        __ movaps(left, left);
+      }
       break;
     case Token::MOD: {
       // Pass two doubles as arguments on the stack.