http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58981
--- Comment #3 from Jan Hubicka <hubicka at ucw dot cz> --- > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58981 > > --- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> --- > The bug is in > > *count = expand_simple_binop (GET_MODE (*count), PLUS, *count, > saveddest, *count, 1, OPTAB_DIRECT); > > (gdb) call debug_rtx (saveddest) > (reg:SI 101) > (gdb) call debug_rtx (*count) > (reg:DI 100) > (gdb) > > Add SImode address to DImode count to update count leads > to count overflow. Instead, we should use mode of address > here: > > diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c > index 902e169..b27bfb6 100644 > --- a/gcc/config/i386/i386.c > +++ b/gcc/config/i386/i386.c > @@ -23139,7 +23139,7 @@ > expand_set_or_movmem_prologue_epilogue_by_misaligned_moves (rtx destmem, rtx > src > if (!issetmem) > *srcptr = expand_simple_binop (GET_MODE (*srcptr), MINUS, *srcptr, > saveddest, > *srcptr, 1, OPTAB_DIRECT); > - *count = expand_simple_binop (GET_MODE (*count), PLUS, *count, > + *count = expand_simple_binop (GET_MODE (saveddest), PLUS, *count, This looks OK, Thanks for looking into it! Honza > saveddest, *count, 1, OPTAB_DIRECT); > /* We copied at most size + prolog_size. */ > if (*min_size > (unsigned HOST_WIDE_INT)(size + prolog_size)) > > -- > You are receiving this mail because: > You are on the CC list for the bug.
