COEN 20 - Ch 6

Translate into assembly where x, y, z are int32_t

z = (x < y) ? 6 : x ;

		LDR R0, x
		LDR R1, y
		CMP R0, R1   // comparing x to y by subtracting x to y
		BGE EndIf    // if(x >= y) goto EndIf
Then:	LDR R0,=6	 // replace x in R0
EndIf:	STR	R0,z	 

Translate into assembly 

uint16_t a, b ;
if (a > 0 &amp;&amp; a < 100) 
	b = b / 2

		LDRH	R0, a
		CMP		R0, 0
		BLS		EndIf		// if a <= 0, goto EndIf
		CMP		R0, 100
		BHS		EndIf		// if a >= 100, goto EndIf 
		LDRH	R0, b
		LDR		R1, =2
		UDIV	R0, R0, R1
		STRH	R0, b
EndIf:

Translate into assembly where x,y is of int32_t

x = 0;
for (y = 1; y < 1000; y = 2*y){
	x += y;
}	

		LDR		R0, =0
		STR		R0, x
		LDR		R0, =1
		STR 	R0, y
Top:	LDR		R0, y		// load y into R0
		CMP		R0, 1000	// counter for y
		BGE		Done		// if y >= 1000, goto Done
		LDR		R1, x		
		ADD 	R1, R1, R0	// add y + x and store in R1
		STR		R1, x		// store R1 into x
		LSL		R0, R0, 1	// y = 2 * y
		STR		R0, y
		B		Top			// branch to label Top
Done:

Translate into assembly with x,y,z as int32_t

if (x > 10)
	if (x < 20)
		y = 1
	else 
		z = 0

		LDR		R0, x
		CMP		R0, 10
		BLE		Done		// if x <= 10, goto Done
		CMP		R0, 20
		BGE		Else		// if x >= 20, goto Else
Then:	LDR		R0, =1
		STR		R0, y		// y = 1
		B		Done		// branch to Done
Else:	LDR		R0, =0
		STR		R0, z		// z = 0
Done: