Per clarification in [1], macro is supposed to check for partial clobbering of single HW registers. Since PRU declares only 8-bit HW registers, and ABI does not define individual bit clobbering, it is safe to remove the implementation.
[1] https://gcc.gnu.org/ml/gcc-patches/2019-09/msg00778.html gcc/ChangeLog: 2019-10-13 Dimitar Dimitrov <dimi...@dinux.eu> * config/pru/pru.c (pru_hard_regno_call_part_clobbered): Remove. (TARGET_HARD_REGNO_CALL_PART_CLOBBERED): Remove. Signed-off-by: Dimitar Dimitrov <dimi...@dinux.eu> --- gcc/config/pru/pru.c | 34 ---------------------------------- 1 file changed, 34 deletions(-) diff --git a/gcc/config/pru/pru.c b/gcc/config/pru/pru.c index dabea2b59c8..d66b989eb2d 100644 --- a/gcc/config/pru/pru.c +++ b/gcc/config/pru/pru.c @@ -556,37 +556,6 @@ pru_hard_regno_scratch_ok (unsigned int regno) } -/* Implement TARGET_HARD_REGNO_CALL_PART_CLOBBERED. */ - -static bool -pru_hard_regno_call_part_clobbered (unsigned, unsigned regno, - machine_mode mode) -{ - HARD_REG_SET caller_saved_set; - HARD_REG_SET callee_saved_set; - - CLEAR_HARD_REG_SET (caller_saved_set); - CLEAR_HARD_REG_SET (callee_saved_set); - - /* r0 and r1 are caller saved. */ - add_range_to_hard_reg_set (&caller_saved_set, 0, 2 * 4); - - add_range_to_hard_reg_set (&caller_saved_set, FIRST_ARG_REGNUM, - LAST_ARG_REGNUM + 1 - FIRST_ARG_REGNUM); - - /* Treat SP as callee saved. */ - add_range_to_hard_reg_set (&callee_saved_set, STACK_POINTER_REGNUM, 4); - - /* r3 to r13 are callee saved. */ - add_range_to_hard_reg_set (&callee_saved_set, FIRST_CALLEE_SAVED_REGNUM, - LAST_CALEE_SAVED_REGNUM + 1 - - FIRST_CALLEE_SAVED_REGNUM); - - return overlaps_hard_reg_set_p (caller_saved_set, mode, regno) - && overlaps_hard_reg_set_p (callee_saved_set, mode, regno); -} - - /* Worker function for `HARD_REGNO_RENAME_OK'. Return nonzero if register OLD_REG can be renamed to register NEW_REG. */ @@ -2935,9 +2904,6 @@ pru_unwind_word_mode (void) #undef TARGET_HARD_REGNO_SCRATCH_OK #define TARGET_HARD_REGNO_SCRATCH_OK pru_hard_regno_scratch_ok -#undef TARGET_HARD_REGNO_CALL_PART_CLOBBERED -#define TARGET_HARD_REGNO_CALL_PART_CLOBBERED \ - pru_hard_regno_call_part_clobbered #undef TARGET_FUNCTION_ARG #define TARGET_FUNCTION_ARG pru_function_arg -- 2.20.1