[Bug tree-optimization/32698] [4.3 regression] inefficient pointer expression

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2007-07-09 13:41 -------
Created an attachment (id=13875)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13875&action=view)
patch

With the proposed patch mainline generates again

foo:
        pushl   %ebp
        movl    %esp, %ebp
        movl    8(%ebp), %ecx
        movl    12(%ebp), %edx
        popl    %ebp
        movl    8(%ecx,%edx,4), %eax
        addl    4(%ecx,%edx,4), %eax
        addl    12(%ecx,%edx,4), %eax
        ret

and

  return (*(p + (i + 2) * 4) + *(p + (i + 1) * 4)) + *(p + (i + 3) * 4);


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32698