diff options
Diffstat (limited to 'gcc/regs.h')
| -rw-r--r-- | gcc/regs.h | 18 |
1 files changed, 18 insertions, 0 deletions
@@ -86,6 +86,24 @@ extern varray_type reg_n_info; #define REG_FREQ(N) (VARRAY_REG (reg_n_info, N)->freq) +/* The weights for each insn varries from 0 to REG_FREQ_BASE. + This constant does not need to be high, as in infrequently executed + regions we want to count instructions equivalently to optimize for + size instead of speed. */ +#define REG_FREQ_MAX 1000 + +/* Compute register frequency from the BB frequency. When optimizing for size, + or profile driven feedback is available and the function is never executed, + frequency is always equivalent. Otherwise rescale the basic block + frequency. */ +#define REG_FREQ_FROM_BB(bb) (optimize_size \ + || (flag_branch_probabilities \ + && !ENTRY_BLOCK_PTR->count) \ + ? REG_FREQ_MAX \ + : ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\ + ? ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\ + : 1) + /* Indexed by n, gives number of times (REG n) is set. ??? both regscan and flow allocate space for this. We should settle on just copy. */ |