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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
This commit is contained in:
Pat Haugen 2016-12-21 19:15:32 +00:00 committed by Pat Haugen
parent 0856b5d78d
commit 35f4cbd448
3 changed files with 47 additions and 0 deletions
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10
gcc/ChangeLog
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@ -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

2
gcc/common/config/rs6000/rs6000-common.c
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@ -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 }
};

35
gcc/config/rs6000/rs6000.c
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@ -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.