diff options
Diffstat (limited to 'gcc/config/mn10300/mn10300.c')
| -rw-r--r-- | gcc/config/mn10300/mn10300.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/gcc/config/mn10300/mn10300.c b/gcc/config/mn10300/mn10300.c index 47fd5cbf933..e32f3766d64 100644 --- a/gcc/config/mn10300/mn10300.c +++ b/gcc/config/mn10300/mn10300.c @@ -69,6 +69,7 @@ enum processor_type mn10300_processor = PROCESSOR_DEFAULT; static bool mn10300_handle_option (size_t, const char *, int); +static bool mn10300_legitimate_address_p (enum machine_mode, rtx, bool); static int mn10300_address_cost_1 (rtx, int *); static int mn10300_address_cost (rtx, bool); static bool mn10300_rtx_costs (rtx, int, int, int *, bool); @@ -127,6 +128,9 @@ static unsigned int mn10300_case_values_threshold (void); #undef TARGET_CASE_VALUES_THRESHOLD #define TARGET_CASE_VALUES_THRESHOLD mn10300_case_values_threshold +#undef TARGET_LEGITIMATE_ADDRESS_P +#define TARGET_LEGITIMATE_ADDRESS_P mn10300_legitimate_address_p + static void mn10300_encode_section_info (tree, rtx, int); struct gcc_target targetm = TARGET_INITIALIZER; @@ -1900,9 +1904,21 @@ legitimate_pic_operand_p (rtx x) } /* Return TRUE if the address X, taken from a (MEM:MODE X) rtx, is - legitimate, and FALSE otherwise. */ + legitimate, and FALSE otherwise. + + On the mn10300, the value in the address register must be + in the same memory space/segment as the effective address. + + This is problematical for reload since it does not understand + that base+index != index+base in a memory reference. + + Note it is still possible to use reg+reg addressing modes, + it's just much more difficult. For a discussion of a possible + workaround and solution, see the comments in pa.c before the + function record_unscaled_index_insn_codes. */ + bool -legitimate_address_p (enum machine_mode mode, rtx x, int strict) +mn10300_legitimate_address_p (enum machine_mode mode, rtx x, bool strict) { if (CONSTANT_ADDRESS_P (x) && (! flag_pic || legitimate_pic_operand_p (x))) |