[PATCH v1 4/4] LoongArch: Add testsuits for TLSDESC in gas and ld.

[Xi Ruoyao]

On Sat, 2023-12-02 at 15:38 +0800, Xi Ruoyao wrote:
> On Fri, 2023-12-01 at 17:04 +0800, Lulu Cai wrote:
> > +	pcalau12i       $a0,%desc_pc_hi20(var)
> > +	ld.d    $a1,$a0,%desc_ld_pc_lo12(var)
> > +	addi.d  $a0,$a0,%desc_add_pc_lo12(var)
> > +	jirl    $ra,$a1,%desc_call(var)
> 
> Should we consider using a different link register for desc_call?  Say
> 
> jirl $t0,$a1,%desc_call(var)
> 
> And when the TLS descriptor function returns, use "jr $t0" instead of
> "ret".  The advantage would be avoiding saving $ra just because TLS
> descriptor is used.

Hmm, maybe better:

jirl $a1, $a1, %desc_call(var)

Just reuse a1 as it's clobbered anyway.  Then __tlsdesc_static becomes
something like

__tlsdesc_static:
    ld.d    $a0, $a0, 0
    jr      $a1

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University