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#include "config.h"
#include "fpu_ctrl.h"
#ifdef HAVE_INTRIN_H
#include <intrin.h>
#endif
#ifdef HAVE_SSE_INTRINSICS
#include <emmintrin.h>
#elif defined(HAVE_SSE)
#include <xmmintrin.h>
#endif
#if defined(HAVE_SSE) && !defined(_MM_DENORMALS_ZERO_MASK)
/* Some headers seem to be missing these? */
#define _MM_DENORMALS_ZERO_MASK 0x0040u
#define _MM_DENORMALS_ZERO_ON 0x0040u
#endif
#include "cpu_caps.h"
namespace {
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
[[gnu::target("sse")]]
#endif
[[maybe_unused]]
void disable_denormals(unsigned int *state [[maybe_unused]])
{
#if defined(HAVE_SSE_INTRINSICS)
*state = _mm_getcsr();
unsigned int sseState{*state};
sseState &= ~(_MM_FLUSH_ZERO_MASK | _MM_DENORMALS_ZERO_MASK);
sseState |= _MM_FLUSH_ZERO_ON | _MM_DENORMALS_ZERO_ON;
_mm_setcsr(sseState);
#elif defined(HAVE_SSE)
*state = _mm_getcsr();
unsigned int sseState{*state};
sseState &= ~_MM_FLUSH_ZERO_MASK;
sseState |= _MM_FLUSH_ZERO_ON;
if((CPUCapFlags&CPU_CAP_SSE2))
{
sseState &= ~_MM_DENORMALS_ZERO_MASK;
sseState |= _MM_DENORMALS_ZERO_ON;
}
_mm_setcsr(sseState);
#endif
}
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
[[gnu::target("sse")]]
#endif
[[maybe_unused]]
void reset_fpu(unsigned int state [[maybe_unused]])
{
#if defined(HAVE_SSE_INTRINSICS) || defined(HAVE_SSE)
_mm_setcsr(state);
#endif
}
} // namespace
unsigned int FPUCtl::Set() noexcept
{
unsigned int state{};
#if defined(HAVE_SSE_INTRINSICS)
disable_denormals(&state);
#elif defined(HAVE_SSE)
if((CPUCapFlags&CPU_CAP_SSE))
disable_denormals(&state);
#endif
return state;
}
void FPUCtl::Reset(unsigned int state [[maybe_unused]]) noexcept
{
#if defined(HAVE_SSE_INTRINSICS)
reset_fpu(state);
#elif defined(HAVE_SSE)
if((CPUCapFlags&CPU_CAP_SSE))
reset_fpu(state);
#endif
}
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