[Bug rtl-optimization/102178] [12 Regression] SPECFP 2006 470.lbm regressions on AMD Zen CPUs after r12-897-gde56f95afaaa22

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102178

--- Comment #9 from Hongtao.liu <crazylht at gmail dot com> ---
    1703 :   401cb1: vmovq  %xmm1,%r9   (*)
     834 :   401cb6: vmovq  %r8,%xmm1
    1719 :   401cbb: vmovq  %r9,%xmm0   (*)

Look like %r9 is dead after the second (*), and it can be optimized to

    1703 :   401cb1: vmovq  %xmm1,%xmm0
     834 :   401cb6: vmovq  %r8,%xmm1