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C/C++

Type-Based Alias Analysis

By Mark Mitchell, October 01, 2000

Aliasing issues make it difficult for compilers to generate code that runs as fast as you might hope. Luckily, the C++ type system makes clear what can and cannot alias.
Oct00: Type-Based Alias Analysis 


<b>(a) </b>
double d = 2.0;
int *ip = (int*) &d;
*ip = 3;
d *= 2;

<b>(b) </b>
double d = 2.0;
int *ip = (int*) &d;
d *= 2;
*ip = 3;

Example 8: Illegal code can produce surprising results. (a) Original code; (b) compiler's transformation.



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