From 09b96ea041546cc645313936516c4ee727e6ea39 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@airs.com>
Date: Fri, 8 Jul 2005 18:41:54 +0000
Subject: [PATCH] 	* sim-fpu.c (pack_fpu): If SIM_QUIET_NAN_NEGATED is
 defined, use a 	different fraction for a quiet NaN. 	(unpack_fpu):
 Likewise.

---
 sim/common/ChangeLog |  6 ++++++
 sim/common/sim-fpu.c | 13 ++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/sim/common/ChangeLog b/sim/common/ChangeLog
index 7a43a29bfc..c2ef9e0a8d 100644
--- a/sim/common/ChangeLog
+++ b/sim/common/ChangeLog
@@ -1,3 +1,9 @@
+2005-07-08  Ian Lance Taylor  <ian@airs.com>
+
+	* sim-fpu.c (pack_fpu): If SIM_QUIET_NAN_NEGATED is defined, use a
+	different fraction for a quiet NaN.
+	(unpack_fpu): Likewise.
+
 2005-07-08  Ben Elliston  <bje@au.ibm.com>
 
 	* callback.c: Remove ANSI_PROTOTYPES conditional code.
diff --git a/sim/common/sim-fpu.c b/sim/common/sim-fpu.c
index 845248adb5..c9678bdc09 100644
--- a/sim/common/sim-fpu.c
+++ b/sim/common/sim-fpu.c
@@ -201,7 +201,11 @@ pack_fpu (const sim_fpu *src,
       /* force fraction to correct class */
       fraction = src->fraction;
       fraction >>= NR_GUARDS;
+#ifdef SIM_QUIET_NAN_NEGATED
+      fraction |= QUIET_NAN - 1;
+#else
       fraction |= QUIET_NAN;
+#endif
       break;
     case sim_fpu_class_snan:
       sign = src->sign;
@@ -362,10 +366,17 @@ unpack_fpu (sim_fpu *dst, unsigned64 packed, int is_double)
 	}
       else
 	{
+	  int qnan;
+
 	  /* Non zero fraction, means NaN */
 	  dst->sign = sign;
 	  dst->fraction = (fraction << NR_GUARDS);
-	  if (fraction >= QUIET_NAN)
+#ifdef SIM_QUIET_NAN_NEGATED
+	  qnan = (fraction & QUIET_NAN) == 0;
+#else
+	  qnan = fraction >= QUIET_NAN;
+#endif
+	  if (qnan)
 	    dst->class = sim_fpu_class_qnan;
 	  else
 	    dst->class = sim_fpu_class_snan;