Quoting daniel tian <daniel.xnt...@gmail.com>:
hi, everyone: I have ported the gcc to new RISC chip. But when I build the newlib with it, the gcc crashed in simplify-rtx.c. error message is like this:../../../../../newlib-1.16.0/newlib/libc/time/tzset_r.c: In function _tzset_r? ../../../../../newlib-1.16.0/newlib/libc/time/tzset_r.c:195: internal compiler error: in simplify_const_unary_operation, at simplify-rtx.c:1108 And the code there is simplify-rtx.c 1108: case ZERO_EXTEND: /* When zero-extending a CONST_INT, we need to know its original mode. */ gcc_assert (op_mode != VOIDmode); I tracked the gcc, It caused by the RTX (const_int 60). As I know the CONST_INT is alway being VOIDmode.
That exactly is the problem. You can't have a CONST_INT inside a ZERO_EXTEND. That is not valid. You'll need a separate pattern to recognize the CONST_INT without a ZERO_EXTEND around it. Unfortunately, this will not give reload the freedom it should have.
