[Bug target/63404] [5 Regression] gcc 5 miscompiles linux block layer

[jiwang at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63404

--- Comment #8 from Jiong Wang <jiwang at gcc dot gnu.org> ---
(In reply to Pat Haugen from comment #6)
> (In reply to Jiong Wang from comment #5)
> > we need to check the following 
> > 
> >    else if (GET_CODE == CLOBBER
> >             || GET_CODE (x) == USE
> >             || GET_CODE (x) == ASM_INPUT)
> > 
> > I will post the fix after pass x86 bootstrap and regression
> 
> r215563 also introduced a miscompare on PowerPC for cpu2000 benchmark
> 254.gap. Applying your patch proposed on the gcc-patches ml for this bug
> fixes the issue.

and I am curious about whether there are any performance change since this insn
sink change.