Comparison of GCC-4.9 and LLVM-3.4 performance on SPECInt2000 for x86-64 and ARM

[Marc Glisse]

On Wed, 25 Jun 2014, Vladimir Makarov wrote:

> Maybe.  But in this case LLVM did a right thing.  The variable addressing was 
> through a restrict pointer.

Ah, gcc implements (on purpose?) a weak version of restrict, where it only 
considers that 2 restrict pointers don't alias, whereas all other 
compilers assume that restrict pointers don't alias other non-derived 
pointers (see several PRs in bugzilla). I believe Richard recently added 
code that would make implementing the strong version of restrict easier. 
Maybe that's what is missing here?

-- 
Marc Glisse