[turbofan] Improve code generation for unordered comparisons.

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 ac4e4010b547da55f805f67e813bc19930a8a863..06b934f660a65032f1a0736960c483a4b3800fdc 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1042,27 +1042,15 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
     case kSignedGreaterThan:
       __ j(greater, tlabel);
       break;
-    case kUnorderedLessThan:
-      __ j(parity_even, flabel, flabel_distance);
-    // Fall through.
     case kUnsignedLessThan:
       __ j(below, tlabel);
       break;
-    case kUnorderedGreaterThanOrEqual:
-      __ j(parity_even, tlabel);
-    // Fall through.
     case kUnsignedGreaterThanOrEqual:
       __ j(above_equal, tlabel);
       break;
-    case kUnorderedLessThanOrEqual:
-      __ j(parity_even, flabel, flabel_distance);
-    // Fall through.
     case kUnsignedLessThanOrEqual:
       __ j(below_equal, tlabel);
       break;
-    case kUnorderedGreaterThan:
-      __ j(parity_even, tlabel);
-    // Fall through.
     case kUnsignedGreaterThan:
       __ j(above, tlabel);
       break;
@@ -1123,35 +1111,15 @@ void CodeGenerator::AssembleArchBoolean(Instruction* instr,
     case kSignedGreaterThan:
       cc = greater;
       break;
-    case kUnorderedLessThan:
-      __ j(parity_odd, &check, Label::kNear);
-      __ movl(reg, Immediate(0));
-      __ jmp(&done, Label::kNear);
-    // Fall through.
     case kUnsignedLessThan:
       cc = below;
       break;
-    case kUnorderedGreaterThanOrEqual:
-      __ j(parity_odd, &check, Label::kNear);
-      __ movl(reg, Immediate(1));
-      __ jmp(&done, Label::kNear);
-    // Fall through.
     case kUnsignedGreaterThanOrEqual:
       cc = above_equal;
       break;
-    case kUnorderedLessThanOrEqual:
-      __ j(parity_odd, &check, Label::kNear);
-      __ movl(reg, Immediate(0));
-      __ jmp(&done, Label::kNear);
-    // Fall through.
     case kUnsignedLessThanOrEqual:
       cc = below_equal;
       break;
-    case kUnorderedGreaterThan:
-      __ j(parity_odd, &check, Label::kNear);
-      __ movl(reg, Immediate(1));
-      __ jmp(&done, Label::kNear);
-    // Fall through.
     case kUnsignedGreaterThan:
       cc = above;
       break;