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Quiz 4
CSE 30
Fall 2007
#1. On the SPARC architecture, ________________________ are accessed with a positive offset from %fp.
___________ instruction saves the current value of %pc in ___________.
___________ instruction adds ________ to the value %i7 and stores the result in %pc.
___________ do not guarantee their arguments will be evaluated only once.
___________ subroutine is a subroutine that uses save and restore instructions.
___________ instruction should never have a restore instruction in its delay slot.
___________ subroutine is a traditional subroutine that passes parameters on the stack.
Why is it a "bad thing" to return a pointer to a local variable or parameter?
#2. Write the appropriate save instruction to allocate stack space for the following local variable.
struct foo {
char a;
short b;
long c;
char d;
double e;
} fubar;
save
________ , ______________________________________, _________
(Use the formula, not an absolute value)
Write the appropriate unoptimized SPARC assembly instructions using the above local variable.
fubar.b = fubar.c; fubar.d = fubar.a;
(over)
