Load Halfword Functional Testing

Introduction

This test case includes a Job Script and High Level Assembler (HLASM) that will perform functional testing of the Load Halfword (LH) instruction. The results of the functional testing will be written to a user log file. The content of the affected General Purpose registers will be presented using hexadecimal notation.

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Description of LH

This test case includes a Job Script and High Level Assembler (HLASM) that will perform functional testing of the Load Halfword (LH) instruction. The results of the functional testing will be written to a user log file. The content of the affected General Purpose registers will be presented using hexadecimal notation.

The two bytes (halfword) located at the storage address specified by operand-2 (x2+b2+d2) is treated as a 16 bit, signed binary integer and is loaded into the rightmost two bytes (bits 16-31) of the register specified by operand-1 (r1). The leftmost two bytes (bits 0-15) of the register specified by operand-1 (r1) are filled based on the sign bit from operand-2. For example, if operand-2 contains a positive value then the leftmost two bytes will be x'0000'. if operand-2 contains a negative value then the leftmost two bytes will be x'FFFF'.

Review Results

The following shows the content of the user log file after the program is executed.

* AILH00A1 is Starting, Demo for LH Instruction...
* AILH00A1 Demo for HLASM, LH Instruction     v24.01.01 http://www.simotime.com
* AILH00A1 Copyright 1987-2024    SimoTime Technologies     All Rights Reserved
* AILH00A1 Enter Task-001, Initialize Register 8 (R8) and review content
....:....1....:....2....:....3....:....4....:....5....:....6....:....7....:....8
55555555
* AILH00A1 Leave Task-001, Previous line shows content of R8 using Hex-Notation
*
* AILH00A1 Enter Task-002, Execute LH Instruction and Review register content
* AILH00A1 Mnemonic Format . . . . LH    R8,HWP_123 where HWP_123 = +123
....:....1....:....2....:....3....:....4....:....5....:....6....:....7....:....8
0000007B
* AILH00A1 Leave Task-002, Previous line shows content of R8 using Hex-Notation
*
* AILH00A1 Enter Task-003, Execute LH Instruction and Review register content
* AILH00A1 Mnemonic Format . . . . LH    R8,HWN_123 where HWN_123 = -123
....:....1....:....2....:....3....:....4....:....5....:....6....:....7....:....8
FFFFEDCD
* AILH00A1 Leave Task-003, Previous line shows content of R8 using Hex-Notation
*
* AILH00A1 Enter Task-004, End of Program processing
* AILH00A1 is Finished, Demo for LH Instruction...

Summary

This test case will perform functional testing of the Load Halfword (LH) instruction. The results of the functional testing will be written to a user log file. The content of the affected General Purpose registers will be presented using hexadecimal notation.

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