@@ -1101,6 +1101,7 @@ forward_propagate_subreg (df_ref use, rtx def_insn, rtx def_set)
src = SET_SRC (def_set);
if (GET_CODE (src) == SUBREG
&& REG_P (SUBREG_REG (src))
+ && REGNO (SUBREG_REG (src)) >= FIRST_PSEUDO_REGISTER
&& GET_MODE (SUBREG_REG (src)) == use_mode
&& subreg_lowpart_p (src)
&& all_uses_available_at (def_insn, use_insn))
@@ -1119,6 +1120,7 @@ forward_propagate_subreg (df_ref use, rtx def_insn, rtx def_set)
if ((GET_CODE (src) == ZERO_EXTEND
|| GET_CODE (src) == SIGN_EXTEND)
&& REG_P (XEXP (src, 0))
+ && REGNO (XEXP (src, 0)) >= FIRST_PSEUDO_REGISTER
&& GET_MODE (XEXP (src, 0)) == use_mode
&& !free_load_extend (src, def_insn)
&& all_uses_available_at (def_insn, use_insn))