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Purpose of Instruction[edit] The BCT instruction subtracts 1 from the value of the contents of the target register specified in the first argument. If the value in the target register after the subtraction is zero, no branch occurs. Otherwise the program branches to the specified address.
Assembler Instructions. Instructions Your Mother Never Told z/Architecture has 280 general instructions. Principles of Operation is R1,0(,R2). Add next 4 bytes. BC. CC0+CC1,NOCARRY Skip if no carry. AL. R1,=F'1'. Add the carry. NOCARRY DS. 0H. AHI. R2,4. Skip to next fullword. BCT. R3,LOOP. Continue, if more.
HLASM - BCT = Branch on CounT. The opcode of the BCT instruction is X'46'. Usage. The BCT instruction is intended for use at the end of a loop. That is, before starting the loop the number of iterations over the loop is set up in the count register. At the end of each pass over the loop the count is decremented and the loop
10 Aug 2011 MEnd. • The generated instruction is. MVC Target(L'&Source),&Source. Just what you wanted! - - -. MVC2 Buffer,=C'A long message' MVC2 handles everything. ? It automatically uses the length attribute of the second operand. SHARE 117, Session 9281. Upgrading Assembler Programs
Use the LA and BCT instructions,. •. Load a table at run time,. •. Use table processing techniques to process a field one character at a time, and. •. Use table processing techniques to process look-ups. Introduction. BAL is probably not the first programming language you have learned. In your other work, you have probably
This document is intended to be used as a quick reference for the mainframe Assembler programmer using HLASM (High Level Assembler) or Assembler/H. The focus is on the 360 and 370 problem-state, non-floating point instructions running in an BCT, Branch on Count Instruction, the operand format is R1,D2(X2,B2)
Example BCT R1,4(R15) Reduce value in R1 by 1 and, if it is not zero, branch * to location in (R15 plus 4 ) Example BCT R1,12(R0) The register is reduced by 1, but the branch will never occur . Instead of a table of branch instructions, a table of absolute or relative addresses (offsets) can be built by the Assembler.
More Branch Instructions. Branch on Count. RX Format: label BCT R,D(X,B). Decrements the value in R by 1 and branches to D(X,B) if the value in R is not 0. If R contains 0, instruction immediately following BCT is executed. RR Format: label BCTR R1,R2. Decrements the value in R1 by 1 and branches to the address in R2
In this article we investigate loop control structures and how they are constructed in assembly language. There are two categories of loops: 1) Counted The most commonly used instruction for creating a counted loop is the Branch On Count instruction, which has mnemonic BCT. The iteration number is first loaded into a
Suppose i have declared a array variable in assembler like aaa dc F'111,222,333,444,555,666' now i want to access it..can any one plz tell me what are instructions requred to access it by using BCT instruction? afroz
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