Added English Language description for sthux instruction

diff --git a/openpower/isa/fixedstore.mdwn b/openpower/isa/fixedstore.mdwn
index 69115ba1feb19fe737f44ddd6e2a713f3859f22f..2dcf6626f94e6230611fe18292aed05349d01898 100644 (file)
--- a/openpower/isa/fixedstore.mdwn
+++ b/openpower/isa/fixedstore.mdwn
@@ -192,6 +192,16 @@ Pseudo-code:
     MEM(EA, 2) <- (RS)[XLEN-16:XLEN-1]
     RA <- EA
 
+Description:
+
+Let the effective address (EA) be the sum (RA)+ (RB).
+RS[48:63] are stored into the halfword in storage
+addressed by EA.
+
+EA is placed into register RA.
+
+If RA=0, the instruction form is invalid.
+
 Special Registers Altered:
 
     None