Bounded integer transformation #58
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This transformation transforms expressions with a constrained integer type into sized integer expressions (__sint(N)). This enables backends to implement integers more efficiently than simply choosing a very large size to represent all integers. Signed-off-by: Alastair Reid <[email protected]>
Example usage for testing
dune exec bin/asl2c.py -- --backend=c23 -O0 -Obounded -v --run foo.asl
Signed-off-by: Alastair Reid <[email protected]>
Signed-off-by: Alastair Reid <[email protected]>
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This uses bounds information plus range analysis to change many integers from being fixed size (usually 128 bits) to being exactly the right size for the range of values supported.
This has three effects
This transformation is not complete: it will not infer the size of every variable/value that it could.
But it is enough that code quality is often improved.
And it gives enough of a framework that we can incrementally improve it one operation at a time.