RFR: 8325821: [REDO] use "dmb.ishst+dmb.ishld" for release barrier [v7]

[Andrew Haley]

On Tue, 16 Apr 2024 02:00:43 GMT, kuaiwei <duke at openjdk.org> wrote:

> > Hi, I guess this isn't quite ready for review let. I'll have another look whan it is.
> 
> Is there any other gap I'm not aware?

Well, you're asking me to speculate on what you're aware of, but the very first thing I see when I run "java -version" with this patch is this, so I assume you're not finished.


  0x0000ffffe8ad2750:   str		w11, [x0, #0x14]    ;*invokespecial <init> {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - java.lang.StringLatin1::replace at 123 (line 427)
 ;; membar_release
  0x0000ffffe8ad2754:   dmb		ishld
  0x0000ffffe8ad2758:   dmb		ishst               ;*new {reexecute=0 rethrow=0 return_oop=0}
                                                            ; - java.lang.StringLatin1::replace at 116 (line 427)
 ;; membar_release
  0x0000ffffe8ad275c:   dmb		ishld
  0x0000ffffe8ad2760:   dmb		ishst               ;*synchronization entry
                                                            ; - java.lang.StringLatin1::replace at -1 (line 408)

-------------

PR Comment: https://git.openjdk.org/jdk/pull/18467#issuecomment-2058612717