diff options
Diffstat (limited to 'gcc/config/arc/arc.c')
| -rw-r--r-- | gcc/config/arc/arc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c index 1e0c25e..7b1853b 100644 --- a/gcc/config/arc/arc.c +++ b/gcc/config/arc/arc.c @@ -388,6 +388,7 @@ static bool arc_return_in_memory (const_tree, const_tree); static void arc_init_simd_builtins (void); static bool arc_vector_mode_supported_p (enum machine_mode); +static bool arc_can_use_doloop_p (double_int, double_int, unsigned int, bool); static const char *arc_invalid_within_doloop (const_rtx); static void output_short_suffix (FILE *file); @@ -493,6 +494,9 @@ static void arc_finalize_pic (void); #undef TARGET_VECTOR_MODE_SUPPORTED_P #define TARGET_VECTOR_MODE_SUPPORTED_P arc_vector_mode_supported_p +#undef TARGET_CAN_USE_DOLOOP_P +#define TARGET_CAN_USE_DOLOOP_P arc_can_use_doloop_p + #undef TARGET_INVALID_WITHIN_DOLOOP #define TARGET_INVALID_WITHIN_DOLOOP arc_invalid_within_doloop @@ -5638,6 +5642,23 @@ arc_pass_by_reference (cumulative_args_t ca_v ATTRIBUTE_UNUSED, || TREE_ADDRESSABLE (type))); } +/* Implement TARGET_CAN_USE_DOLOOP_P. */ + +static bool +arc_can_use_doloop_p (double_int iterations, double_int, + unsigned int loop_depth, bool entered_at_top) +{ + if (loop_depth > 1) + return false; + /* Setting up the loop with two sr instructions costs 6 cycles. */ + if (TARGET_ARC700 + && !entered_at_top + && iterations.high == 0 + && iterations.low > 0 + && iterations.low <= (flag_pic ? 6 : 3)) + return false; + return true; +} /* NULL if INSN insn is valid within a low-overhead loop. Otherwise return why doloop cannot be applied. */ |