[8u] request for approval: "8152172: PPC64: Support AES intrinsics"

[Volker Simonis]

Hi,

could you please approve the backport of the following, mostly ppc64
change to jdk8u-dev:

8152172: PPC64: Support AES intrinsics

Bug: https://bugs.openjdk.java.net/browse/JDK-8152172
Webrev: http://cr.openjdk.java.net/~simonis/webrevs/2016/8152172_8u_hs/
Webrev http://cr.openjdk.java.net/~simonis/webrevs/2016/8152172_8u_jdk/
Review: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-March/thread.html#22032
URL:http://hg.openjdk.java.net/jdk9/hs-comp/jdk/rev/74bc7be0777b
URL:http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/68394bf0a09f

As you can see, the change consists of two parts - the main one in the
hotpsot repo and a small part in the jdk repo.

The jdk part applied cleanly to jdk8u (with the usual directory shuffling).

The hotspot part required a small tweak, but only in the ppc-only
part. This is because the feature detection for the AES instructions
was already active in jdk9 when the original change was made but is
not available in jdk8u until now. You can find the additional changes
at the end of this mail for your convenience.

The required shared changes cleanly apply to jdk8u.

As Vladimir pointed out in a previous thread, shared Hotspot changes
have to go through JPRT even in jdk8u-dev. So I need a sponsor to do
that and synchronously push both parts.

@Hiroshii: could you please verify that you are fine with the change?
I've done some tests on Power8LE but just want to be sure this
downport satisfies your needs as well.

Thank you and best regards,
Volker

=====================

diff -r 15928d255046 src/cpu/ppc/vm/vm_version_ppc.cpp
--- a/src/cpu/ppc/vm/vm_version_ppc.cpp Wed Jul 13 00:47:40 2016 -0700
+++ b/src/cpu/ppc/vm/vm_version_ppc.cpp Fri Jul 22 10:32:36 2016 +0200
@@ -452,6 +476,7 @@
   a->popcntw(R7, R5);                          // code[7] -> popcntw
   a->fcfids(F3, F4);                           // code[8] -> fcfids
   a->vand(VR0, VR0, VR0);                      // code[9] -> vand
+  a->vcipher(VR0, VR1, VR2);                   // code[10] -> vcipher
   a->blr();

   // Emit function to set one cache line to zero. Emit function
descriptor and get pointer to it.
@@ -495,6 +520,7 @@
   if (code[feature_cntr++]) features |= popcntw_m;
   if (code[feature_cntr++]) features |= fcfids_m;
   if (code[feature_cntr++]) features |= vand_m;
+  if (code[feature_cntr++]) features |= vcipher_m;

   // Print the detection code.
   if (PrintAssembly) {
diff -r 15928d255046 src/cpu/ppc/vm/vm_version_ppc.hpp
--- a/src/cpu/ppc/vm/vm_version_ppc.hpp Wed Jul 13 00:47:40 2016 -0700
+++ b/src/cpu/ppc/vm/vm_version_ppc.hpp Fri Jul 22 10:32:36 2016 +0200
@@ -42,6 +42,7 @@
     fcfids,
     vand,
     dcba,
+    vcipher,
     num_features // last entry to count features
   };
   enum Feature_Flag_Set {
@@ -56,6 +57,7 @@
     fcfids_m              = (1 << fcfids ),
     vand_m                = (1 << vand   ),
     dcba_m                = (1 << dcba   ),
+    vcipher_m             = (1 << vcipher),
     all_features_m        = -1
   };
   static int  _features;
@@ -83,6 +85,7 @@
   static bool has_fcfids()  { return (_features & fcfids_m) != 0; }
   static bool has_vand()    { return (_features & vand_m) != 0; }
   static bool has_dcba()    { return (_features & dcba_m) != 0; }
+  static bool has_vcipher() { return (_features & vcipher_m) != 0; }

   static const char* cpu_features() { return _features_str; }