x86_64: libm fixes

* Makefile update for x86_64 target
* amd64 arch files

Change-Id: I8f17e3338bffd89a3086fbddd1e91bb4619eac1b
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>

3 files changed, 222 insertions, 0 deletions

diff --git a/libm/Android.mk b/libm/Android.mk
index 0d2c843..3e769e7 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -226,6 +226,9 @@ libm_arm_src_files := arm/fenv.c
 libm_x86_includes := $(LOCAL_PATH)/i386 $(LOCAL_PATH)/i387
 libm_x86_src_files := i387/fenv.c
 
+libm_x86_64_includes := $(LOCAL_PATH)/amd64 $(LOCAL_PATH)/i387
+libm_x86_64_src_files := amd64/fenv.c
+
 libm_mips_cflags := -fno-builtin-rintf -fno-builtin-rint
 libm_mips_includes := $(LOCAL_PATH)/mips
 libm_mips_src_files := mips/fenv.c
diff --git a/libm/amd64/_fpmath.h b/libm/amd64/_fpmath.h
new file mode 100755
index 0000000..c2a7384
--- /dev/null
+++ b/libm/amd64/_fpmath.h
@@ -0,0 +1,55 @@
+/*-
+ * Copyright (c) 2002, 2003 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.
+ *
+ * $FreeBSD$
+ */
+
+union IEEEl2bits {
+	long double	e;
+	struct {
+		unsigned int	manl	:32;
+		unsigned int	manh	:32;
+		unsigned int	exp	:15;
+		unsigned int	sign	:1;
+		unsigned int	junkl	:16;
+		unsigned int	junkh	:32;
+	} bits;
+	struct {
+		unsigned long	man	:64;
+		unsigned int	expsign	:16;
+		unsigned long	junk	:48;
+	} xbits;
+};
+
+#define	LDBL_NBIT	0x80000000
+#define	mask_nbit_l(u)	((u).bits.manh &= ~LDBL_NBIT)
+
+#define	LDBL_MANH_SIZE	32
+#define	LDBL_MANL_SIZE	32
+
+#define	LDBL_TO_ARRAY32(u, a) do {			\
+	(a)[0] = (uint32_t)(u).bits.manl;		\
+	(a)[1] = (uint32_t)(u).bits.manh;		\
+} while (0)
diff --git a/libm/amd64/fenv.c b/libm/amd64/fenv.c
new file mode 100755
index 0000000..8b49b35
--- /dev/null
+++ b/libm/amd64/fenv.c
@@ -0,0 +1,164 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <machine/fpu.h>
+
+#define	__fenv_static
+#include "fenv.h"
+
+#ifdef __GNUC_GNU_INLINE__
+#error "This file must be compiled with C99 'inline' semantics"
+#endif
+
+const fenv_t __fe_dfl_env = {
+	{ 0xffff0000 | __INITIAL_FPUCW__,
+	  0xffff0000,
+	  0xffffffff,
+	  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
+	},
+	__INITIAL_MXCSR__
+};
+
+extern inline int feclearexcept(int __excepts);
+extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
+
+int
+fesetexceptflag(const fexcept_t *flagp, int excepts)
+{
+	fenv_t env;
+
+	__fnstenv(&env.__x87);
+	env.__x87.__status &= ~excepts;
+	env.__x87.__status |= *flagp & excepts;
+	__fldenv(env.__x87);
+
+	__stmxcsr(&env.__mxcsr);
+	env.__mxcsr &= ~excepts;
+	env.__mxcsr |= *flagp & excepts;
+	__ldmxcsr(env.__mxcsr);
+
+	return (0);
+}
+
+int
+feraiseexcept(int excepts)
+{
+	fexcept_t ex = excepts;
+
+	fesetexceptflag(&ex, excepts);
+	__fwait();
+	return (0);
+}
+
+extern inline int fetestexcept(int __excepts);
+extern inline int fegetround(void);
+extern inline int fesetround(int __round);
+
+int
+fegetenv(fenv_t *envp)
+{
+
+	__fnstenv(&envp->__x87);
+	__stmxcsr(&envp->__mxcsr);
+	/*
+	 * fnstenv masks all exceptions, so we need to restore the
+	 * control word to avoid this side effect.
+	 */
+	__fldcw(envp->__x87.__control);
+	return (0);
+}
+
+int
+feholdexcept(fenv_t *envp)
+{
+	__uint32_t mxcsr;
+
+	__stmxcsr(&mxcsr);
+	__fnstenv(&envp->__x87);
+	__fnclex();
+	envp->__mxcsr = mxcsr;
+	mxcsr &= ~FE_ALL_EXCEPT;
+	mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
+	__ldmxcsr(mxcsr);
+	return (0);
+}
+
+extern inline int fesetenv(const fenv_t *__envp);
+
+int
+feupdateenv(const fenv_t *envp)
+{
+	__uint32_t mxcsr;
+	__uint16_t status;
+
+	__fnstsw(&status);
+	__stmxcsr(&mxcsr);
+	fesetenv(envp);
+	feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
+	return (0);
+}
+
+int
+__feenableexcept(int mask)
+{
+	__uint32_t mxcsr, omask;
+	__uint16_t control;
+
+	mask &= FE_ALL_EXCEPT;
+	__fnstcw(&control);
+	__stmxcsr(&mxcsr);
+	omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
+	control &= ~mask;
+	__fldcw(control);
+	mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
+	__ldmxcsr(mxcsr);
+	return (omask);
+}
+
+int
+__fedisableexcept(int mask)
+{
+	__uint32_t mxcsr, omask;
+	__uint16_t control;
+
+	mask &= FE_ALL_EXCEPT;
+	__fnstcw(&control);
+	__stmxcsr(&mxcsr);
+	omask = ~(control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
+	control |= mask;
+	__fldcw(control);
+	mxcsr |= mask << _SSE_EMASK_SHIFT;
+	__ldmxcsr(mxcsr);
+	return (omask);
+}
+
+__weak_reference(__feenableexcept, feenableexcept);
+__weak_reference(__fedisableexcept, fedisableexcept);