[Bug tree-optimization/79390] 10% performance drop in SciMark2 LU after r242550

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79390

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
The testcase for RTL if-conversion part:

--cut here--
extern double A[32];

int foo (void)
{
  double t = A[0];
  int jp = 0;
  int i;

  for (i = 0; i < 32; i++)
    {
      double ab = A[i];
      if (ab > t)
        {
          jp = i;
          t = ab;
        }
    }

  return jp;
}
--cut here--

gcc -O2:

        ...
.L5:
        movsd   A(,%rdx,8), %xmm0
        ucomisd %xmm1, %xmm0
        jbe     .L3
        movapd  %xmm0, %xmm1
        movl    %edx, %eax
.L3:
        addq    $1, %rdx
.L2:
        cmpq    $32, %rdx
        jne     .L5

There is no difference w/ and w/o -fno-split-paths with the above testcase.