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cpu: use intrinsics to modify status register

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For better portability. Also only use the code when we can compile with
SSE is available.
This commit is contained in:
Wim Taymans 2021-10-13 15:00:09 +02:00
parent 027dd25980
commit 14fd5425af
2 changed files with 17 additions and 2 deletions
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12
spa/plugins/support/cpu-x86.c
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@ -177,14 +177,22 @@ x86_init(struct impl *impl)
return 0;
}
#if defined(HAVE_SSE)
#include <xmmintrin.h>
#endif
static int x86_zero_denormals(void *object, bool enable)
{
#if defined(HAVE_SSE)
unsigned int mxcsr;
mxcsr = __builtin_ia32_stmxcsr();
mxcsr = _mm_getcsr();
if (enable)
mxcsr |= 0x8040;
else
mxcsr &= ~0x8040;
__builtin_ia32_ldmxcsr(mxcsr);
_mm_setcsr(mxcsr);
return 0;
#else
return -ENOTSUP;
#endif
}