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Matt Arsenault d7ab2ec610 DAG: Add new control for ISD::FMAD formation
For AMDGPU this depends on whether denormals are enabled in the
default FP mode for the function. Currently this is treated as a
subtarget feature, so FMAD is selectively legal based on that. I want
to move this out of the subtarget features so this can be controlled
with a denormal mode attribute. Additionally, this will allow folding
based on a future ftz fast math flag.
2019-10-31 07:51:38 -07:00
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