From: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Date: Tue, 28 Feb 2017 09:55:44 -0500
> @@ -252,19 +248,16 @@ FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
> #ifdef MEMCPY_DEBUG
> wr %g0, 0x80, %asi
> #endif
> - srlx %o2, 31, %g2
> - cmp %g2, 0
> - tne %XCC, 5
> PREAMBLE
> mov %o0, %o3
> brz,pn %o2, .Lexit
This limitation was placed here intentionally, because huge values
are %99 of the time bugs and unintentional.
You will see that every assembler optimized memcpy on sparc64 has
this bug trap, not just NG4.
This is a very useful way to find bugs and length {over,under}flows.
Please do not remove it.
If you have to do 4GB or larger copies, do it in pieces or similar.
Thank you.
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