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..., and should not be part of any discussion related to > fusion rules. It is defined to be identical to the separate fmul and fadd > > -Matt > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190710/8ad011cb/attachment.html>

There is no way to disable FMAs with 'fast' ops in LLVM. I would like to propose that LLVM's -fp-contract=off should disable fusion, regardless of any other flags since the Clang option suggests this to be the case: $ clang --help | grep fp-contract -ffp-contract=<value> Form fused FP ops (e.g. FMAs): fast (everywhere) | on (according to FP_CONTRACT pragma, default) | off