search for: clearfpmathtag

...hTag) + FPMathTag = DefaultFPMathTag; + if (FPMathTag) + I->setMetadata(LLVMContext::MD_fpmath, FPMathTag); + return I; + } If you want to keep it as only Add, then make FPMathTag = 0 so that you can easily add the default by just calling AddFPMathTag(instr); But I'd add a ClearFPMathTag function for optimisations/inlining. Maybe later. Also, would be good to make sure the instruction is, in fact, a floating point operation. Either via restricting the type or asserting on it. -- cheers, --renato http://systemcall.org/

Here's a revised patch, plus patches showing how fpmath metadata could be turned on in clang and dragonegg (it seemed safest for the moment to condition on -ffast-math rather than on one of the flags implied by -ffast-math). Major changes: - The FPMathOperator class can no longer be used to change math settings, only to read them. Currently it can be queried for accuracy info. I split the

The attached patch is a first attempt at representing "-ffast-math" at the IR level, in fact on individual floating point instructions (fadd, fsub etc). It is done using metadata. We already have a "fpmath" metadata type which can be used to signal that reduced precision is OK for a floating point operation, eg %z = fmul float %x, %y, !fpmath !0 ... !0 = metadata