Re: Remove bad comment in scan_paradoxical_subregs in reload1.c

[Jim Wilson <wilson at specifixinc dot com>]

Ian Lance Taylor wrote:
> I'm pretty sure that this documented restriction no longer exists.
> I'm pretty sure that the current compiler will use such a register for
> reload when it can.  But I don't know how to prove it, so I'm not
> going to propose modifying the documentation.

I don't think it is hard to prove this.  I wrote an x86 testcase that 
uses 6 register variables, compiled it with -O2, and 2 of them got used 
for spill registers in reload.  I think that clearly proves that the 
restriction no longer exists.

> 	* reload1.c (reload): Correct comment.
> 	(scan_paradoxical_subregs): Remove #if 0 and old comment.

OK.

Please also delete the one sentence in extend.texi that claims these 
registers are not used by reload.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com
int array[10][10][10];

int ga, gb, gc, gd, ges, ged;

void
sub (void)
{
  register int a __asm__ ("%eax");
  register int b __asm__ ("%ebx");
  register int c __asm__ ("%ecx");
  register int d __asm__ ("%edx");
  register int es __asm__ ("%esi");
  register int ed __asm__ ("%edi");

  a = ga;
  b = gb;
  c = gc;
  d = gd;
  es = ges;
  ed = ged;

  array[a][b][c] = array[d][es][ed];
}