Added English Language description for stwu instruction

diff --git a/openpower/isa/fixedstore.mdwn b/openpower/isa/fixedstore.mdwn
index d12fcbb55b93a92a79e9fecde326698106f7585c..fba9664435b1d05a6a18d82791a16dab251491da 100644 (file)
--- a/openpower/isa/fixedstore.mdwn
+++ b/openpower/isa/fixedstore.mdwn
@@ -262,6 +262,16 @@ Pseudo-code:
     MEM(EA, 4) <- (RS)[XLEN-32:XLEN-1]
     RA <- EA
 
+Description:
+
+Let the effective address (EA) be the sum (RA)+ D.
+RS[32:63] are stored into the word in storage addressed
+by EA.
+
+EA is placed into register RA.
+
+If RA=0, the instruction form is invalid.
+
 Special Registers Altered:
 
     None