[Bug target/49781] [x32] Unnecessary lea in x32 mode

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49781

--- Comment #12 from Uros Bizjak <ubizjak at gmail dot com> 2011-08-03 16:08:47 UTC ---
(In reply to comment #11)

> gcc.dg/torture/pr47744-2.c compiled with
> 
> -mx32 -O3 -std=gnu99 -ftree-vectorize -funroll-loops
> 
> generates codes  like
> 
>     leal    (%rax,%r9), %r12d
>     leal    (%rax,%rdi), %r10d
>     mov    %r12d, %edx
>     movq    (%r12d), %rbp
>     movq    8(%rdx), %rdx
>     movq    (%r12d), %rax
> 
> Many leal aren't necessary.

This is the tradeof for using offsetable address for DWI operands.