[arm64] Implement Float(32|64)(Min|Max) using fcsel.

src/compiler/arm64/code-generator-arm64.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/code-generator.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 804 matching lines @@
       break;
     case kArm64Float32Mul:
       __ Fmul(i.OutputFloat32Register(), i.InputFloat32Register(0),
               i.InputFloat32Register(1));
       break;
     case kArm64Float32Div:
       __ Fdiv(i.OutputFloat32Register(), i.InputFloat32Register(0),
               i.InputFloat32Register(1));
       break;
     case kArm64Float32Max:
-      __ Fmax(i.OutputFloat32Register(), i.InputFloat32Register(0),
-              i.InputFloat32Register(1));
+      // (b < a) ? a : b
+      __ Fcmp(i.InputFloat32Register(1), i.InputFloat32Register(0));
+      __ Fcsel(i.OutputFloat32Register(), i.InputFloat32Register(0),
+               i.InputFloat32Register(1), lo);
       break;
     case kArm64Float32Min:
-      __ Fmin(i.OutputFloat32Register(), i.InputFloat32Register(0),
-              i.InputFloat32Register(1));
+      // (a < b) ? a : b
+      __ Fcmp(i.InputFloat32Register(0), i.InputFloat32Register(1));
+      __ Fcsel(i.OutputFloat32Register(), i.InputFloat32Register(0),
+               i.InputFloat32Register(1), lo);
       break;
     case kArm64Float32Abs:
       __ Fabs(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float32Sqrt:
       __ Fsqrt(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
     case kArm64Float64Cmp:
       if (instr->InputAt(1)->IsDoubleRegister()) {
         __ Fcmp(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
@@ skipping 25 matching lines @@
       FrameScope scope(masm(), StackFrame::MANUAL);
       DCHECK(d0.is(i.InputDoubleRegister(0)));
       DCHECK(d1.is(i.InputDoubleRegister(1)));
       DCHECK(d0.is(i.OutputDoubleRegister()));
       // TODO(dcarney): make sure this saves all relevant registers.
       __ CallCFunction(ExternalReference::mod_two_doubles_operation(isolate()),
                        0, 2);
       break;
     }
     case kArm64Float64Max:
-      __ Fmax(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
-              i.InputDoubleRegister(1));
+      // (b < a) ? a : b
+      __ Fcmp(i.InputDoubleRegister(1), i.InputDoubleRegister(0));
+      __ Fcsel(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
+               i.InputDoubleRegister(1), lo);
       break;
     case kArm64Float64Min:
-      __ Fmin(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
-              i.InputDoubleRegister(1));
+      // (a < b) ? a : b
+      __ Fcmp(i.InputDoubleRegister(0), i.InputDoubleRegister(1));
+      __ Fcsel(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
+               i.InputDoubleRegister(1), lo);
       break;
     case kArm64Float64Abs:
       __ Fabs(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64Neg:
       __ Fneg(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64Sqrt:
       __ Fsqrt(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
@@ skipping 557 matching lines @@
       padding_size -= kInstructionSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8