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...so LLVM can't in good >> conscience enable these optimisations by default. >> >> Cheers. >> >> Tim. >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20131218/6b64b9cd/attachment.html>

Thanks for the explanation, Tim! gcc 4.8.1 *does* generate an fma for your code example for an x86 target that supports fma. I'd bet that the HW vendors' compilers do the same, but I don't have any of those installed at the moment to test that theory. So this is a bug in those compilers? Do you know how they justify it? I see section 6.5 "Expressions" in the C standard, and