[PATCH] D26855: New unsafe-fp-math implementation for X86 target

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In https://reviews.llvm.org/D26855#657287, @avt77 wrote:

> Hi All, 
>  I found a really "stress" test for div operations (see the attachment)F3025626: spill_fdiv.ll <https://reviews.llvm.org/F3025626> (tnx to Sanjay Patel). The test shows maybe the worst case of the possible degradation because of this patch. I used the following command with 2 different compilers:
>
> .......
>
> For "pure" trunk compiler I got:   Elapsed time 2 s.
>  For compiler with patch I got:      Elapsed time 18 s.


Do you have any profiling info on where the time is going please? @Gerolf might then be able to advise whether we can improve the MCCombiner mechanism before/after this patch has gone in.


https://reviews.llvm.org/D26855