added english language description for lwzup instruction in the pifixedload.mdwm

diff --git a/openpower/isa/pifixedload.mdwn b/openpower/isa/pifixedload.mdwn
index ddbcdda7cd1aa93ddf1f7e0faf0fadaa164db9df..a9f67ebf5d541655dbc1d63e8741d2e8e33db979 100644 (file)
--- a/openpower/isa/pifixedload.mdwn
+++ b/openpower/isa/pifixedload.mdwn
@@ -176,6 +176,17 @@ Pseudo-code:
     RT <- [0]*32 || MEM(EA, 4)
     RA <- (RA) + EXTS(D)
 
+Description:
+
+    Let the effective address (EA) be the register RA.
+    The halfword in storage addressed by EA is loaded into RT[48:63].
+    RT[0:47] are filled with a copy of bit 0 of the loaded halfword.
+
+    The sum (RA) + D is placed into register RA.
+
+    If RA=0 or RA=RT, the instruction form is invalid.
+
+
 Special Registers Altered:
 
     None