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cpu: add zero_denormals method

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Add a method to enable/disable the denormals flush-to-zero and
denormals-as-zero CPU options.

Add a config option to make it possible to disable this again.

Fixes high CPU usage when dealing with denormals, which can happen
in many DSP functions.

Fixes #1681
This commit is contained in:
Wim Taymans 2021-10-11 14:54:48 +02:00
parent 036371c48f
commit 85d5c8cd6c
6 changed files with 70 additions and 3 deletions
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6
spa/plugins/support/cpu.c
View file

@ -78,11 +78,14 @@ static char *read_file(const char *name, char *buffer, size_t len)
# if defined (__i386__) || defined (__x86_64__)
#include "cpu-x86.c"
#define init(t) x86_init(t)
#define impl_cpu_zero_denormals x86_zero_denormals
# elif defined (__arm__) || defined (__aarch64__)
#include "cpu-arm.c"
#define init(t) arm_init(t)
#define impl_cpu_zero_denormals arm_zero_denormals
# else
#define init(t)
#define impl_cpu_zero_denormals NULL
#endif
static uint32_t
@ -197,6 +200,7 @@ static const struct spa_cpu_methods impl_cpu = {
.get_count = impl_cpu_get_count,
.get_max_align = impl_cpu_get_max_align,
.get_vm_type = impl_cpu_get_vm_type,
.zero_denormals = impl_cpu_zero_denormals,
};
static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
@ -265,6 +269,8 @@ impl_init(const struct spa_handle_factory *factory,
this->flags = atoi(str);
if ((str = spa_dict_lookup(info, SPA_KEY_CPU_VM_TYPE)) != NULL)
this->vm_type = atoi(str);
if ((str = spa_dict_lookup(info, SPA_KEY_CPU_ZERO_DENORMALS)) != NULL)
impl_cpu_zero_denormals(this, spa_atob(str));
}
spa_log_debug(this->log, "%p: count:%d align:%d flags:%08x",