Added English Language description for stdupx instruction

diff --git a/openpower/isa/pifixedstore.mdwn b/openpower/isa/pifixedstore.mdwn
index c61f9bc1176769769d5756f859b4579fc74ed623..07343c7d861225b798bfc669e4a1f229881f6dd6 100644 (file)
--- a/openpower/isa/pifixedstore.mdwn
+++ b/openpower/isa/pifixedstore.mdwn
@@ -201,6 +201,16 @@ Pseudo-code:
     MEM(ea, 8) <- (RS)
     RA <- EA
 
+Description:
+
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    (RS) is stored into the doubleword in storage
+    addressed by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
 Special Registers Altered:
 
     None