Re: [PATCH][combine] Don't create LSHIFTRT of zero bits in change_zero_ext

[Bernd Schmidt]

On 12/10/2015 03:36 PM, Kyrill Tkachov wrote:
I'm okay with delaying this for next stage 1 if people prefer, though I
think it's
pretty low risk.

I think this is something we should fix now.

+         x = XEXP (x, 0);
+         if (start > 0)
+           x = gen_rtx_LSHIFTRT (mode, x, GEN_INT (start));

I think this should just use simplify_shift_const. gen_rtx_FOO should be 
avoided.


Bernd