Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider the following code segment.x = u - t...
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Consider the following code segment.
x = u - t;
y = x * v;
x = y + w;
y = t - z;
y = x * y;
The minimum number of total variables required to convert the above code segment to static single assignment form is __________.
Correct answer is '10'. Can you explain this answer?
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Consider the following code segment.x = u - t;y = x * v;x = y + w;y = ...
x(temp3) = u(temp1) - t(temp2);
y(temp5) = x * v(temp4);
x(temp7) = y + w(temp6);
y(temp9) = t - z(temp8);
y(temp10) = x * y;
Most Upvoted Answer
Consider the following code segment.x = u - t;y = x * v;x = y + w;y = ...
Static Single Assignment (SSA) form:
Static Single Assignment (SSA) form is a property of an intermediate representation (IR) in compilers where each variable is assigned only once and is defined before its use. In SSA form, each assignment creates a new variable, which ensures that there is no variable reassignment.
Given code segment:
x = u - t;
y = x * v;
x = y + w;
y = t - z;
y = x * y;
Converting to SSA form:
To convert the given code segment to SSA form, we need to create new variables for each assignment. Let's go step by step:
1. x = u - t;
- In SSA form, we create a new variable for x: x1 = u - t;
2. y = x * v;
- In SSA form, we create a new variable for y: y1 = x1 * v;
3. x = y + w;
- In SSA form, we create a new variable for x: x2 = y1 + w;
4. y = t - z;
- In SSA form, we create a new variable for y: y2 = t - z;
5. y = x * y;
- In SSA form, we create a new variable for y: y3 = x2 * y2;
Variables required:
To convert the given code segment to SSA form, we need to create new variables for each assignment. The minimum number of total variables required is 10, including the original variables and the new variables created in SSA form.
Original variables:
- u
- t
- v
- w
- z
New variables created in SSA form:
- x1
- y1
- x2
- y2
- y3
Total variables required = 5 (original variables) + 5 (new variables) = 10
Therefore, the minimum number of total variables required to convert the given code segment to SSA form is 10.
Static Single Assignment (SSA) form is a property of an intermediate representation (IR) in compilers where each variable is assigned only once and is defined before its use. In SSA form, each assignment creates a new variable, which ensures that there is no variable reassignment.
Given code segment:
x = u - t;
y = x * v;
x = y + w;
y = t - z;
y = x * y;
Converting to SSA form:
To convert the given code segment to SSA form, we need to create new variables for each assignment. Let's go step by step:
1. x = u - t;
- In SSA form, we create a new variable for x: x1 = u - t;
2. y = x * v;
- In SSA form, we create a new variable for y: y1 = x1 * v;
3. x = y + w;
- In SSA form, we create a new variable for x: x2 = y1 + w;
4. y = t - z;
- In SSA form, we create a new variable for y: y2 = t - z;
5. y = x * y;
- In SSA form, we create a new variable for y: y3 = x2 * y2;
Variables required:
To convert the given code segment to SSA form, we need to create new variables for each assignment. The minimum number of total variables required is 10, including the original variables and the new variables created in SSA form.
Original variables:
- u
- t
- v
- w
- z
New variables created in SSA form:
- x1
- y1
- x2
- y2
- y3
Total variables required = 5 (original variables) + 5 (new variables) = 10
Therefore, the minimum number of total variables required to convert the given code segment to SSA form is 10.
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Consider the following code segment.x = u - t;y = x * v;x = y + w;y = t - z;y = x * y;The minimum number of total variables required to convert the above code segment to static single assignment form is __________.Correct answer is '10'. Can you explain this answer?
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