--- a/hotspot/src/cpu/x86/vm/x86_64.ad	Mon May 14 09:36:00 2012 -0700
+++ b/hotspot/src/cpu/x86/vm/x86_64.ad	Tue May 15 10:10:23 2012 +0200
@@ -9823,7 +9823,39 @@
   ins_pipe( pipe_slow );
 %}
 
-
+instruct powD_reg(regD dst, regD src0, regD src1, rax_RegI rax, rdx_RegI rdx, rcx_RegI rcx, rFlagsReg cr) %{
+  match(Set dst (PowD src0 src1));  // Raise src0 to the src1'th power
+  effect(KILL rax, KILL rdx, KILL rcx, KILL cr);
+  format %{ "fast_pow $src0 $src1 -> $dst  // KILL $rax, $rcx, $rdx" %}
+  ins_encode %{
+    __ subptr(rsp, 8);
+    __ movdbl(Address(rsp, 0), $src1$$XMMRegister);
+    __ fld_d(Address(rsp, 0));
+    __ movdbl(Address(rsp, 0), $src0$$XMMRegister);
+    __ fld_d(Address(rsp, 0));
+    __ fast_pow();
+    __ fstp_d(Address(rsp, 0));
+    __ movdbl($dst$$XMMRegister, Address(rsp, 0));
+    __ addptr(rsp, 8);
+  %}
+  ins_pipe( pipe_slow );
+%}
+
+instruct expD_reg(regD dst, regD src, rax_RegI rax, rdx_RegI rdx, rcx_RegI rcx, rFlagsReg cr) %{
+  match(Set dst (ExpD src));
+  effect(KILL rax, KILL rcx, KILL rdx, KILL cr);
+  format %{ "fast_exp $dst -> $src  // KILL $rax, $rcx, $rdx" %}
+  ins_encode %{
+    __ subptr(rsp, 8);
+    __ movdbl(Address(rsp, 0), $src$$XMMRegister);
+    __ fld_d(Address(rsp, 0));
+    __ fast_exp();
+    __ fstp_d(Address(rsp, 0));
+    __ movdbl($dst$$XMMRegister, Address(rsp, 0));
+    __ addptr(rsp, 8);
+  %}
+  ins_pipe( pipe_slow );
+%}
 
 //----------Arithmetic Conversion Instructions---------------------------------