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Author SHA1 Message Date
James Greenhalgh f0de8d0940 [Arm] Do not lower vmax/vmin to Neon instructions 
On some Arm cores there is a performance penalty when forwarding from an
S register to a D register.  Calculating VMAX in a D register creates
false forwarding hazards, so don't do that unless we're on a core which
specifically asks for it.

Patch by James Greenhalgh

Differential Revision: https://reviews.llvm.org/D75248
 2020-03-10 10:48:48 +00:00