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Subject: [Bug target/50603] [x32] Unnecessary lea
Date: Thu, 06 Oct 2011 19:01:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50603

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2011-10-06 19:00:54 UTC ---
[hjl@gnu-mic-2 pr50633]$ cat x.i
struct s { int val[16]; };

extern double f (struct s pb, double pc);

int main ()
{
  struct s x;
  int i;

  for (i = 0; i < 16; i++)
    x.val[i] = i + 1;
  if (f (x, 10000.0L) != 10136.0L)
    __builtin_abort ();
  return 0;
}
[hjl@gnu-mic-2 pr50633]$ make x.s
/export/build/gnu/gcc-x32/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc-x32/build-x86_64-linux/gcc/ -mx32 -O -S x.i
[hjl@gnu-mic-2 pr50633]$ cat x.s
    .file    "x.i"
    .text
    .globl    main
    .type    main, @function
main:
.LFB0:
    .cfi_startproc
    subq    $136, %rsp
    .cfi_def_cfa_offset 144
    movl    $0, %eax
    movl    %esp, %ecx
    addl    $60, %ecx
.L2:
    addl    $1, %eax
    leal    (%rcx,%rax,4), %edx
    movl    %eax, (%edx)
    cmpl    $16, %eax
    jne    .L2
    movq    64(%rsp), %rax
    movq    %rax, (%rsp)
    movq    72(%rsp), %rax
    movq    %rax, 8(%rsp)
    movq    80(%rsp), %rax
    movq    %rax, 16(%rsp)
    movq    88(%rsp), %rax
    movq    %rax, 24(%rsp)
    movq    96(%rsp), %rax
    movq    %rax, 32(%rsp)
    movq    104(%rsp), %rax
    movq    %rax, 40(%rsp)
    movq    112(%rsp), %rax
    movq    %rax, 48(%rsp)
    movq    120(%rsp), %rax
    movq    %rax, 56(%rsp)
    movsd    .LC0(%rip), %xmm0
    call    f
    ucomisd    .LC1(%rip), %xmm0
    jp    .L5
    je    .L7
.L5:
    call    abort
.L7:
    movl    $0, %eax
    addq    $136, %rsp
    .cfi_def_cfa_offset 8
    ret
    .cfi_endproc
.LFE0:
    .size    main, .-main

    leal    (%rcx,%rax,4), %edx
    movl    %eax, (%edx)

can be combined into

       movl    %eax, (%ecx,%eax,4)