[Bug tree-optimization/68695] [6 Regression] Performance regression related to ssa patch / ifcvt

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68695

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
On x86_64 the testcase produces

foo:
.LFB0:
        .cfi_startproc
        cmpl    %esi, %edi
        movl    %edx, %ecx
        movl    %edx, %eax
        cmovle  %esi, %ecx
        cmovle  %edi, %eax
        imull   %ecx, %eax
        ret

we expand from 

  # i_1 = PHI <x_3(D)(2), a_5(D)(3)>
  # j_2 = PHI <y_4(D)(2), a_5(D)(3)>
  _6 = i_1 * j_2;
  return _6;

and on x86_64 we coalesce i_1 with x_3 and j_2 with y_4 which would
match your "before change" generated code (copy a_5 to both other regs).

So RTL ifcvt dumps are required here, too.