auto import from //depot/cupcake/@135843
diff --git a/libm/alpha/fenv.h b/libm/alpha/fenv.h
new file mode 100644
index 0000000..dc7bcb7
--- /dev/null
+++ b/libm/alpha/fenv.h
@@ -0,0 +1,185 @@
+/*-
+ * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/lib/msun/alpha/fenv.h,v 1.3 2005/03/16 19:03:44 das Exp $
+ */
+
+#ifndef _FENV_H_
+#define _FENV_H_
+
+#include <sys/_types.h>
+
+typedef __uint64_t fenv_t;
+typedef __uint16_t fexcept_t;
+
+/* Exception flags */
+#define FE_INVALID 0x02
+#define FE_DIVBYZERO 0x04
+#define FE_OVERFLOW 0x08
+#define FE_UNDERFLOW 0x10
+#define FE_INEXACT 0x20
+#define FE_INTOVF 0x40 /* not maskable */
+#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INTOVF | \
+ FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
+
+/* Rounding modes */
+#define FE_TOWARDZERO 0x00
+#define FE_DOWNWARD 0x01
+#define FE_TONEAREST 0x02
+#define FE_UPWARD 0x03
+#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
+ FE_UPWARD | FE_TOWARDZERO)
+#define _ROUND_SHIFT 58
+
+#define _FPUSW_SHIFT 51
+
+#define __excb() __asm __volatile("excb")
+#define __mf_fpcr(__cw) __asm __volatile("mf_fpcr %0" : "=f" (*(__cw)))
+#define __mt_fpcr(__cw) __asm __volatile("mt_fpcr %0" : : "f" (__cw))
+
+union __fpcr {
+ double __d;
+ fenv_t __bits;
+};
+
+__BEGIN_DECLS
+
+/* Default floating-point environment */
+extern const fenv_t __fe_dfl_env;
+#define FE_DFL_ENV (&__fe_dfl_env)
+
+static __inline int
+feclearexcept(int __excepts)
+{
+ union __fpcr __r;
+
+ __excb();
+ __mf_fpcr(&__r.__d);
+ __r.__bits &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
+ __mt_fpcr(__r.__d);
+ __excb();
+ return (0);
+}
+
+static __inline int
+fegetexceptflag(fexcept_t *__flagp, int __excepts)
+{
+ union __fpcr __r;
+
+ __excb();
+ __mf_fpcr(&__r.__d);
+ __excb();
+ *__flagp = (__r.__bits >> _FPUSW_SHIFT) & __excepts;
+ return (0);
+}
+
+static __inline int
+fesetexceptflag(const fexcept_t *__flagp, int __excepts)
+{
+ union __fpcr __r;
+ fenv_t __xflag, __xexcepts;
+
+ __xflag = (fenv_t)*__flagp << _FPUSW_SHIFT;
+ __xexcepts = (fenv_t)__excepts << _FPUSW_SHIFT;
+ __excb();
+ __mf_fpcr(&__r.__d);
+ __r.__bits &= ~__xexcepts;
+ __r.__bits |= __xflag & __xexcepts;
+ __mt_fpcr(__r.__d);
+ __excb();
+ return (0);
+}
+
+static __inline int
+feraiseexcept(int __excepts)
+{
+
+ /*
+ * XXX Generating exceptions this way does not actually invoke
+ * a userland trap handler when enabled, but neither do
+ * arithmetic operations as far as I can tell. Perhaps there
+ * are more bugs in the kernel trap handler.
+ */
+ fexcept_t __ex = __excepts;
+ fesetexceptflag(&__ex, __excepts);
+ return (0);
+}
+
+static __inline int
+fetestexcept(int __excepts)
+{
+ union __fpcr __r;
+
+ __excb();
+ __mf_fpcr(&__r.__d);
+ __excb();
+ return ((__r.__bits >> _FPUSW_SHIFT) & __excepts);
+}
+
+static __inline int
+fegetround(void)
+{
+ union __fpcr __r;
+
+ /*
+ * No exception barriers should be required here if we assume
+ * that only fesetround() can change the rounding mode.
+ */
+ __mf_fpcr(&__r.__d);
+ return ((int)(__r.__bits >> _ROUND_SHIFT) & _ROUND_MASK);
+}
+
+static __inline int
+fesetround(int __round)
+{
+ union __fpcr __r;
+
+ if (__round & ~_ROUND_MASK)
+ return (-1);
+ __excb();
+ __mf_fpcr(&__r.__d);
+ __r.__bits &= ~((fenv_t)_ROUND_MASK << _ROUND_SHIFT);
+ __r.__bits |= (fenv_t)__round << _ROUND_SHIFT;
+ __mt_fpcr(__r.__d);
+ __excb();
+ return (0);
+}
+
+int fegetenv(fenv_t *__envp);
+int feholdexcept(fenv_t *__envp);
+int fesetenv(const fenv_t *__envp);
+int feupdateenv(const fenv_t *__envp);
+
+#if __BSD_VISIBLE
+
+int feenableexcept(int __mask);
+int fedisableexcept(int __mask);
+int fegetexcept(void);
+
+#endif /* __BSD_VISIBLE */
+
+__END_DECLS
+
+#endif /* !_FENV_H_ */