🛠️🐜 Antkeeper superbuild with dependencies included
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61 lines
1.4 KiB
61 lines
1.4 KiB
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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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#ifndef _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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#endif
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#include "cpu_caps.h"
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void FPUCtl::enter() noexcept
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{
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if(this->in_mode) return;
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#if defined(HAVE_SSE_INTRINSICS)
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this->sse_state = _mm_getcsr();
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unsigned int sseState{this->sse_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(__GNUC__) && defined(HAVE_SSE)
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if((CPUCapFlags&CPU_CAP_SSE))
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{
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__asm__ __volatile__("stmxcsr %0" : "=m" (*&this->sse_state));
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unsigned int sseState{this->sse_state};
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sseState |= 0x8000; /* set flush-to-zero */
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if((CPUCapFlags&CPU_CAP_SSE2))
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sseState |= 0x0040; /* set denormals-are-zero */
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__asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
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}
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#endif
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this->in_mode = true;
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}
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void FPUCtl::leave() noexcept
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{
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if(!this->in_mode) return;
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#if defined(HAVE_SSE_INTRINSICS)
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_mm_setcsr(this->sse_state);
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#elif defined(__GNUC__) && defined(HAVE_SSE)
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if((CPUCapFlags&CPU_CAP_SSE))
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__asm__ __volatile__("ldmxcsr %0" : : "m" (*&this->sse_state));
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#endif
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this->in_mode = false;
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}
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