On Tue, Nov 12, 2013 at 02:57:49PM +0100, Paolo Bonzini wrote:
> Il 12/11/2013 14:23, Gleb Natapov ha scritto:
> >> If -O0 does not do that, let's move debug builds to -O1.
> >
> > Why not enable dce with -fdce?
>
> First, because clang doesn't have fine-tuned optimization options (at
> least I couldn't find them and -fdce doesn't work).
>
-O1 then for clang.
> Second, because most optimization options are no-ops at -O0 (try "-fdce
> -fdump-tree-all" with GCC.
>
Strange. Is this by design? We can do -O1 and bunch of "-fno-" to
disable most of optimizations -O1 enables, but this is ugly.
--
Gleb.
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