[turbofan] Implemented the optional Float32RoundTruncate operator.

test/cctest/test-assembler-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1876 matching lines @@
   Handle<Code> code = isolate->factory()->NewCode(
       desc, Code::ComputeFlags(Code::STUB), code_object);
   F1 f = FUNCTION_CAST<F1>(code->entry());
   int res =
       reinterpret_cast<int>(CALL_GENERATED_CODE(isolate, f, 21, 0, 0, 0, 0));
   ::printf("f() = %d\n", res);
   CHECK_EQ(42, res);
 }
 
 
+TEST(ARMv8_float32_vrintX) {
+  // Test the vrintX floating point instructions.
+  CcTest::InitializeVM();
+  Isolate* isolate = CcTest::i_isolate();
+  HandleScope scope(isolate);
+
+  typedef struct {
+    float input;
+    float ar;
+    float nr;
+    float mr;
+    float pr;
+    float zr;
+  } T;
+  T t;
+
+  // Create a function that accepts &t, and loads, manipulates, and stores
+  // the floats.
+  Assembler assm(isolate, NULL, 0);
+  Label L, C;
+
+
+  if (CpuFeatures::IsSupported(ARMv8)) {
+    CpuFeatureScope scope(&assm, ARMv8);
+
+    __ mov(ip, Operand(sp));
+    __ stm(db_w, sp, r4.bit() | fp.bit() | lr.bit());
+
+    __ mov(r4, Operand(r0));
+
+    // Test vrinta
+    __ vldr(s6, r4, offsetof(T, input));
+    __ vrinta(s5, s6);
+    __ vstr(s5, r4, offsetof(T, ar));
+
+    // Test vrintn
+    __ vldr(s6, r4, offsetof(T, input));
+    __ vrintn(s5, s6);
+    __ vstr(s5, r4, offsetof(T, nr));
+
+    // Test vrintp
+    __ vldr(s6, r4, offsetof(T, input));
+    __ vrintp(s5, s6);
+    __ vstr(s5, r4, offsetof(T, pr));
+
+    // Test vrintm
+    __ vldr(s6, r4, offsetof(T, input));
+    __ vrintm(s5, s6);
+    __ vstr(s5, r4, offsetof(T, mr));
+
+    // Test vrintz
+    __ vldr(s6, r4, offsetof(T, input));
+    __ vrintz(s5, s6);
+    __ vstr(s5, r4, offsetof(T, zr));
+
+    __ ldm(ia_w, sp, r4.bit() | fp.bit() | pc.bit());
+
+    CodeDesc desc;
+    assm.GetCode(&desc);
+    Handle<Code> code = isolate->factory()->NewCode(
+        desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
+#ifdef DEBUG
+    OFStream os(stdout);
+    code->Print(os);
+#endif
+    F3 f = FUNCTION_CAST<F3>(code->entry());
+
+    Object* dummy = nullptr;
+    USE(dummy);
+
+#define CHECK_VRINT(input_val, ares, nres, mres, pres, zres) \
+  t.input = input_val;                                       \
+  dummy = CALL_GENERATED_CODE(isolate, f, &t, 0, 0, 0, 0);   \
+  CHECK_EQ(ares, t.ar);                                      \
+  CHECK_EQ(nres, t.nr);                                      \
+  CHECK_EQ(mres, t.mr);                                      \
+  CHECK_EQ(pres, t.pr);                                      \
+  CHECK_EQ(zres, t.zr);
+
+    CHECK_VRINT(-0.5, -1.0, -0.0, -1.0, -0.0, -0.0)
+    CHECK_VRINT(-0.6, -1.0, -1.0, -1.0, -0.0, -0.0)
+    CHECK_VRINT(-1.1, -1.0, -1.0, -2.0, -1.0, -1.0)
+    CHECK_VRINT(0.5, 1.0, 0.0, 0.0, 1.0, 0.0)
+    CHECK_VRINT(0.6, 1.0, 1.0, 0.0, 1.0, 0.0)
+    CHECK_VRINT(1.1, 1.0, 1.0, 1.0, 2.0, 1.0)
+    float inf = std::numeric_limits<float>::infinity();
+    CHECK_VRINT(inf, inf, inf, inf, inf, inf)
+    CHECK_VRINT(-inf, -inf, -inf, -inf, -inf, -inf)
+    CHECK_VRINT(-0.0, -0.0, -0.0, -0.0, -0.0, -0.0)
+
+    // Check NaN propagation.
+    float nan = std::numeric_limits<float>::quiet_NaN();
+    t.input = nan;
+    dummy = CALL_GENERATED_CODE(isolate, f, &t, 0, 0, 0, 0);
+    CHECK_EQ(bit_cast<int32_t>(nan), bit_cast<int32_t>(t.ar));
+    CHECK_EQ(bit_cast<int32_t>(nan), bit_cast<int32_t>(t.nr));
+    CHECK_EQ(bit_cast<int32_t>(nan), bit_cast<int32_t>(t.mr));
+    CHECK_EQ(bit_cast<int32_t>(nan), bit_cast<int32_t>(t.pr));
+    CHECK_EQ(bit_cast<int32_t>(nan), bit_cast<int32_t>(t.zr));
+
+#undef CHECK_VRINT
+  }
+}
+
+
 TEST(ARMv8_vrintX) {
   // Test the vrintX floating point instructions.
   CcTest::InitializeVM();
   Isolate* isolate = CcTest::i_isolate();
   HandleScope scope(isolate);
 
   typedef struct {
     double input;
     double ar;
     double nr;
@@ skipping 143 matching lines @@
   HandleScope scope(isolate);
 
   Assembler assm(isolate, NULL, 0);
   __ mov(r0, Operand(isolate->factory()->infinity_value()));
   __ BlockConstPoolFor(1019);
   for (int i = 0; i < 1019; ++i) __ nop();
   __ vldr(d0, MemOperand(r0, 0));
 }
 
 #undef __