[LIBM] Import win-libm from AMD

Source: https://github.com/amd/win-libm

sdk/lib/crt/math/libm_sse2/sqrt.c

@@ -0,0 +1,88 @@
+
+/*******************************************************************************
+MIT License
+-----------
+
+Copyright (c) 2002-2019 Advanced Micro Devices, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this Software and associated documentaon files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*******************************************************************************/
+
+#include "libm.h"
+#include "libm_util.h"
+
+#if USE_SOFTWARE_SQRT
+#define USE_SQRT_AMD_INLINE
+#endif
+#define USE_NAN_WITH_FLAGS
+#define USE_HANDLE_ERROR
+#include "libm_inlines.h"
+#if USE_SOFTWARE_SQRT
+#undef USE_SQRT_AMD_INLINE
+#endif
+#undef USE_NAN_WITH_FLAGS
+#undef USE_HANDLE_ERROR
+
+#include "libm_errno.h"
+
+#pragma function(sqrt)
+
+double sqrt(double x)
+{
+#if USE_SOFTWARE_SQRT
+  return sqrt_amd_inline(x);
+#else
+  double r;
+  unsigned long ux;
+  GET_BITS_DP64(x, ux);
+
+  /* Check for special cases for Microsoft error handling */
+  if ((ux & PINFBITPATT_DP64) == PINFBITPATT_DP64)
+    {
+      /* x is infinity, or NaN */
+      if (ux & MANTBITS_DP64)
+        {
+          /* NaN  of some sort */
+          /* If it's a signaling NaN, convert to QNaN */
+          return _handle_error("sqrt", OP_SQRT, ux|0x0008000000000000, 
+                                  _DOMAIN, 0,EDOM, x, 0.0, 1);
+        }
+      else
+        {
+          /* +/-infinity  */
+          if (ux & SIGNBIT_DP64)
+            {
+              /* - infinity */
+                return _handle_error("sqrt", OP_SQRT, INDEFBITPATT_DP64, 
+                                    _DOMAIN, AMD_F_INVALID, EDOM, x, 0.0, 1);
+            }
+          /* positive infinite is not a problem */
+        }
+    }
+  if ((ux & SIGNBIT_DP64)&&(ux & ~SIGNBIT_DP64))   /* if x < zero */
+    {
+        return _handle_error("sqrt", OP_SQRT, INDEFBITPATT_DP64, 
+                            _DOMAIN, AMD_F_INVALID, EDOM, x, 0.0, 1);
+    }
+
+      /* VC++ intrinsic call */
+  _mm_store_sd(&r, _mm_sqrt_sd(_mm_setzero_pd(), _mm_load_sd(&x)));
+  return r;
+#endif
+}