dist/gcc/cfgcleanup.c

989 values_equal_p (rtx note1, rtx note2, rtx src1, rtx src2)
991   if (note1
993       && CONST_INT_P (XEXP (note1, 0))
994       && rtx_equal_p (XEXP (note1, 0), XEXP (note2, 0)))
997   if (!note1
1004   if (note1
1006       && rtx_equal_p (XEXP (note1, 0), src2))
1025   rtx s1, s2, d1, d2, src1, src2, note1, note2;
1043   note1 = find_reg_equal_equiv_note (i1);
1049   if (!values_equal_p (note1, note2, src1, src2))