Merge glibc-ports into ports/ directory.glibc-2.16-ports-merge

1 files changed, 101 insertions, 0 deletions

diff --git a/ports/sysdeps/hppa/fpu/fraiseexcpt.c b/ports/sysdeps/hppa/fpu/fraiseexcpt.c
new file mode 100644
index 0000000000..4b0161a6e9
--- /dev/null
+++ b/ports/sysdeps/hppa/fpu/fraiseexcpt.c
@@ -0,0 +1,101 @@
+/* Raise given exceptions.
+   Copyright (C) 1997, 1999, 2000, 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Huggins-Daines <dhd@debian.org>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <float.h>
+#include <math.h>
+
+/* Please see section 10, 
+   page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */
+
+int
+feraiseexcept (int excepts)
+{
+  /* Raise exceptions represented by EXCEPTS.  But we must raise only one
+     signal at a time.  It is important that if the overflow/underflow
+     exception and the divide by zero exception are given at the same
+     time, the overflow/underflow exception follows the divide by zero
+     exception.  */
+
+  /* We do these bits in assembly to be certain GCC doesn't optimize
+     away something important, and so we can force delayed traps to
+     occur. */
+
+  /* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */
+	
+  /* First: Invalid exception.  */
+  if (excepts & FE_INVALID)
+    {
+      /* One example of a invalid operation is 0 * Infinity.  */
+      double d = HUGE_VAL;
+      __asm__ __volatile__ (
+		"	fcpy,dbl %%fr0,%%fr22\n"
+		"	fmpy,dbl %0,%%fr22,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : : "%fr22" );
+    }
+
+  /* Second: Division by zero.  */
+  if (excepts & FE_DIVBYZERO)
+    {
+      double d = 1.0;
+      __asm__ __volatile__ (
+		"	fcpy,dbl %%fr0,%%fr22\n"
+		"	fdiv,dbl %0,%%fr22,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : : "%fr22" );
+    }
+
+  /* Third: Overflow.  */
+  if (excepts & FE_OVERFLOW)
+    {
+      double d = DBL_MAX;
+      __asm__ __volatile__ (
+		"	fadd,dbl %0,%0,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) );
+    }
+
+  /* Fourth: Underflow.  */
+  if (excepts & FE_UNDERFLOW)
+    {
+      double d = DBL_MIN;
+      double e = 3.0;
+      __asm__ __volatile__ (
+		"	fdiv,dbl %0,%1,%0\n"
+		"	fldd 0(%%sr0,%%sp),%0"
+		: "+f" (d) : "f" (e) );
+    }
+
+  /* Fifth: Inexact */
+  if (excepts & FE_INEXACT)
+    {
+      double d = M_PI;
+      double e = 69.69;
+      __asm__ __volatile__ (
+		"	fdiv,dbl %0,%1,%%fr22\n"
+		"	fcnvfxt,dbl,sgl %%fr22,%%fr22L\n"
+		"	fldd 0(%%sr0,%%sp),%%fr22"
+		: : "f" (d), "f" (e) : "%fr22" );
+    }
+
+  /* Success.  */
+  return 0;
+}
+libm_hidden_def (feraiseexcept)