diff options
| author | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-07-30 20:03:37 +0000 |
|---|---|---|
| committer | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-07-30 20:03:37 +0000 |
| commit | eefdec482d3b01c97ab6d360dbee968b9ca9c252 (patch) | |
| tree | aa952727c06ed38ed797f094dd095bd14f5da5f4 /gcc/regs.h | |
| parent | 7572bd481e5ce1c6ea23bd61461bc3adb55ba901 (diff) | |
| download | gcc-eefdec482d3b01c97ab6d360dbee968b9ca9c252.tar.gz | |
* flow.c (mark_set_1): Use REG_FREQ_FROM_BB.
(attempt_auto_inc): LIkewise.
(mark_used_reg): Likewise.
(try_pre_increment_1): Likewise.
* regclass.c (regclass): Likewise.
* global.c (allocno_compare): Update comment; change scaling factor.
* local-alloc.c (QTY_CMP_PRI): Likewise.
* regs.h (REG_FREQ_FROM_BB): New.
(REG_FREQ_MAX): Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44483 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/regs.h')
| -rw-r--r-- | gcc/regs.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/regs.h b/gcc/regs.h index 3857c829dc1..e852d6d3212 100644 --- a/gcc/regs.h +++ b/gcc/regs.h @@ -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. */ |