https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100085
--- Comment #9 from luoxhu at gcc dot gnu.org --- Patch sent, it could fix the __float128 to vector __int128 issue, https://gcc.gnu.org/pipermail/gcc-patches/2021-June/571689.html But for __float128 to __int128 mentioned in #c4, need hack rs6000_modes_tieable_p to remove the stack operation in dse1. But I am not sure this is *LEGAL* since TImode is allocated to GPR, It seems not true to access TImode from ALTIVEC or VSX without copying? diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index ad11b67b125..ee69463ac46 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1974,6 +1974,9 @@ rs6000_modes_tieable_p (machine_mode mode1, machine_mode mode2) || mode2 == PTImode || mode2 == OOmode || mode2 == XOmode) return mode1 == mode2; + if (mode1 == TImode && ALTIVEC_OR_VSX_VECTOR_MODE (mode2)) + return true; + xxpermdi %vs0,%vs34,%vs34,3 mfvsrd %r4,%vs34 mfvsrd %r3,%vs0
