Bring back the fisttp instruction on machines with SSE3, but check the

input so we don't have to check the exception flags afterwards.
Review URL: http://codereview.chromium.org/509001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3504 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/assembler-ia32.cc

@@ -1675,6 +1675,15 @@ void Assembler::fisttp_s(const Operand& adr) {
 }
 
 
+void Assembler::fisttp_d(const Operand& adr) {
+  ASSERT(CpuFeatures::IsEnabled(SSE3));
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  EMIT(0xDD);
+  emit_operand(ecx, adr);
+}
+
+
 void Assembler::fist_s(const Operand& adr) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;

src/ia32/assembler-ia32.h

@@ -693,6 +693,7 @@ class Assembler : public Malloced {
   void fistp_d(const Operand& adr);
 
   void fisttp_s(const Operand& adr);
+  void fisttp_d(const Operand& adr);
 
   void fabs();
   void fchs();

test/mjsunit/smi-ops.js

@@ -537,7 +537,7 @@ function testShiftNonSmis() {
   one = four - three;
   zero = one - one;
 
- // Begin block A repeat 3
+  // Begin block A repeat 3
   assertEquals(pos_non_smi, (pos_non_smi) >> zero);
   assertEquals(pos_non_smi, (pos_non_smi) >>> zero);
   assertEquals(pos_non_smi, (pos_non_smi) << zero);
@@ -638,6 +638,31 @@ function testShiftNonSmis() {
 
 testShiftNonSmis();
 
+function intConversion() {
+  function foo(x) {
+    assertEquals(x, (x * 1.0000000001) | 0, "foo more " + x);
+    assertEquals(x, x | 0, "foo " + x);
+    if (x > 0) {
+      assertEquals(x - 1, (x * 0.9999999999) | 0, "foo less " + x);
+    } else {
+      assertEquals(x + 1, (x * 0.9999999999) | 0, "foo less " + x);
+    }
+  }
+  for (var i = 1; i < 0x80000000; i *= 2) {
+    foo(i);
+    foo(-i);
+  }
+  for (var i = 1; i < 1/0; i *= 2) {
+    assertEquals(i | 0, (i * 1.0000000000000001) | 0, "b" + i);
+    assertEquals(-i | 0, (i * -1.0000000000000001) | 0, "c" + i);
+  }
+  for (var i = 0.5; i > 0; i /= 2) {
+    assertEquals(0, i | 0, "d" + i);
+    assertEquals(0, -i | 0, "e" + i);
+  }
+}
+
+intConversion();
 
 // Verify that we handle the (optimized) corner case of shifting by
 // zero even for non-smis.