[PATCH] [Aarch64] Optimize subtract in shift counts

Richard Kenner kenner@vlsi1.ultra.nyu.edu
Tue Aug 8 12:13:00 GMT 2017


> The pattern will only be matched if the value is positive. More
> specifically if the constant value is 32 (SImode) or 64 (DImode).

I don't mean the constant, but the value subtracted from it.
If that's negative, then we have a shift count larger than the
wordsize.



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