Final answer:
The question involves creating two ARMv7 assembly subroutines, ShiftLeftBy2 and CountMatch, to manipulate data in specific ways, along with writing C Program Test Cases to validate their functionality.
Step-by-step explanation:
The question asks for the creation of two ARMv7 assembly subroutines: ShiftLeftBy2 which likely performs a logical shift to the left by two bits on a given value, and CountMatch which might count the number of times a specific value appears within a given set of data.
To address this question, here is an example of how the ShiftLeftBy2 subroutine could be structured:
ShiftLeftBy2:
LSL R0, R0, #2
BX LR
And for CountMatch, the subroutine would involve iterating through items and comparing each one to see if it matches a given value, updating a counter if a match is found:
CountMatch:
MOV R2, #0 ; Initialize counter
Loop:
CMP R1, R3 ; Compare R1 (current item) to R3 (value to match)
BEQ MatchFound
ADD R0, R0, #1 ; Move to next item
CMP R0, R4 ; Check end of array
BNE Loop
BX LR
MatchFound:
ADD R2, R2, #1 ; Increment counter
B Loop
Writing a C Program Test Cases to test these subroutines involves calling each function with a set of inputs and verifying their outputs against expected values.