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Pietro Fezzardi
e9d84264ff
This commit does various things oriented at reducing the number of local variables emitted in C: - MarkAssignments now know that @Copy and @Assign involving @LocalVariable only have side effects that affect the local variable itself; this enables to reduce the number of times we're forced to emit a local variable due to interfering side effects - Drop the @AssignmentMarker FunctionTag; AddAssignmentMarkerPass now doesn't emit @AssignmentMarker anymore; instead it emits groups of @LocalVariable, @Copy, and @Assign, which benefit from the previous point - Drop 2 MarkAssignments::Reasons: HasManyUses and HasUsesOutsideOfBB; both these have now been aggregated into the AlwaysAssign reason for simplicity, representing all reasons non involving side effects - Update BeautifyGHAST and how it reasons about side effects when beautifying; before this commit it used @AssignmentMarker, now it looks at @Assign - Simplify ExitSSA; before this commit it was trying hard to be smart on where it emitted the store instructions representing the incoming values of the PHI that was being destroyed; this seemed smart when we originally did it but it generated C code that was not really better to read, so this useless complexity is finally gone