Make X64 double-to-int32 conversion use the 64-bit version of cvttsd2si.

src/ia32/codegen-ia32.cc

Index: src/ia32/codegen-ia32.cc
diff --git a/src/ia32/codegen-ia32.cc b/src/ia32/codegen-ia32.cc
index 74a343bf3930c671a680d30a2dcfa0f4b164ac2e..886377af06f3adfa59344bce33e8196ac62b7ffa 100644
--- a/src/ia32/codegen-ia32.cc
+++ b/src/ia32/codegen-ia32.cc
@@ -10205,6 +10205,14 @@ void IntegerConvert(MacroAssembler* masm,
   Label done, right_exponent, normal_exponent;
   Register scratch = ebx;
   Register scratch2 = edi;
+  if (type_info.IsInteger32() && CpuFeatures::IsEnabled(SSE2)) {
+    if (FLAG_debug_code) {
+      // Do some testing to see that the type info is correct.

[William Hesse, 2010/05/10 11:08:43]

This comment should be a TODO, or it should actually be implemented, or the if
statement should be removed.

[Lasse Reichstein, 2010/05/10 11:20:44]

Removed (I meant to but forgot, well spotted).

+    }
+    CpuFeatures::Scope scope(SSE2);
+    __ cvttsd2si(ecx, FieldOperand(source, HeapNumber::kValueOffset));
+    return;
+  }
   if (!type_info.IsInteger32() || !use_sse3) {
     // Get exponent word.
     __ mov(scratch, FieldOperand(source, HeapNumber::kExponentOffset));