re PR target/69305 (wrong code with -O and int128 @ aarch64)

re PR target/69305 (wrong code with -O and int128 @ aarch64)

PR target/69305

  * config/aarch64/aarch64-modes.def (CC_Cmode): New
  * config/aarch64/aarch64-protos.h: Update.
  * config/aarch64/aarch64.c (aarch64_zero_extend_const_eq): New.
  (aarch64_select_cc_mode): Add check for use of CC_Cmode.
  (aarch64_get_condition_code_1): Handle CC_Cmode.
  * config/aarch64/aarch64.md (addti3): Use adddi3_compareC.
  (*add<mode>3_compareC_cconly_imm): New.
  (*add<mode>3_compareC_cconly): New.
  (*add<mode>3_compareC_imm): New.
  (add<mode>3_compareC): New.
  (add<mode>3_carryin, *addsi3_carryin_uxtw): Sort compare operand
  to be first.  Use aarch64_carry_operation.
  (*add<mode>3_carryin_alt1, *addsi3_carryin_alt1_uxtw): Remove.
  (*add<mode>3_carryin_alt2, *addsi3_carryin_alt2_uxtw): Remove.
  (*add<mode>3_carryin_alt3, *addsi3_carryin_alt3_uxtw): Remove.
  (subti3): Use subdi3_compare1.
  (*sub<mode>3_compare0): Rename from sub<mode>3_compare0.
  (sub<mode>3_compare1): New.
  (*sub<mode>3_carryin0, *subsi3_carryin_uxtw): New.
  (*sub<mode>3_carryin): Use aarch64_borrow_operation.
  (*subsi3_carryin_uxtw): Likewise.
  (*ngc<mode>, *ngcsi_uxtw): Likewise.
  (*sub<mode>3_carryin_alt, *subsi3_carryin_alt_uxtw): New.
  * config/aarch64/iterators.md (DWI): New.
  * config/aarch64/predicates.md (aarch64_carry_operation): New.
  (aarch64_borrow_operation): New.

From-SVN: r232936