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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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37
spa/plugins/support/cpu-arm.c
View file

@ -123,3 +123,40 @@ arm_init(struct impl *impl)
return 0;
}
static int arm_zero_denormals(void *object, bool enable)
{
#if defined(__aarch64__)
uint64_t cw;
if (enable)
__asm__ __volatile__(
"mrs %0, fpcr \n"
"orr %0, %0, #0x1000000 \n"
"msr fpcr, %0 \n"
"isb \n"
: "=r"(cw)::"memory");
else
__asm__ __volatile__(
"mrs %0, fpcr \n"
"and %0, %0, #~0x1000000 \n"
"msr fpcr, %0 \n"
"isb \n"
: "=r"(cw)::"memory");
#else
uint32_t cw;
if (enable)
__asm__ __volatile__(
"vmrs %0, fpscr \n"
"orr %0, %0, #0x1000000 \n"
"vmsr fpscr, %0 \n"
: "=r"(cw)::"memory");
else
__asm__ __volatile__(
"vmrs %0, fpscr \n"
"and %0, %0, #~0x1000000 \n"
"vmsr fpscr, %0 \n"
: "=r"(cw)::"memory");
#endif
return 0;
}