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