Re: PATCH: PR rtl-optimization/50696: [x32] Unnecessary lea

[Paolo Bonzini]

On 10/13/2011 02:51 PM, Richard Kenner wrote:

     case MEM:
       /* Ensure that our address has any ASHIFTs converted to MULT in case
          address-recognizing predicates are called later.  */
       temp = make_compound_operation (XEXP (x, 0), MEM);
       SUBST (XEXP (x, 0), temp);
       break;

THAT'S the code that should do the transformation that this patch contains.
So I'd suggest doing some debugging and seeing why it isn't.  This could
just be a bug in make_compound_operation not handling the SUBREG.

Or being fooled by the 0xfffffffc masking, perhaps.

Paolo