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

[Mon Ping Wang]

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.

-- 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
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits