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Re: Redundant instructions in loop optimization for x86-64?
On Fri, Sep 10, 2004 at 01:43:09PM -0700, James E Wilson wrote:
> H. J. Lu wrote:
> >Is there a way to tell gcc that 32bit zero extension isn't needed for
> It isn't quite that simple. Sometimes they will be needed. Sometimes
> they won't.
> You might want to look at
> which is a proposal to add an RTL optimization pass to eliminate
> unnecessary sign/zero extension instructions on targets that support
> both 32-bit and 64-bit code.
Is there a version which will apply to the current source tree?