[Bug tree-optimization/14541] [tree-ssa] built-in math functions are not fully optimized at tree level

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14541

--- Comment #23 from ktkachov at gcc dot gnu.org ---
(In reply to Richard Biener from comment #22)
> (In reply to ktkachov from comment #21)
> > Created attachment 34215 [details]
> > Link errors output for aarch64
> > 
> > > Which one exactly?  That is, what is the failing link output?
> > 
> > All of them AFAICS. I'm attaching the link failures log.
> > 
> > The test PASSes at -O2 -flto and -O2 -flto -flto-partition=none
> > 
> > but FAILs on all other torture options
> 
> With a cross to aarch64-linux and compiling with -O1+ -ffast-math the
> result is as expected (optimized to empty functions).  How exactly
> do you configure?  I used
> 
> /space/rguenther/src/svn/trunk2/configure --target=aarch64-suse-linux
> --enable-languages=c,c++,fortran --enable-checking

Hmmm... My compiler is a bare-metal one: aarch64-none-elf (and I still see
these failures).

With an aarch64-none-linux-gnu compiler the testcase works fine...