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

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 52d61367a49c3c63a6732626cf92ada2ba4bc795..796fd58d7a24a2dbe7f075824cf58a4d7c243f26 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -822,12 +822,16 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
               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));
@@ -873,12 +877,16 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       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));