diff mbox series

[03/21] softfloat: add xtensa specialization for pickNaNMulAdd

Message ID 20200706234737.32378-4-jcmvbkbc@gmail.com
State New
Headers show
Series target/xtensa: implement double precision FPU | expand

Commit Message

Max Filippov July 6, 2020, 11:47 p.m. UTC 
pickNaNMulAdd logic on Xtensa is the same as pickNaN when applied to
the expression (a * b) + c. So with two pickNaN variants there must be
two pickNaNMulAdd variants.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: "Alex Bennée" <alex.bennee@linaro.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
 fpu/softfloat-specialize.inc.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
diff mbox series

Patch

diff --git a/fpu/softfloat-specialize.inc.c b/fpu/softfloat-specialize.inc.c
index e17327b405c5..6b07d50efad3 100644
--- a/fpu/softfloat-specialize.inc.c
+++ b/fpu/softfloat-specialize.inc.c
@@ -574,6 +574,24 @@  static int pickNaNMulAdd(FloatClass a_cls, FloatClass b_cls, FloatClass c_cls,
     } else {
         return 1;
     }
+#elif defined(TARGET_XTENSA)
+    if (status->use_first_nan) {
+        if (is_nan(a_cls)) {
+            return 0;
+        } else if (is_nan(b_cls)) {
+            return 1;
+        } else {
+            return 2;
+        }
+    } else {
+        if (is_nan(c_cls)) {
+            return 2;
+        } else if (is_nan(b_cls)) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
 #else
     /* A default implementation: prefer a to b to c.
      * This is unlikely to actually match any real implementation.