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Well, yes, they are different operations. And, yes, this needs to be corrected. This wasn’t my point. It’s a given. I was getting at the _declared_ absence of side effects and what promises we make to anyone using the new fneg instruction. Is this a promise we want to make? From: Cameron McInally <cameron.mcinally at nyu.edu> Sent: Wednesday, September 26, 2018 2:30 PM To: Kevin Neal <Kevin.Neal at sas.com> Cc: LLVM Developers Mai...

Do we really want to have fneg be the only instruction with guaranteed no side effects? That just sounds like a gotcha waiting to happen. Or it could result in horrible code depending on the architecture. I’m still leaning towards having both an intrinsic and an instruction, and if they happen to have the same behavior then that’s fine. If fneg is to be a special instruction with extra promises

...llvm-dev] [FPEnv] FNEG instruction EXTERNAL On Wed, Sep 26, 2018 at 2:47 PM Kevin Neal <Kevin.Neal at sas.com<mailto:Kevin.Neal at sas.com>> wrote: Well, yes, they are different operations. And, yes, this needs to be corrected. This wasn’t my point. It’s a given. I was getting at the _declared_ absence of side effects and what promises we make to anyone using the new fneg instruction. Is this a promise we want to make? What are the side effects that you're thinking about? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/piperma...