[Patch] [Aarch64] PR rtl-optimization/87763 - this patch fixes gcc.target/aarch64/lsl_asr_sbfiz.c

Segher Boessenkool segher@kernel.crashing.org
Sat Apr 27 00:47:00 GMT 2019


On Fri, Apr 26, 2019 at 11:30:47PM +0100, Richard Earnshaw (lists) wrote:
> A subreg on a reg is fine (which is what we'd have in this specific
> case).  It's when the subreg gets left on something else (other than a
> mem) when the problems start.

Yeah.  We typically push the subregs as far inward as we can.  I have a
patch for one case where we explicitly pull a subreg to the left instead,
and that destroys all of rs6000's insert patterns :-/


Segher



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