From: Paul Brook <paul@nowt.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [6106] Implement default-NaN mode.
Date: Fri, 19 Dec 2008 13:53:38 +0000 [thread overview]
Message-ID: <E1LDfnO-0005EK-1k@cvs.savannah.gnu.org> (raw)
Revision: 6106
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6106
Author: pbrook
Date: 2008-12-19 13:53:37 +0000 (Fri, 19 Dec 2008)
Log Message:
-----------
Implement default-NaN mode.
Signed-off-by: Paul Brook <paul@codesourcery.com>
Modified Paths:
--------------
trunk/fpu/softfloat-specialize.h
trunk/fpu/softfloat.h
trunk/target-arm/helper.c
Modified: trunk/fpu/softfloat-specialize.h
===================================================================
--- trunk/fpu/softfloat-specialize.h 2008-12-19 13:37:53 UTC (rev 6105)
+++ trunk/fpu/softfloat-specialize.h 2008-12-19 13:53:37 UTC (rev 6106)
@@ -144,6 +144,9 @@
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
bits32 av, bv, res;
+ if ( STATUS(default_nan_mode) )
+ return float32_default_nan;
+
aIsNaN = float32_is_nan( a );
aIsSignalingNaN = float32_is_signaling_nan( a );
bIsNaN = float32_is_nan( b );
@@ -276,6 +279,9 @@
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
bits64 av, bv, res;
+ if ( STATUS(default_nan_mode) )
+ return float64_default_nan;
+
aIsNaN = float64_is_nan( a );
aIsSignalingNaN = float64_is_signaling_nan( a );
bIsNaN = float64_is_nan( b );
@@ -412,6 +418,12 @@
{
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
+ if ( STATUS(default_nan_mode) ) {
+ a.low = floatx80_default_nan_low;
+ a.high = floatx80_default_nan_high;
+ return a;
+ }
+
aIsNaN = floatx80_is_nan( a );
aIsSignalingNaN = floatx80_is_signaling_nan( a );
bIsNaN = floatx80_is_nan( b );
@@ -532,6 +544,12 @@
{
flag aIsNaN, aIsSignalingNaN, bIsNaN, bIsSignalingNaN;
+ if ( STATUS(default_nan_mode) ) {
+ a.low = float128_default_nan_low;
+ a.high = float128_default_nan_high;
+ return a;
+ }
+
aIsNaN = float128_is_nan( a );
aIsSignalingNaN = float128_is_signaling_nan( a );
bIsNaN = float128_is_nan( b );
Modified: trunk/fpu/softfloat.h
===================================================================
--- trunk/fpu/softfloat.h 2008-12-19 13:37:53 UTC (rev 6105)
+++ trunk/fpu/softfloat.h 2008-12-19 13:53:37 UTC (rev 6106)
@@ -190,10 +190,15 @@
#ifdef FLOATX80
signed char floatx80_rounding_precision;
#endif
+ flag default_nan_mode;
} float_status;
void set_float_rounding_mode(int val STATUS_PARAM);
void set_float_exception_flags(int val STATUS_PARAM);
+INLINE void set_default_nan_mode(flag val STATUS_PARAM)
+{
+ STATUS(default_nan_mode) = val;
+}
INLINE int get_float_exception_flags(float_status *status)
{
return STATUS(float_exception_flags);
Modified: trunk/target-arm/helper.c
===================================================================
--- trunk/target-arm/helper.c 2008-12-19 13:37:53 UTC (rev 6105)
+++ trunk/target-arm/helper.c 2008-12-19 13:53:37 UTC (rev 6106)
@@ -2334,6 +2334,8 @@
}
set_float_rounding_mode(i, &env->vfp.fp_status);
}
+ if (changed & (1 << 25))
+ set_default_nan_mode((val & (1 << 25)) != 0, &env->vfp.fp_status);
i = vfp_exceptbits_to_host((val >> 8) & 0x1f);
set_float_exception_flags(i, &env->vfp.fp_status);
next reply other threads:[~2008-12-19 13:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-19 13:53 Paul Brook [this message]
2008-12-19 14:11 ` [Qemu-devel] [6106] Implement default-NaN mode Laurent Desnogues
2008-12-19 14:25 ` Paul Brook
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