[llvm-dev] Unexpected dag combine in arm64

[Friedman, Eli via llvm-dev]

On 9/5/2017 4:01 AM, Jon Chesterfield via llvm-dev wrote:
>
>     Hi,
>
>     There are some generic DAGCombine functions which replace an
>     SDNode with a newly created but otherwise equivalent SDNode.
>     Specifically, visit for SINT_TO_FP, UINT_TO_FP, FP_TO_SINT,
>     FP_TO_UINT where the operand is a constant. This unconditionally
>     prevents target specific dag combines from executing for these nodes.
>

If you want to materialize a floating-point constant using an 
integer-to-floating-point conversion, I would suggest using a 
target-specific node rather than a target-independent one.

-Eli

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

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