[LLVMdev] Presenting Unsafe Math Flag to Optimizer

Alastair Lynn arplynn at gmail.com
Thu Jan 14 03:09:52 PST 2010


Would this not be a good place to use the new metadata feature? If metadata indicating that a value is OK to have unsafe optimisations done on it is dropped, everything will still work correctly.


On 14 Jan 2010, at 10:01, Duncan Sands wrote:

> Hi Bill,
>> The current implementation of the "allow unsafe math" option is to specify it via the TargetOptions object. However, this prevents the target-independent optimizer from using it. Are there any opinions (ha!) on how this could be achieved in a nice clean manner which doesn't require using the TargetOptions object in the optimizer?
> a flag on each floating point operation, saying whether it does "exact" math or
> not?
> Ciao,
> Duncan.
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