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| author | Pat Haugen <pthaugen@us.ibm.com> | 2016-12-21 19:15:32 +0000 |
|---|---|---|
| committer | Pat Haugen <pthaugen@gcc.gnu.org> | 2016-12-21 19:15:32 +0000 |
| commit | 35f4cbd4489519983a4f64da846be8352f611879 (patch) | |
| tree | 7c8dcd625b28a3db9ca014fc984ce8e24a152777 /gcc | |
| parent | 0856b5d78d26690b2411053967aee57f37486d11 (diff) | |
| download | gcc-35f4cbd4489519983a4f64da846be8352f611879.zip gcc-35f4cbd4489519983a4f64da846be8352f611879.tar.gz gcc-35f4cbd4489519983a4f64da846be8352f611879.tar.bz2 | |
re PR rtl-optimization/11488 (Pre-regalloc scheduling severely worsens performance)
PR rtl-optimization/11488
* common/config/rs6000/rs6000-common.c
(rs6000_option_optimization_table): Enable -fsched-pressure.
* config/rs6000/rs6000.c (TARGET_COMPUTE_PRESSURE_CLASSES): Define
target hook.
(rs6000_option_override_internal): Set default -fsched-pressure algorithm.
(rs6000_compute_pressure_classes): Implement target hook.
From-SVN: r243866
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 10 | ||||
| -rw-r--r-- | gcc/common/config/rs6000/rs6000-common.c | 2 | ||||
| -rw-r--r-- | gcc/config/rs6000/rs6000.c | 35 |
3 files changed, 47 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0a7f34a..1454cce 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2016-12-21 Pat Haugen <pthaugen@us.ibm.com> + + PR rtl-optimization/11488 + * common/config/rs6000/rs6000-common.c + (rs6000_option_optimization_table): Enable -fsched-pressure. + * config/rs6000/rs6000.c (TARGET_COMPUTE_PRESSURE_CLASSES): Define + target hook. + (rs6000_option_override_internal): Set default -fsched-pressure algorithm. + (rs6000_compute_pressure_classes): Implement target hook. + 2016-12-21 Bill Seurer <seurer@linux.vnet.ibm.com> PR sanitizer/65479 diff --git a/gcc/common/config/rs6000/rs6000-common.c b/gcc/common/config/rs6000/rs6000-common.c index af297ba..88e5ff6 100644 --- a/gcc/common/config/rs6000/rs6000-common.c +++ b/gcc/common/config/rs6000/rs6000-common.c @@ -32,6 +32,8 @@ static const struct default_options rs6000_option_optimization_table[] = { { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 }, + /* Enable -fsched-pressure for first pass instruction scheduling. */ + { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 }, { OPT_LEVELS_NONE, 0, NULL, 0 } }; diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index a870d60..77bb548 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -1807,6 +1807,9 @@ static const struct attribute_spec rs6000_attribute_table[] = #undef TARGET_LRA_P #define TARGET_LRA_P rs6000_lra_p +#undef TARGET_COMPUTE_PRESSURE_CLASSES +#define TARGET_COMPUTE_PRESSURE_CLASSES rs6000_compute_pressure_classes + #undef TARGET_CAN_ELIMINATE #define TARGET_CAN_ELIMINATE rs6000_can_eliminate @@ -5107,6 +5110,12 @@ rs6000_option_override_internal (bool global_init_p) global_options.x_param_values, global_options_set.x_param_values); + /* Use the 'model' -fsched-pressure algorithm by default. */ + maybe_set_param_value (PARAM_SCHED_PRESSURE_ALGORITHM, + SCHED_PRESSURE_MODEL, + global_options.x_param_values, + global_options_set.x_param_values); + /* If using typedef char *va_list, signal that __builtin_va_start (&ap, 0) can be optimized to ap = __builtin_next_arg (0). */ @@ -37961,6 +37970,32 @@ rs6000_lra_p (void) return TARGET_LRA; } +/* Compute register pressure classes. We implement the target hook to avoid + IRA picking something like NON_SPECIAL_REGS as a pressure class, which can + lead to incorrect estimates of number of available registers and therefor + increased register pressure/spill. */ +static int +rs6000_compute_pressure_classes (enum reg_class *pressure_classes) +{ + int n; + + n = 0; + pressure_classes[n++] = GENERAL_REGS; + if (TARGET_VSX) + pressure_classes[n++] = VSX_REGS; + else + { + if (TARGET_ALTIVEC) + pressure_classes[n++] = ALTIVEC_REGS; + if (TARGET_HARD_FLOAT && TARGET_FPRS) + pressure_classes[n++] = FLOAT_REGS; + } + pressure_classes[n++] = CR_REGS; + pressure_classes[n++] = SPECIAL_REGS; + + return n; +} + /* Given FROM and TO register numbers, say whether this elimination is allowed. Frame pointer elimination is automatically handled. |