ARM: Avoid VMSR instruction when converting to clamped uint8

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 211 matching lines @@
     double a;
     double b;
     double c;
     double d;
     double e;
     double f;
     double g;
     double h;
     int i;
     double j;
+    unsigned int k;
     double m;
     double n;
     float x;
     float y;
   } T;
   T t;
 
   // Create a function that accepts &t, and loads, manipulates, and stores
   // the doubles and floats.
   Assembler assm(isolate, NULL, 0);
@@ skipping 43 matching lines @@
     __ vcvt_s32_f64(s31, d4);
     __ vstr(s31, r4, OFFSET_OF(T, i));
 
     // Convert from integer to floating point.
     __ mov(lr, Operand(42));
     __ vmov(s31, lr);
     __ vcvt_f64_s32(d4, s31);
     __ vstr(d4, r4, OFFSET_OF(T, f));
 
     // Convert from fixed point to floating point.
-    __ mov(lr, Operand(1234));
+    __ mov(lr, Operand(2468));
     __ vmov(s8, lr);
-    __ vcvt_f64_s32(d4, 1);
+    __ vcvt_f64_s32(d4, 2);
     __ vstr(d4, r4, OFFSET_OF(T, j));
 
+    // Convert from floating point to fixed point.
+    __ vmov(d4, 42.25);
+    __ vcvt_u32_f64(d4, 3);
+    __ vstr(d4, r4, OFFSET_OF(T, k));
+
     // Test vabs.
     __ vldr(d1, r4, OFFSET_OF(T, g));
     __ vabs(d0, d1);
     __ vstr(d0, r4, OFFSET_OF(T, g));
     __ vldr(d2, r4, OFFSET_OF(T, h));
     __ vabs(d0, d2);
     __ vstr(d0, r4, OFFSET_OF(T, h));
 
     // Test vneg.
     __ vldr(d1, r4, OFFSET_OF(T, m));
@@ skipping 19 matching lines @@
     t.a = 1.5;
     t.b = 2.75;
     t.c = 17.17;
     t.d = 0.0;
     t.e = 0.0;
     t.f = 0.0;
     t.g = -2718.2818;
     t.h = 31415926.5;
     t.i = 0;
     t.j = 0;
+    t.k = 0;
     t.m = -2718.2818;
     t.n = 123.456;
     t.x = 4.5;
     t.y = 9.0;
     Object* dummy = CALL_GENERATED_CODE(f, &t, 0, 0, 0, 0);
     USE(dummy);
     CHECK_EQ(4.5, t.y);
     CHECK_EQ(9.0, t.x);
     CHECK_EQ(-123.456, t.n);
     CHECK_EQ(2718.2818, t.m);
     CHECK_EQ(2, t.i);
     CHECK_EQ(2718.2818, t.g);
     CHECK_EQ(31415926.5, t.h);
     CHECK_EQ(617.0, t.j);
+    CHECK_EQ(338, t.k);
     CHECK_EQ(42.0, t.f);
     CHECK_EQ(1.0, t.e);
     CHECK_EQ(1.000000059604644775390625, t.d);
     CHECK_EQ(4.25, t.c);
     CHECK_EQ(-4.1875, t.b);
     CHECK_EQ(1.5, t.a);
   }
 }
 
 
@@ skipping 1226 matching lines @@
   Handle<Code> code = isolate->factory()->NewCode(desc,
       Code::ComputeFlags(Code::STUB), code_object);
   CHECK(code->IsCode());
   F1 f = FUNCTION_CAST<F1>(code->entry());
   int res = reinterpret_cast<int>(CALL_GENERATED_CODE(f, 21, 0, 0, 0, 0));
   ::printf("f() = %d\n", res);
   CHECK_EQ(42, res);
 }
 
 #undef __