[arm64] Optimize fcmp when lhs operand is #0.0

src/compiler/instruction.cc

 // Copyright 2014 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/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/schedule.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+
+FlagsCondition CommuteFlagsCondition(FlagsCondition condition) {
+  switch (condition) {
+    case kSignedLessThan:
+      return kSignedGreaterThan;
+    case kSignedGreaterThanOrEqual:
+      return kSignedLessThanOrEqual;
+    case kSignedLessThanOrEqual:
+      return kSignedGreaterThanOrEqual;
+    case kSignedGreaterThan:
+      return kSignedLessThan;
+    case kUnsignedLessThan:
+      return kUnsignedGreaterThan;
+    case kUnsignedGreaterThanOrEqual:
+      return kUnsignedLessThanOrEqual;
+    case kUnsignedLessThanOrEqual:
+      return kUnsignedGreaterThanOrEqual;
+    case kUnsignedGreaterThan:
+      return kUnsignedLessThan;
+    case kFloatLessThanOrUnordered:
+      return kFloatGreaterThanOrUnordered;
+    case kFloatGreaterThanOrEqual:
+      return kFloatLessThanOrEqual;
+    case kFloatLessThanOrEqual:
+      return kFloatGreaterThanOrEqual;
+    case kFloatGreaterThanOrUnordered:
+      return kFloatLessThanOrUnordered;
+    case kFloatLessThan:
+      return kFloatGreaterThan;
+    case kFloatGreaterThanOrEqualOrUnordered:
+      return kFloatLessThanOrEqualOrUnordered;
+    case kFloatLessThanOrEqualOrUnordered:
+      return kFloatGreaterThanOrEqualOrUnordered;
+    case kFloatGreaterThan:
+      return kFloatLessThan;
+    case kEqual:
+    case kNotEqual:
+    case kOverflow:
+    case kNotOverflow:
+    case kUnorderedEqual:
+    case kUnorderedNotEqual:
+      return condition;
+  }
+  UNREACHABLE();
+  return condition;
+}
+
+
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionOperand& printable) {
   const InstructionOperand& op = printable.op_;
   const RegisterConfiguration* conf = printable.register_configuration_;
   switch (op.kind()) {
     case InstructionOperand::UNALLOCATED: {
       const UnallocatedOperand* unalloc = UnallocatedOperand::cast(&op);
       os << "v" << unalloc->virtual_register();
       if (unalloc->basic_policy() == UnallocatedOperand::FIXED_SLOT) {
         return os << "(=" << unalloc->fixed_slot_index() << "S)";
@@ skipping 269 matching lines @@
     case kSignedGreaterThan:
       return os << "signed greater than";
     case kUnsignedLessThan:
       return os << "unsigned less than";
     case kUnsignedGreaterThanOrEqual:
       return os << "unsigned greater than or equal";
     case kUnsignedLessThanOrEqual:
       return os << "unsigned less than or equal";
     case kUnsignedGreaterThan:
       return os << "unsigned greater than";
+    case kFloatLessThanOrUnordered:
+      return os << "less than or unordered (FP)";
+    case kFloatGreaterThanOrEqual:
+      return os << "greater than or equal (FP)";
+    case kFloatLessThanOrEqual:
+      return os << "less than or equal (FP)";
+    case kFloatGreaterThanOrUnordered:
+      return os << "greater than or unordered (FP)";
+    case kFloatLessThan:
+      return os << "less than (FP)";
+    case kFloatGreaterThanOrEqualOrUnordered:
+      return os << "greater than, equal or unordered (FP)";
+    case kFloatLessThanOrEqualOrUnordered:
+      return os << "less than, equal or unordered (FP)";
+    case kFloatGreaterThan:
+      return os << "greater than (FP)";
     case kUnorderedEqual:
       return os << "unordered equal";
     case kUnorderedNotEqual:
       return os << "unordered not equal";
     case kOverflow:
       return os << "overflow";
     case kNotOverflow:
       return os << "not overflow";
   }
   UNREACHABLE();
@@ skipping 496 matching lines @@
       os << " B" << succ.ToInt();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8