diff options
Diffstat (limited to 'gcc/lra-int.h')
| -rw-r--r-- | gcc/lra-int.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/lra-int.h b/gcc/lra-int.h index 8e89518bae0..064722936ba 100644 --- a/gcc/lra-int.h +++ b/gcc/lra-int.h @@ -249,6 +249,25 @@ typedef struct lra_insn_recog_data *lra_insn_recog_data_t; #define LRA_LOSER_COST_FACTOR 6 #define LRA_MAX_REJECT 600 +/* Maximum allowed number of constraint pass iterations after the last + spill pass. It is for preventing LRA cycling in a bug case. */ +#define LRA_MAX_CONSTRAINT_ITERATION_NUMBER 30 + +/* The maximal number of inheritance/split passes in LRA. It should + be more 1 in order to perform caller saves transformations and much + less MAX_CONSTRAINT_ITERATION_NUMBER to prevent LRA to do as many + as permitted constraint passes in some complicated cases. The + first inheritance/split pass has a biggest impact on generated code + quality. Each subsequent affects generated code in less degree. + For example, the 3rd pass does not change generated SPEC2000 code + at all on x86-64. */ +#define LRA_MAX_INHERITANCE_PASSES 2 + +#if LRA_MAX_INHERITANCE_PASSES <= 0 \ + || LRA_MAX_INHERITANCE_PASSES >= LRA_MAX_CONSTRAINT_ITERATION_NUMBER - 8 +#error wrong LRA_MAX_INHERITANCE_PASSES value +#endif + /* lra.c: */ extern FILE *lra_dump_file; |