RFR (M): 8150767: Update for x86 SHA Extensions enabling

Deshpande, Vivek R vivek.r.deshpande at intel.com
Mon Feb 29 21:29:58 UTC 2016

HI Vladimir

Thank you for your review.
I have updated the patch with the changes you have suggested.
The new webrev is at this location:


-----Original Message-----
From: Vladimir Kozlov [mailto:vladimir.kozlov at oracle.com] 
Sent: Friday, February 26, 2016 6:50 PM
To: Deshpande, Vivek R; hotspot compiler
Cc: Viswanathan, Sandhya; Rukmannagari, Shravya
Subject: Re: RFR (M): 8150767: Update for x86 SHA Extensions enabling

Very nice, Vivek!!!

Did you run tests with both 32- and 64-bit VMs?

Small notes:

In vm_version_x86.hpp spacing are not aligned in next line:

    static bool supports_avxonly()    { return ((supports_avx2() || 
supports_avx()) && !supports_evex()); }
+  static bool supports_sha()      { return (_features & CPU_SHA) != 0; }

Flags setting code in vm_version_x86.cpp should be like this (you can check supports_sha() only once, don't split '} else {' line, set UseSHA false if all intrinsics flags are false (I included UseSHA512Intrinsics for future) ):

   if (supports_sha()) {
     if (FLAG_IS_DEFAULT(UseSHA)) {
       UseSHA = true;
   } else if (UseSHA) {
     warning("SHA instructions are not available on this CPU");
     FLAG_SET_DEFAULT(UseSHA, false);

   if (UseSHA) {
     if (FLAG_IS_DEFAULT(UseSHA1Intrinsics)) {
       FLAG_SET_DEFAULT(UseSHA1Intrinsics, true);
   } else if (UseSHA1Intrinsics) {
     warning("Intrinsics for SHA-1 crypto hash functions not available on this CPU.");
     FLAG_SET_DEFAULT(UseSHA1Intrinsics, false);

   if (UseSHA) {
     if (FLAG_IS_DEFAULT(UseSHA256Intrinsics)) {
       FLAG_SET_DEFAULT(UseSHA256Intrinsics, true);
   } else if (UseSHA256Intrinsics) {
     warning("Intrinsics for SHA-224 and SHA-256 crypto hash functions not available on this CPU.");
     FLAG_SET_DEFAULT(UseSHA256Intrinsics, false);

   if (UseSHA512Intrinsics) {
     warning("Intrinsics for SHA-384 and SHA-512 crypto hash functions not available on this CPU.");
     FLAG_SET_DEFAULT(UseSHA512Intrinsics, false);

   if (!(UseSHA1Intrinsics || UseSHA256Intrinsics || UseSHA512Intrinsics)) {
     FLAG_SET_DEFAULT(UseSHA, false);


On 2/26/16 4:37 PM, Deshpande, Vivek R wrote:
> Hi all
> I would like to contribute a patch which optimizesSHA-1 andSHA-256 for
> 64 and 32 bitX86architecture using Intel SHA extensions.
> Could you please review and sponsor this patch.
> Bug-id:
> https://bugs.openjdk.java.net/browse/JDK-8150767
> webrev:
> http://cr.openjdk.java.net/~vdeshpande/SHANI/8150767/webrev.00/
> Thanks and regards,
> Vivek

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