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Author SHA1 Message Date
Richard SmithandChandler Carruth a3154356f0 Distinguish between template constants and symbolic constants. (#3595) 
This is accomplished by tracking an extra bit on the ID we store in the
constant values table, and propagating that from subexpressions to the
enclosing expression. This extra bit is not yet computed correctly for
types; that will be addressed in later PRs.

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Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
 2024-01-12 02:56:22 +00:00
Richard Smith a2012d4777 Add evaluation for conversion instructions. (#3594) 
Also some finessing of evaluation for other instruction kinds and some
additional testing.
 2024-01-11 23:50:04 +00:00
Richard Smith 7553d864e1 Very basic support for constant evaluation of expressions. (#3581) 
Form a side table with constant values for each instruction. Evaluation
is only supported for a few very simple kinds of instruction for now.
This is not observable outside of the SemIR output, because nothing
depends on expressions having a constant value phase yet.
 2024-01-11 23:12:58 +00:00