you are really saying that to get back previous behavior, one needs to
-fp_accuracy=not_relaxed or something to that effect? I don't follow
your message.
Sun

On Wed, Apr 27, 2011 at 6:37 PM, Ramanarayanan, Ramshankar
<ramshankar.ramanaraya...@amd.com> wrote:
> Could a gate keeper approve this patch?
>
>
>
> This update enhances performance of the compiled code on X8664 when using
> the O3 flag. Improvements come mainly from relaxing the floating point
> accuracy setting at O3. This enables a wide range of optimizations including
> loop nest optimizations and associative redundancy elimination
> optimizations. Given this change, users will need to use
> –fp-accuracy=relaxed flag in addition to –O3 if they require the earlier
> floating point precision. During subsequent tuning we found that the bad
> reference bias heuristic affects the computed cache costs and leads to
> incorrect choice of inner loops and is thus ignored.
>
>
>
> Following tests have been conducted with this change.
>
>
>
> 1: No compiler time failure for x86 build
>
> 2: SPEC CPU 2006 validated with AMD flags and with O3 flag
>
> 3: The gcc regression suite has no new failures on x86/Linux
>
>
>
> Best regards,
>
> Ram
>
>
>
> Ramshankar Ramanarayanan
>
> Member of Technical Staff
>
> Open Source Compiler Engineering
>
> Advanced Micro Devices, Bangalore
>
>
>
>
>
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