featuregood first issuehelp wanted
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描述
@fastmath is currently an all-or-nothing construct: one opts into every available flag (which is subject to change with new LLVM versions) by using this macro. There is no syntax to invoke a specific subset of the available flags.
A syntax for opt-in flags like @fastmath (;reassoc=true,contract=true,nsz=true) EXPR would be welcome for a more controlled @fastmath experience.