[llvm-commits] [llvm] r67363 - in /llvm/trunk: include/llvm/Target/TargetOptions.h lib/Target/TargetMachine.cpp

[Chris Lattner]

On Mar 19, 2009, at 11:04 PM, Mon Ping Wang wrote:

> Hi Chris,
>
> This is to support FMAs that can generate less precise results
> primarily due to how it handles rounding, e.g., some architecture will
> truncate the result of a*b before adding it to c.

Do we need a new flag just for this, or is unsafe math enough?  Is  
there an application that wants this flag but not unsafe math?

-Chris

>
>
> -- Mon Ping
>
>
> On Mar 19, 2009, at 10:36 PM, Chris Lattner wrote:
>
>>
>> On Mar 19, 2009, at 10:06 PM, Mon P Wang wrote:
>>
>>> Author: wangmp
>>> Date: Fri Mar 20 00:06:58 2009
>>> New Revision: 67363
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=67363&view=rev
>>> Log:
>>> Added option to enable generating less precise mad (multiply
>>> addition)
>>> for those architectures that support the instruction.
>>
>> Hi Mon Ping,
>>
>> Is this specifically to support FMA instructions that elide the
>> rounding step, or is this for "even less precise" FMAs?
>>
>> -Chris
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