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Author SHA1 Message Date
Norbert Lange 6763f40331 zstd_decompress: use a helper function for context create 
Multiple ZSTD_createDCtx* functions call other (public)
ZSTD_createDCtx* functions, this makes it harder for humans
and compilers to throw out code that is not used.

This farms out the logic into a static function, if a program
only uses a single ZSTD_createDCtx variant, all others can be easily
dropped and the remaining implementation can be specialized.
 2021-09-26 14:41:37 +02:00
Norbert Lange 0d45540695 decompress: conditionally remove bmi2 from context 
Use an helper function, which will just return 0 in case
the feature is disabled.
Allows constant propagation and removal of dead code.
 2021-09-26 14:41:37 +02:00
Norbert Lange 02296cac82 decompress: conditionally remove legacy members from context 
Remove the then unneeded variables from the struct,
and all accesses to them.
 2021-09-26 12:12:17 +02:00