https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77718
--- Comment #5 from Aaron Sawdey <acsawdey at linux dot vnet.ibm.com> --- On Tue, 2016-09-27 at 14:30 +0000, bernds at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77718 > > --- Comment #4 from Bernd Schmidt <bernds at gcc dot gnu.org> --- > So something like this maybe? > > Index: builtins.c > =================================================================== > --- builtins.c (revision 240511) > +++ builtins.c (working copy) > @@ -3707,11 +3707,13 @@ expand_builtin_memcmp (tree exp, rtx tar > > by_pieces_constfn constfn = NULL; > > - const char *src_str = c_getstr (arg1); > - if (src_str == NULL) > - src_str = c_getstr (arg2); > - else > - std::swap (arg1_rtx, arg2_rtx); > + const char *src_str = c_getstr (arg2); > + if (result_eq && src_str == NULL) > + { > + src_str = c_getstr (arg1); > + if (src_str != NULL) > + std::swap (arg1_rtx, arg2_rtx); > + } > > /* If SRC is a string constant and block move would be done > by pieces, we can avoid loading the string from memory Bernd, Yeah that is about what I was thinking it needed. I'll test this on ppc64le. Thanks, Aaron
