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On many architectures, integer multiply instructions are slower than other instructions such as integer add and shift, and multiply expressions with power-of-two constant multiplicands and other bit patterns can be replaced with faster instructions.
Example:
The integer multiply expression in the code fragment below can be replaced with an shift expression.
int f (int i)
{
return i * 4;
}
Below is the code fragment after the multiply expression has been translated to a shift expression.
int f (int i)
{
return i << 2;
}
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