[Bug 98761] [regression][radeonsi][polaris]"radeonsi: set IF_THRESHOLD to 3" breaks Witcher2's ground

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Comment # 20 on bug 98761 from
(In reply to Marek Olšák from comment #19)
> Created attachment 128178 [details]
> still bad
> 
> (In reply to Matt Arsenault from comment #18)
> > Try after llvm r287844
> 
> It's still pretty broken. See the attached asm. "s_mov vcc_hi, m0" looks
> suspicious.

s_mov vcc_hi, m0 is fine and expected. TableGen happens to sort VCC to the
beginning of the SReg_64 register class list, so the scavenger tends to find
VCC first if its available


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