Displaying 2 results from an estimated 2 matches for "f169f6d7".
2013 Dec 20
0
[LLVMdev] Commutability of X86 FMA3 instructions.
...> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20131220/f169f6d7/attachment.html>
2013 Dec 20
2
[LLVMdev] Commutability of X86 FMA3 instructions.
Hi all,
The 213 variant of the FMA3 instructions is currently marked
commutable (see X86InstrFMA.td). Is that safe? According to the ISA
the FMA3 instructions aren't commutable for non-numeric results, so
I'd have thought commuting this would only be valid in fast-math mode?
For the curious, the reason that I'm asking is that we currently
always select the 213 variant, but this