--- a/hotspot/src/cpu/sparc/vm/c1_LIRAssembler_sparc.cpp	Thu Apr 08 10:55:40 2010 +0200
+++ b/hotspot/src/cpu/sparc/vm/c1_LIRAssembler_sparc.cpp	Thu Apr 08 12:13:07 2010 -0700
@@ -1728,9 +1728,13 @@
       ShouldNotReachHere();
     }
   } else if (code == lir_cmp_l2i) {
+#ifdef _LP64
+    __ lcmp(left->as_register_lo(), right->as_register_lo(), dst->as_register());
+#else
     __ lcmp(left->as_register_hi(),  left->as_register_lo(),
             right->as_register_hi(), right->as_register_lo(),
             dst->as_register());
+#endif
   } else {
     ShouldNotReachHere();
   }

--- a/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Thu Apr 08 10:55:40 2010 +0200
+++ b/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Thu Apr 08 12:13:07 2010 -0700
@@ -3365,6 +3365,13 @@
 
 #else // LP64
 
+void Assembler::set_byte_if_not_zero(Register dst) {
+  int enc = prefix_and_encode(dst->encoding(), true);
+  emit_byte(0x0F);
+  emit_byte(0x95);
+  emit_byte(0xE0 | enc);
+}
+
 // 64bit only pieces of the assembler
 // This should only be used by 64bit instructions that can use rip-relative
 // it cannot be used by instructions that want an immediate value.

--- a/hotspot/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Thu Apr 08 10:55:40 2010 +0200
+++ b/hotspot/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Thu Apr 08 12:13:07 2010 -0700
@@ -2690,19 +2690,14 @@
   } else {
     assert(code == lir_cmp_l2i, "check");
 #ifdef _LP64
-      Register dest = dst->as_register();
-      __ xorptr(dest, dest);
-      Label high, done;
-      __ cmpptr(left->as_register_lo(), right->as_register_lo());
-      __ jcc(Assembler::equal, done);
-      __ jcc(Assembler::greater, high);
-      __ decrement(dest);
-      __ jmp(done);
-      __ bind(high);
-      __ increment(dest);
-
-      __ bind(done);
-
+    Label done;
+    Register dest = dst->as_register();
+    __ cmpptr(left->as_register_lo(), right->as_register_lo());
+    __ movl(dest, -1);
+    __ jccb(Assembler::less, done);
+    __ set_byte_if_not_zero(dest);
+    __ movzbl(dest, dest);
+    __ bind(done);
 #else
     __ lcmp2int(left->as_register_hi(),
                 left->as_register_lo(),

--- a/hotspot/src/share/vm/c1/c1_LinearScan.cpp	Thu Apr 08 10:55:40 2010 +0200
+++ b/hotspot/src/share/vm/c1/c1_LinearScan.cpp	Thu Apr 08 12:13:07 2010 -0700
@@ -2608,12 +2608,17 @@
     } else if (opr->is_double_xmm()) {
       assert(opr->fpu_regnrLo() == opr->fpu_regnrHi(), "assumed in calculation");
       VMReg rname_first  = opr->as_xmm_double_reg()->as_VMReg();
+#  ifdef _LP64
+      first = new LocationValue(Location::new_reg_loc(Location::dbl, rname_first));
+      second = &_int_0_scope_value;
+#  else
       first = new LocationValue(Location::new_reg_loc(Location::normal, rname_first));
       // %%% This is probably a waste but we'll keep things as they were for now
       if (true) {
         VMReg rname_second = rname_first->next();
         second = new LocationValue(Location::new_reg_loc(Location::normal, rname_second));
       }
+#  endif
 #endif
 
     } else if (opr->is_double_fpu()) {
@@ -2639,13 +2644,17 @@
 #endif
 
       VMReg rname_first = frame_map()->fpu_regname(opr->fpu_regnrHi());
-
+#ifdef _LP64
+      first = new LocationValue(Location::new_reg_loc(Location::dbl, rname_first));
+      second = &_int_0_scope_value;
+#else
       first = new LocationValue(Location::new_reg_loc(Location::normal, rname_first));
       // %%% This is probably a waste but we'll keep things as they were for now
       if (true) {
         VMReg rname_second = rname_first->next();
         second = new LocationValue(Location::new_reg_loc(Location::normal, rname_second));
       }
+#endif
 
     } else {
       ShouldNotReachHere();