Request for review (XS): 7027232: JSR 292: wrong numeric value returned by MH on solaris-sparc

Vladimir Kozlov vladimir.kozlov at
Thu Mar 17 09:56:34 PDT 2011

Sorry for arguing about few lines but I think without renaming the code will be better (6 new lines instead of 7):

+ #ifdef _LP64
+           __ ldsw(arg_lsw, O2_scratch);                  // Load LSW
+ #else
+           __ ldsw(arg_lsw, O3_scratch);                  // Load LSW
+           __ srlx(O3_scratch, BitsPerInt, O2_scratch));  // Move MSW value to lower 32-bits for STD
+ #endif
             __ st_long(O2_scratch, arg_msw);               // Uses O2/O3 on !_LP64


On 3/17/11 2:24 AM, Christian Thalinger wrote:
> On Mar 15, 2011, at 6:22 PM, Vladimir Kozlov wrote:
>> Christian,
>> We don't support little-endian SPARC, why add a code which will never be executed?
> I thought to be on the safe side if anyone ever wants to support it.  Anyway, I removed it and updated the webrev.
> -- Christian
>> On side note (RFE): we should officially drop v8 support (C2 does not support already, only C1). There are already several places where we use stx/ldx without check that it is v9 (yes, we still have an assert which is fine). Also std/ldd is emulated on modern SPARC and so is very slow.
>> Thanks,
>> Vladimir
>> Christian Thalinger wrote:
>>> 7027232: JSR 292: wrong numeric value returned by MH on solaris-sparc
>>> Reviewed-by:
>>> After 7018378 one of the tests of java/dyn/MethodHandlesTest fails on
>>> 32-bit SPARC.  st_long uses STD on 32-bit SPARC and the LSW and MSW
>>> bits are not moved to the proper registers resulting in a wrong
>>> result.
>>> The fix is to use the correct registers for 32-bit big-endian and
>>> little-endian (just in case) SPARC.
>>> src/cpu/sparc/vm/methodHandles_sparc.cpp

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