https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91580
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so
/* Generate copies for out-of-chain uses of defs. */
for (df_ref ref = DF_INSN_DEFS (insn); ref; ref = DF_REF_NEXT_LOC (ref))
if (bitmap_bit_p (defs_conv, DF_REF_REGNO (ref)))
{
df_link *use;
for (use = DF_REF_CHAIN (ref); use; use = use->next)
if (DF_REF_REG_MEM_P (use->ref)
|| !bitmap_bit_p (insns, DF_REF_INSN_UID (use->ref)))
break;
if (use)
convert_reg (insn, DF_REF_REG (ref),
*defs_map.get (regno_reg_rtx [DF_REF_REGNO (ref)]));
}
also seems to visit debug uses. Learning more about DF... (and testing patch).
