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Tsukasa OI
28203e182f
This commit simplifies floating type handling through
`update_target_reliable_float_cfg` based on several facts:
1. Major changes in behavior normally occurs only
on the major LLVM upgrade.
2. The first release of LLVM 20.x.x is 20.1.0.
Due to the first fact, we can normally ignore minor and patch releases
of LLVM and we can remove obscure variables like `lt_xx_x_x` (still,
there is a case where checking for patch version is required).
The second fact is missed when the minimum LLVM version is raised to
LLVM 20 and one "fixed in LLVM 20" case can be safely removed.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.