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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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8
spa/include/spa/support/cpu.h
View file

@ -113,7 +113,7 @@ struct spa_cpu { struct spa_interface iface; };
struct spa_cpu_methods {
/** the version of the methods. This can be used to expand this
structure in the future */
#define SPA_VERSION_CPU_METHODS 1
#define SPA_VERSION_CPU_METHODS 2
uint32_t version;
/** get CPU flags */
@ -130,6 +130,10 @@ struct spa_cpu_methods {
/* check if running in a VM. Since:1 */
uint32_t (*get_vm_type) (void *object);
/* denormals will be handled as zero, either with FTZ or DAZ.
* Since:2 */
int (*zero_denormals) (void *object, bool enable);
};
#define spa_cpu_method(o,method,version,...) \
@ -146,10 +150,12 @@ struct spa_cpu_methods {
#define spa_cpu_get_count(c) spa_cpu_method(c, get_count, 0)
#define spa_cpu_get_max_align(c) spa_cpu_method(c, get_max_align, 0)
#define spa_cpu_get_vm_type(c) spa_cpu_method(c, get_vm_type, 1)
#define spa_cpu_zero_denormals(c,e) spa_cpu_method(c, zero_denormals, 2, e)
/** keys can be given when initializing the cpu handle */
#define SPA_KEY_CPU_FORCE "cpu.force" /**< force cpu flags */
#define SPA_KEY_CPU_VM_TYPE "cpu.vm.type" /**< force a VM type */
#define SPA_KEY_CPU_ZERO_DENORMALS "cpu.zero.denormals" /**< zero denormals */
/**
* \}