[turbofan] Add Float32(Max|Min) machine operators.

test/cctest/compiler/test-run-machops.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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/ieee754.h"
@@ skipping 3772 matching lines @@
   Float64BinopTester bt(&m);
   bt.AddReturn(m.Float64Min(bt.param0, bt.param1));
 
   FOR_FLOAT64_INPUTS(pl) {
     FOR_FLOAT64_INPUTS(pr) {
       CHECK_DOUBLE_EQ(fmin(*pl, *pr), bt.call(*pl, *pr));
     }
   }
 }
 
+namespace {
+
+float fmax(float x, float y) {

[titzer, 2016/08/17 11:26:09]

Can you move this to a common place so that it can be shared? Also the double
version.

[ahaas, 2016/08/18 07:13:20]

Done.

+  if (std::isnan(x)) return x;
+  if (std::isnan(y)) return y;
+  if (std::signbit(x) < std::signbit(y)) return x;
+  return std::max(x, y);
+}
+
+float fmin(float x, float y) {
+  if (std::isnan(x)) return x;
+  if (std::isnan(y)) return y;
+  if (std::signbit(x) < std::signbit(y)) return y;
+  return std::min(x, y);
+}
+
+}  // namespace
+
+TEST(RunFloat32Max) {
+  RawMachineAssemblerTester<int32_t> m;
+  Float32BinopTester bt(&m);
+  bt.AddReturn(m.Float32Max(bt.param0, bt.param1));
+
+  FOR_FLOAT32_INPUTS(pl) {
+    FOR_FLOAT32_INPUTS(pr) {
+      CHECK_FLOAT_EQ(fmax(*pl, *pr), bt.call(*pl, *pr));
+    }
+  }
+}
+
+TEST(RunFloat32Min) {
+  RawMachineAssemblerTester<int32_t> m;
+  Float32BinopTester bt(&m);
+  bt.AddReturn(m.Float32Min(bt.param0, bt.param1));
+
+  FOR_FLOAT32_INPUTS(pl) {
+    FOR_FLOAT32_INPUTS(pr) {
+      CHECK_FLOAT_EQ(fmin(*pl, *pr), bt.call(*pl, *pr));
+    }
+  }
+}
 
 TEST(RunFloat32SubP) {
   RawMachineAssemblerTester<int32_t> m;
   Float32BinopTester bt(&m);
 
   bt.AddReturn(m.Float32Sub(bt.param0, bt.param1));
 
   FOR_FLOAT32_INPUTS(pl) {
     FOR_FLOAT32_INPUTS(pr) { CHECK_FLOAT_EQ(*pl - *pr, bt.call(*pl, *pr)); }
   }
@@ skipping 2762 matching lines @@
   r.Goto(&merge);
   r.Bind(&merge);
   Node* phi = r.Phi(MachineRepresentation::kWord32, fa, fb);
   r.Return(phi);
   CHECK_EQ(1, r.Call(1));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8