[Bug rtl-optimization/65135] [5 Regression] Performance regression in pic mode after r220674.

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65135

--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
This patch improves performance of almost all benchmarks in pic-mode for 32-bit
target, but we have the only huge degradation on benchmark from eembc1.1 suite.

I mentioned that the innermost loop has one more fill.

before r220674
.L8:
    testl    %esi, %esi
    jne    .L11
    movl    16(%esp), %eax
    movl    (%eax,%edx), %eax
    cmpl    $-1, %eax
    je    .L13
.L43:
    movl    4(%esp), %edi
    leal    0(,%eax,4), %edx
    movl    %ecx, %ebx
    addl    %edx, %edi
    cmpl    $101, %ecx
    je    .L41
    leal    1(%ebx), %ecx
    movl    8(%esp), %ebp
    cmpl    (%edi), %ebp
    jne    .L8

after r220674
.L6:
    movl    4(%esp), %ebx   <--  redundant fill
    testl    %ebx, %ebx
    jne    .L9
    movl    20(%esp), %eax
    movl    (%eax,%edx), %eax
    cmpl    $-1, %eax
    je    .L11
.L42:
    movl    8(%esp), %edi
    leal    0(,%eax,4), %edx
    movl    %ecx, %ebx
    addl    %edx, %edi
    cmpl    $101, %ecx
    je    .L40
    leal    1(%ebx), %ecx
    movl    12(%esp), %esi
    cmpl    (%edi), %esi
    jne    .L6

The issue is that before the fix GOT-register is not considered for allocation
it to physical register.