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2018-02-08 17:34 GMT-08:00 Quentin Colombet via llvm-dev < llvm-dev at lists.llvm.org>: > Hi, > > TL;DR > r317488 changed the way fast math flags are laid out in the bitcode and > anyone compiling a pre-llvm-6.0 bitcode with llvm-6.0 will lose all the > optimizations guarded by isFast and a pre-llvm-6.0 compiler compiling a > llvm-6.0 bitcode will potentially generate

Hi, TL;DR r317488 changed the way fast math flags are laid out in the bitcode and anyone compiling a pre-llvm-6.0 bitcode with llvm-6.0 will lose all the optimizations guarded by isFast and a pre-llvm-6.0 compiler compiling a llvm-6.0 bitcode will potentially generate incorrect code w.r.t. fast math expectations. Should we bump the bitcode version because of that and have the autoupgrader