Download CS30 Spring 2007 Quiz 3 - Assembly Instructions and Array Index Access - Prof. Richard Ord and more Quizzes Computer Science in PDF only on Docsity!
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Quiz 3
CSE 30
Spring 2007
a) Write the appropriate save instruction to allocate stack space for the following local variables and any
padding.
short a; char b; unsigned short c; int d; char e; float f;
save _________ , ______________________________ , _________
(Use the formula, not an absolute value)
b) Write the appropriate unoptimized SPARC assembly instructions using the above local variables.
d = b;
a = -9876;
e = ’B’;
a = c;
(OVER)
#2. a) Write the appropriate save instruction to allocate stack space for the following local variable declaration.
short a[9];
save _________ , ______________________________ , _________
(Use the formula, not an absolute value)
b) Write the appropriate instructions to perform the following assignment statements.
a[7] = a[4];
a[5] = a[1];
short ptr; / ptr mapped to %l5 */
ptr = &a[1];
++ptr; /* ptr mapped to %l5 */
short d = ptr; / d mapped to %l2; ptr to %l5 */
ptr = d; / d mapped to %l2; ptr to %l5 */
#3. Write the equivalent C expression for an array index access. Remember scaling is done automatically by
the compiler.
float a[10];
a[i] is equivalent to _____________________________ (equivalent pointer expression).
