Estimates optimization effects from complete loop unrolling.
Declared in <llvm/Analysis/LoopUnrollAnalyzer.h>
class UnrolledInstAnalyzer;This class is used to get an estimate of the optimization effects that we could get from complete loop unrolling. It comes from the fact that some loads might be replaced with concrete constant values and that could trigger a chain of instruction simplifications.
E.g. we might have: int a[]= {0, 1, 0}; v = 0; for (i = 0; i < 3; i ++) v += b[i]*a[i]; If we completely unroll the loop, we would get: v = b[0]*a[0]+ b[1]*a[1]+ b[2]*a[2] Which then will be simplified to: v = b[0]* 0 + b[1]* 1 + b[2]* 0 And finally: v = b[1]
| Name | Description |
|---|---|
UnrolledInstAnalyzer [constructor] | Construct an analyzer for one simulated unrolled iteration. |
| Name | Description |
|---|---|
visit | Expose the InstVisitor visit entry points. |
| Name | Description |
|---|---|
llvm::InstVisitor | Base class for instruction visitors |