From: Aurelien Jarno <aurelien@aurel32.net>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [6511] Add various NaN-handling macros
Date: Wed, 04 Feb 2009 09:05:54 +0000 [thread overview]
Message-ID: <E1LUdhi-0006PS-G0@cvs.savannah.gnu.org> (raw)
Revision: 6511
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6511
Author: aurel32
Date: 2009-02-04 09:05:53 +0000 (Wed, 04 Feb 2009)
Log Message:
-----------
Add various NaN-handling macros
These simplify the implementation of the floating-point Altivec
instructions and reduce clutter.
Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Modified Paths:
--------------
trunk/target-ppc/op_helper.c
Modified: trunk/target-ppc/op_helper.c
===================================================================
--- trunk/target-ppc/op_helper.c 2009-02-03 23:06:34 UTC (rev 6510)
+++ trunk/target-ppc/op_helper.c 2009-02-04 09:05:53 UTC (rev 6511)
@@ -1965,6 +1965,23 @@
for (index = ARRAY_SIZE(r->element)-1; index >= 0; index--)
#endif
+/* If X is a NaN, store the corresponding QNaN into RESULT. Otherwise,
+ * execute the following block. */
+#define DO_HANDLE_NAN(result, x) \
+ if (float32_is_nan(x) || float32_is_signaling_nan(x)) { \
+ CPU_FloatU __f; \
+ __f.f = x; \
+ __f.l = __f.l | (1 << 22); /* Set QNaN bit. */ \
+ result = __f.f; \
+ } else
+
+#define HANDLE_NAN1(result, x) \
+ DO_HANDLE_NAN(result, x)
+#define HANDLE_NAN2(result, x, y) \
+ DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y)
+#define HANDLE_NAN3(result, x, y, z) \
+ DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y) DO_HANDLE_NAN(result, z)
+
/* Saturating arithmetic helpers. */
#define SATCVT(from, to, from_type, to_type, min, max, use_min, use_max) \
static always_inline to_type cvt##from##to (from_type x, int *sat) \
@@ -2818,6 +2835,10 @@
#undef UPKHI
#undef UPKLO
+#undef DO_HANDLE_NAN
+#undef HANDLE_NAN1
+#undef HANDLE_NAN2
+#undef HANDLE_NAN3
#undef VECTOR_FOR_INORDER_I
#undef HI_IDX
#undef LO_IDX
reply other threads:[~2009-02-04 9:05 UTC|newest]
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