From 20ef8bf390541339f068676f9d14061fe2f5e115 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Thu, 31 Dec 2020 16:47:12 -0800
Subject: Move cpu_caps and fpu_ctrl to core

---
 core/fpu_ctrl.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 core/fpu_ctrl.cpp

(limited to 'core/fpu_ctrl.cpp')

diff --git a/core/fpu_ctrl.cpp b/core/fpu_ctrl.cpp
new file mode 100644
index 00000000..24021c7d
--- /dev/null
+++ b/core/fpu_ctrl.cpp
@@ -0,0 +1,54 @@
+
+#include "config.h"
+
+#include "fpu_ctrl.h"
+
+#ifdef HAVE_INTRIN_H
+#include <intrin.h>
+#endif
+#ifdef HAVE_SSE_INTRINSICS
+#include <xmmintrin.h>
+#endif
+
+#include "cpu_caps.h"
+
+
+FPUCtl::FPUCtl()
+{
+#if defined(HAVE_SSE_INTRINSICS)
+    this->sse_state = _mm_getcsr();
+    unsigned int sseState = this->sse_state;
+    sseState |= 0x8000; /* set flush-to-zero */
+    sseState |= 0x0040; /* set denormals-are-zero */
+    _mm_setcsr(sseState);
+
+#elif defined(__GNUC__) && defined(HAVE_SSE)
+
+    if((CPUCapFlags&CPU_CAP_SSE))
+    {
+        __asm__ __volatile__("stmxcsr %0" : "=m" (*&this->sse_state));
+        unsigned int sseState = this->sse_state;
+        sseState |= 0x8000; /* set flush-to-zero */
+        if((CPUCapFlags&CPU_CAP_SSE2))
+            sseState |= 0x0040; /* set denormals-are-zero */
+        __asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
+    }
+#endif
+
+    this->in_mode = true;
+}
+
+void FPUCtl::leave()
+{
+    if(!this->in_mode) return;
+
+#if defined(HAVE_SSE_INTRINSICS)
+    _mm_setcsr(this->sse_state);
+
+#elif defined(__GNUC__) && defined(HAVE_SSE)
+
+    if((CPUCapFlags&CPU_CAP_SSE))
+        __asm__ __volatile__("ldmxcsr %0" : : "m" (*&this->sse_state));
+#endif
+    this->in_mode = false;
+}
-- 
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