Re: Add a few RTL predicates

[Steven Bosscher <stevenb at suse dot de>]

On Friday 11 June 2004 01:14, Richard Henderson wrote:
> On Fri, Jun 11, 2004 at 12:08:33AM +0200, Steven Bosscher wrote:
> > The redefinition of INSN_P is a marginal speed-up.
>
> Measurably?  It doesn't look like a speed up...

Nothing convincing on machines I've tried it on, but the assembly
looks slightly better (left is without, right is with patch):

  movzwq  (%rdi), %rax               |         movzwl  (%rdi), %eax
  cmpl    $7, rtx_class(,%rax,4)     |         subl    $43, %eax
  sete    %al                        |         cmpw    $2, %ax
                                     >         setbe   %al
  movzbl  %al, %eax                            movzbl  %al, %eax

Gr.
Steven