Truncate rather than round to nearest when performing float-to-integer...

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
===================================================================
--- src/x64/assembler-x64.cc	(revision 6302)
+++ src/x64/assembler-x64.cc	(working copy)
@@ -2721,6 +2721,17 @@
 }
 
 

[William Hesse, 2011/01/14 14:58:17]

disasm-x64.cc has an assert on line 1117 that will now fail.  It needs to be
changed, to look like the way disasm-x6 handles cvttsd2si.

[Ken Russell (switch to Gerrit), 2011/01/14 22:37:27]

Done. Tested in 64-bit Chromium with --js-flags="--print_code_stubs" and
verified no assertion failures with the typed array unit tests.

+void Assembler::cvttss2si(Register dst, XMMRegister src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF3);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x2C);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::cvttsd2si(Register dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ -2732,6 +2743,17 @@
 }
 
 
+void Assembler::cvttsd2si(Register dst, XMMRegister src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF2);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x2C);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::cvttsd2siq(Register dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;