[dtrace-discuss] nop instruction generated by sun cc

[Joerg Schilling]

"???? TaoJie" <eulertao at gmail.com> wrote:

> there's no sun studio mailling list in opensolaris.org, i raise my problem
> here :)
>
> a simple piece of code, 2 nested while loops, and some if statements inside
> each while loop.
>
> i compiled this program in Solaris with sun cc (sun studio 12)  and gcc.
> and i compiled it in Debian with gcc as well.
>
> Then I dumped (disassembled) these 3 programs.
> I found that there were alway serveral nop instructions followed with the
> jmp instruction in the program generated by suncc.
> and this problem didn't exist in the other 2 program generated by gcc.

This is how unoptimized sparc code looks since at least 21 years.

Jörg

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