/* --------------------------------------------------
   Define required labels for EGTAPI
   -------------------------------------------------- */
        .global main, Stop, CodeEnd, DataStart, DataEnd

/* --------------------------------------------------
   if ( x < 0 )
     x = -x
   -------------------------------------------------- */
	.text
main:
        // Test if ( x < 0 )
	movw	r0, #:lower16:x
	movt	r0, #:upper16:x		// r0 = addr(x)
	ldr	r1, [r0]		// r1 = x

	cmp	r1, #0			// Compare x against 0
	bge	ifEnd			// if (x >= 0) branch to ifEnd

        // x = -x;  (1) compute RHS
   	movw    r0, #:lower16:x
   	movt    r0, #:upper16:x         // r0 = addr(x)
   	ldr     r1, [r0]                // r1 = x
   	neg     r1, r1                  // r1 = 0 - r1 (negate)

   	// x = -x;  (2) store r1 into LHS
   	movw    r0, #:lower16:x
   	movt    r0, #:upper16:x         // r0 = addr(x)
   	str     r1, [r0]                // Update x with -x in r0
ifEnd:

Stop:
CodeEnd:
    	nop

/* --------------------------------------------------
   Begin of the permanent program variables
   -------------------------------------------------- */
	.data
DataStart:

x:    .4byte  -4    // x = -4   -- try changing the sign and run the prog

DataEnd:

	.end