Re: [PATCH] alpha: don't delete a caller's gp reload after a call

Alan Modra <[email protected]>
Newsgroups gmane.comp.gnu.binutils
Message-ID <[email protected]> 
On Fri, Aug 14, 2026 at 03:27:12PM -0400, Matt Turner wrote:
> Recovering the optimization needs proof that the callee returns with gp
> intact.  A callee containing no tail call, direct or indirect, always
> does, but establishing that requires scanning the target function here.

A scan can be avoided if the target function advertises that
information somehow, for example, via callee st_other bits.  Just
saying, I don't expect you to implement any such scheme.

> 	* elf64-alpha.c (elf64_alpha_relax_with_lituse): Don't turn the
> 	GPDISP ldah/lda pair into unops when the callee shares our gp.
> 
> ld/
> 	* testsuite/ld-alpha/relax-gpdisp.s: New test.
> 	* testsuite/ld-alpha/relax-gpdisp.d: New test.

OK.

-- 
Alan Modra
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