diff options
Diffstat (limited to 'gcc/config/rs6000/rs6000.c')
| -rw-r--r-- | gcc/config/rs6000/rs6000.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 8b1d412..b1efc0d 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1208,6 +1208,8 @@ static reg_class_t rs6000_secondary_reload (bool, rtx, reg_class_t, enum machine_mode, struct secondary_reload_info *); +static const reg_class_t *rs6000_ira_cover_classes (void); + const int INSN_NOT_AVAILABLE = -1; static enum machine_mode rs6000_eh_return_filter_mode (void); static bool rs6000_can_eliminate (const int, const int); @@ -1634,6 +1636,9 @@ static const struct default_options rs6000_option_optimization_table[] = #undef TARGET_SECONDARY_RELOAD #define TARGET_SECONDARY_RELOAD rs6000_secondary_reload +#undef TARGET_IRA_COVER_CLASSES +#define TARGET_IRA_COVER_CLASSES rs6000_ira_cover_classes + #undef TARGET_LEGITIMATE_ADDRESS_P #define TARGET_LEGITIMATE_ADDRESS_P rs6000_legitimate_address_p @@ -15283,6 +15288,26 @@ rs6000_secondary_reload_ppc64 (rtx reg, rtx mem, rtx scratch, bool store_p) return; } +/* Target hook to return the cover classes for Integrated Register Allocator. + Cover classes is a set of non-intersected register classes covering all hard + registers used for register allocation purpose. Any move between two + registers of a cover class should be cheaper than load or store of the + registers. The value is array of register classes with LIM_REG_CLASSES used + as the end marker. + + We need two IRA_COVER_CLASSES, one for pre-VSX, and the other for VSX to + account for the Altivec and Floating registers being subsets of the VSX + register set under VSX, but distinct register sets on pre-VSX machines. */ + +static const reg_class_t * +rs6000_ira_cover_classes (void) +{ + static const reg_class_t cover_pre_vsx[] = IRA_COVER_CLASSES_PRE_VSX; + static const reg_class_t cover_vsx[] = IRA_COVER_CLASSES_VSX; + + return (TARGET_VSX) ? cover_vsx : cover_pre_vsx; +} + /* Allocate a 64-bit stack slot to be used for copying SDmode values through if this function has any SDmode references. */ |