create base/fenv.c to standerdize fenv across platforms. It's a c file and not a cpp file because c99

(which defines fenv) doesn't necessarily extend to c++ and it is a problem with solaris. If really
desired this could wrap the ieeefp interface found in bsd* as well, but I see no need at the moment.

src/arch/alpha/isa/fp.isa:
src/arch/sparc/isa/formats/basic.isa:
    use m5_fesetround()/m5_fegetround() istead of fenv interface directly
src/arch/sparc/isa/includes.isa:
    use base/fenv instead of fenv directly
src/base/SConscript:
    add fenv to sconscript
src/base/fenv.hh:
src/base/random.cc:
    m5 implementation to standerdize fenv across platforms.

--HG--
extra : convert_revision : 38d2629affd964dcd1a5ab0db4ac3cb21438e72c

4 files changed, 71 insertions, 15 deletions

diff --git a/src/base/SConscript b/src/base/SConscript
index 5e4aaafc2..cc9d06a0e 100644
--- a/src/base/SConscript
+++ b/src/base/SConscript
@@ -57,6 +57,7 @@ Source('circlebuf.cc')
 Source('cprintf.cc')
 Source('crc.cc')
 Source('fast_alloc.cc')
+Source('fenv.c')
 Source('fifo_buffer.cc')
 Source('hostinfo.cc')
 Source('hybrid_pred.cc')
diff --git a/src/base/fenv.c b/src/base/fenv.c
new file mode 100644
index 000000000..269913a60
--- /dev/null
+++ b/src/base/fenv.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2007 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * 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;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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.
+ *
+ * Authors: Ali Saidi
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+#include <fenv.h>
+
+void m5_fesetround(int rm);
+int m5_fegetround();
+
+static const int m5_round_ops[] =  {FE_DOWNWARD, FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD};
+
+void m5_fesetround(int rm)
+{
+    assert(rm > 0 && rm < 4);
+    fesetround(m5_round_ops[rm]);
+}
+
+int m5_fegetround()
+{
+    int x;
+    int rm = fegetround();
+    for(x = 0; x < 4; x++)
+        if (m5_round_ops[x] == rm)
+            return x;
+    abort();
+    return 0;
+}
+
diff --git a/src/base/fenv.hh b/src/base/fenv.hh
index 013d2f09b..42b383888 100644
--- a/src/base/fenv.hh
+++ b/src/base/fenv.hh
@@ -33,20 +33,21 @@
 
 #include "config/use_fenv.hh"
 
-#if USE_FENV
-
-#include <fenv.h>
+#define M5_FE_DOWNWARD     0
+#define M5_FE_TONEAREST    1
+#define M5_FE_TOWARDZERO   2
+#define M5_FE_UPWARD       3
 
+#if USE_FENV
+extern "C" {
+void m5_fesetround(int rm);
+int m5_fegetround();
+}
 #else
 
 // Dummy definitions to allow code to compile w/o a real <fenv.h>.
-
-#define FE_TONEAREST    0
-#define FE_DOWNWARD     0
-#define FE_UPWARD       0
-#define FE_TOWARDZERO   0
-
-inline int fesetround(int rounding_mode) { return 0; }
+inline void m5_fesetround(int rm) { ; }
+inline int m5_fegetround() {return 0; }
 
 #endif // USE_FENV
 
diff --git a/src/base/random.cc b/src/base/random.cc
index ceab337d9..5390ceb46 100644
--- a/src/base/random.cc
+++ b/src/base/random.cc
@@ -29,9 +29,6 @@
  *          Ali Saidi
  */
 
-#if defined(__sun)
-#include <ieeefp.h>
-#endif
 #ifdef __SUNPRO_CC
 #include <stdlib.h>
 #include <math.h>
@@ -61,9 +58,10 @@ m5round(double r)
 {
 #if defined(__sun)
     double val;
-    fp_rnd oldrnd = fpsetround(FP_RN);
+    int oldrnd = m5_fegetround();
+    m5_fesetround(M5_FP_TONEAREST);
     val = rint(r);
-    fpsetround(oldrnd);
+    m5_fesetround(oldrnd);
     return val;
 #else
     return round(r);